Students from Architecture and Landscaping MS course visited ALC campus to learn names of the plants in our gardens and their uses. On 10/8/18, Dr.T.Rose Mary enlightened the students about the plants & their uses.
Good evening Madam, This is Shaik.Parveen from NB-31. We had also participated as our seniors in our 1st year.We are exuberant in such works to do so...Thank you Madam.
I am G. VICTOR PAUL AB-19 Define embrology. Name the imminent Indian embryologists. Ans. Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryoes and fetuses. The imminent Indian embryologist is Panchanan Maheswari.
2. What is tapetum? Ans. Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3. What is Endothecium? Ans. Endothecium is the layer of cells present inner to epidermis in anther wall.
4. What is Microspore ? Ans. Microspore is the pollen grain of seed plant.
5. What is Palynology? Ans. Palynology is the study of external morphology of pollen grains and spores .
6. What is Megasporangium ? Mention the types. Ans. The formation of four haploid megaspores from megaspore mother cell through meiosis. The types are : 1. Linear 2. T-shaped 3. Inverted T-shaped 4. Isobilateral
7. Define Monosporic, Bisporic, Tetrasporic. Ans. Monosporic: The embryo sac which is derived from only one of the four megaspores. All the nuclei in such embryo sac are genetically identical, because they are derived through mitoses of a single nucleus. Bisporic: The first meiotic division in megaspore mother cell results in two dyad cells. Only one of the dyad cells undergoes the second meiotic division, but no wall formation occurs. So the resulting two megaspore nuclei contribute in the formation of embryo sac. Tetrasporic: All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryo sac. In this type there is no wall foramtion.
8. Define fertilization. Who coined the term syngamy. Ans. The fusion of male gamete with the female gamete is known as fertilization. Syngamy term was coined by Stras burger(1884).
9. Define Double fertilization and Triple fusion. Ans. In angiosperms, the two main gametes relased in to the embryo sac take part in fertilization. One of the sperm fuses with the egg nucleus resulting in a zygote. The other male gamete fuses with the secondary nucleus forming primary endosperm nucleus. This is known as double fertilization. Triple fusion: The union of one male nucleus with secondary nucleus is known as triple fusion. As it involves the union of three nuclei the resultant is called primary endosperm nucleus.
10. What is Endosperm and its types? Ans. Endosprerm is most common nutritive tissue for the developing embryos in angiosperms. There are three types: 1. Nuclear Endosperm 2. Cellular Endosperm 3. Helobial Endosperm
11. What is Ruminate Endosperm? Ans. Mature endosperm with some degree of irregularity and unevenness in its surface contour is called Ruminate endosperm.
12. What is Helobial Endosperm? Ans. The primary endosperm nucleus moves towards the chalazal end of the embryo sac. Here it divides to form a large micropylar chamber and a small chalazal chamber.
13. Difference between dicot and monocot embryos. Ans. Dicot: There are two cotyledons attached to embryonal axis. Coleoptile is absent. Scutellum is absent. Monocot: Only one cotyledon attached to the embryonal axis. The envolpe of plumule is called coleoptile. Scutellum is present.
14. What is Scutellum? Ans. The single cotyledon of a monocot embryo is known as Scutellum
Iam G. VICTOR PAUL AB-19 15. What is Polyembryony ? Ans:The occurence of more than one embryo in a seed is known as polyembryony.
16. Mention the objectives of polyembyrony. Ans:1. cleavage of the embryo. 2. formation of embryosacs form other cells of the embryosacs. 3. for the development of one than one embryosac within the same ovule.
Iam B. FINNY NB-15.Define embrology. Name the imminent Indian embryologists. Ans. Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryoes and fetuses. The imminent Indian embryologist is Panchanan Maheswari.
2. What is tapetum? Ans. Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3. What is Endothecium? Ans. Endothecium is the layer of cells present inner to epidermis in anther wall.
4. What is Microspore ? Ans. Microspore is the pollen grain of seed plant.
5. What is Palynology? Ans. Palynology is the study of external morphology of pollen grains and spores .
6. What is Megasporangium ? Mention the types. Ans. The formation of four haploid megaspores from megaspore mother cell through meiosis. The types are : 1. Linear 2. T-shaped 3. Inverted T-shaped 4. Isobilateral
7. Define Monosporic, Bisporic, Tetrasporic. Ans. Monosporic: The embryo sac which is derived from only one of the four megaspores. All the nuclei in such embryo sac are genetically identical, because they are derived through mitoses of a single nucleus. Bisporic: The first meiotic division in megaspore mother cell results in two dyad cells. Only one of the dyad cells undergoes the second meiotic division, but no wall formation occurs. So the resulting two megaspore nuclei contribute in the formation of embryo sac. Tetrasporic: All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryo sac. In this type there is no wall foramtion.
8. Define fertilization. Who coined the term syngamy. Ans. The fusion of male gamete with the female gamete is known as fertilization. Syngamy term was coined by Stras burger(1884).
9. Define Double fertilization and Triple fusion. Ans. In angiosperms, the two main gametes relased in to the embryo sac take part in fertilization. One of the sperm fuses with the egg nucleus resulting in a zygote. The other male gamete fuses with the secondary nucleus forming primary endosperm nucleus. This is known as double fertilization. Triple fusion: The union of one male nucleus with secondary nucleus is known as triple fusion. As it involves the union of three nuclei the resultant is called primary endosperm nucleus.
10. What is Endosperm and its types? Ans. Endosprerm is most common nutritive tissue for the developing embryos in angiosperms. There are three types: 1. Nuclear Endosperm 2. Cellular Endosperm 3. Helobial Endosperm
11. What is Ruminate Endosperm? Ans. Mature endosperm with some degree of irregularity and unevenness in its surface contour is called Ruminate endosperm.
12. What is Helobial Endosperm? Ans. The primary endosperm nucleus moves towards the chalazal end of the embryo sac. Here it divides to form a large micropylar chamber and a small chalazal chamber.
13. Difference between dicot and monocot embryos. Ans. Dicot: There are two cotyledons attached to embryonal axis. Coleoptile is absent. Scutellum is absent. Monocot: Only one cotyledon attached to the embryonal axis. The envolpe of plumule is called coleoptile. Scutellum is present.
14. What is Scutellum? Ans. The single cotyledon of a monocot embryo is known as Scutell
Iam B. FINNY NB-1515. What is Polyembryony ? Ans:The occurence of more than one embryo in a seed is known as polyembryony.
16. Mention the objectives of polyembyrony. Ans:1. cleavage of the embryo. 2. formation of embryosacs form other cells of the embryosacs. 3. for the development of one than one embryosac within the same ovule
Iam G.VICTOR PAUL NB-19 Define embrology. Name the imminent Indian embryologists. Ans. Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryoes and fetuses. The imminent Indian embryologist is Panchanan Maheswari.
2. What is tapetum? Ans. Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3. What is Endothecium? Ans. Endothecium is the layer of cells present inner to epidermis in anther wall.
4. What is Microspore ? Ans. Microspore is the pollen grain of seed plant.
5. What is Palynology? Ans. Palynology is the study of external morphology of pollen grains and spores .
6. What is Megasporangium ? Mention the types. Ans. The formation of four haploid megaspores from megaspore mother cell through meiosis. The types are : 1. Linear 2. T-shaped 3. Inverted T-shaped 4. Isobilateral
7. Define Monosporic, Bisporic, Tetrasporic. Ans. Monosporic: The embryo sac which is derived from only one of the four megaspores. All the nuclei in such embryo sac are genetically identical, because they are derived through mitoses of a single nucleus. Bisporic: The first meiotic division in megaspore mother cell results in two dyad cells. Only one of the dyad cells undergoes the second meiotic division, but no wall formation occurs. So the resulting two megaspore nuclei contribute in the formation of embryo sac. Tetrasporic: All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryo sac. In this type there is no wall foramtion.
8. Define fertilization. Who coined the term syngamy. Ans. The fusion of male gamete with the female gamete is known as fertilization. Syngamy term was coined by Stras burger(1884).
9. Define Double fertilization and Triple fusion. Ans. In angiosperms, the two main gametes relased in to the embryo sac take part in fertilization. One of the sperm fuses with the egg nucleus resulting in a zygote. The other male gamete fuses with the secondary nucleus forming primary endosperm nucleus. This is known as double fertilization. Triple fusion: The union of one male nucleus with secondary nucleus is known as triple fusion. As it involves the union of three nuclei the resultant is called primary endosperm nucleus.
10. What is Endosperm and its types? Ans. Endosprerm is most common nutritive tissue for the developing embryos in angiosperms. There are three types: 1. Nuclear Endosperm 2. Cellular Endosperm 3. Helobial Endosperm
11. What is Ruminate Endosperm? Ans. Mature endosperm with some degree of irregularity and unevenness in its surface contour is called Ruminate endosperm.
12. What is Helobial Endosperm? Ans. The primary endosperm nucleus moves towards the chalazal end of the embryo sac. Here it divides to form a large micropylar chamber and a small chalazal chamber.
13. Difference between dicot and monocot embryos. Ans. Dicot: There are two cotyledons attached to embryonal axis. Coleoptile is absent. Scutellum is absent. Monocot: Only one cotyledon attached to the embryonal axis. The envolpe of plumule is called coleoptile. Scutellum is present.
14. What is Scutellum? Ans. The single cotyledon of a monocot embryo is known as Scutellum
Iam G.VICTOR PAUL NB-19 15. What is Polyembryony ? Ans:The occurence of more than one embryo in a seed is known as polyembryony.
16. Mention the objectives of polyembyrony. Ans:1. cleavage of the embryo. 2. formation of embryosacs form other cells of the embryosacs. 3. for the development of one than one embryosac within the same ovule.
Hi Madam, This is J.Sowjanya from NB section,Regd No.172408.
1.Define Embryology.Name the imminant Indian embryologist. Ans:It is the branch of biology that deals with the "Stdy of embryos" but in general terms,it include the sex organ development,male and female gamates formation,fertilization,endosperm and emryo formation.The imminant Indian embryologist is Panchanan Maheswari.
2.Define Tapetum. Ans:Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3.Define Endothecium. Ans:It is remarkably identified by their radially elongated structure.It is rarely multilayered and it produces "Fibrous bands" which helps in time of anther dehiscence.
4.Define Microspore. Ans:It is formed by microsporogenesis and is responsible for the development of male gametophyte.These are the results of meiosis and usually smaller in size.
5.What is Palynology? Ans:Palynology is the study of external morphology of pollen grains and spores.
6.What is Megaspoangium?Mension the types. Ans:The formation of four haploid megaspores from megaspore mother cell through meiosis. The types are, 1.Linear. 2.T-Shaped. 3.Inverted T-Shaped. 4.Isobilateral.
7.Define Monosporic,Bisporic,Tetrasporic. Ans:Monosporic:The embryosac which is derived from only one of the four megaspores.All the nuclei in such embryosac are generally identical,because they are derived through mitosis of a single nucleus. Bisporic:The first meiotic division in megaspore mither cell results in two dyad cells.Only one of the dyed cells undergoes the second meiotic division,but no wall formation occurs.So the resulting two microspore nuclei contribute in the formation of the embryosac. Tetrasporic:All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryosac.In this type,there is no wall formation.
8.Define Fertilization.Who coined the term Syngamy? Ans:The fusion of male gamate with the female gamate is known as fertilization.Syngamy term was ciined by Stras burger(1884).
9.Define Double fertilization and Triple fusion. Ans:Double fertilization:In angiosperms,the two main gamates released into the embryosac,take part in fertilization.One of the sperm fuses with the egg nucleus resulting in a zygote.The other male gamate fuses with the secondary nucleus forming primary endosperm nucleus. Triple fusion:The union of one male nucleus with secondary nucleus is known as Triple fusion.As it involves the union of three nuclei,the resultant is called primary endosperm nucleus.
10.Define Endospem and Mension it's types. Ans:The endosperms are very vital parts of the fertilized embryo.An endosperm forms the surrounding tissue of the growing embryo.The primary endosperm nucleus divides repeatedly.It forms polyploidy nutritive tissue called endosperm.These are of 3 types. They are, 1.Nuclear Endosperm. 2.cellular Endosperm. 3.Helobial Endosperm. There is a special type of endosperm called as Ruminate endosperm.
11.What is Ruminate Endisperm? Ans:Maturity endosperm with some degree of irregularity and unevenness in it's surface counter is called Ruminate endosperm.
Hi Madam,this is J.Sowjanya from NB Section,Regd No.172408.
12.What is Helobial Endosperm? Ans:The primary endosperm nucleus moves towards the chalazal end of the embryo sac.Here it divides to form a large mycropylar chamber and a small chalazal chamber.
13.Mension the differences between Dicot and Monocot embryo. Ans:Dicot embryo:An embryo with 2 cotyledons and plumule is distal. Coleoptile,Coleorhiza are absent and Scutellum is also absent. Monocot embryo: An embryo with 1 cotyledon and plumule is lateral.coleoptile,coleorhiza are present and Scutellum is also present.
14.Define Scutellum. Ans:It is the charecteristic feature of monocot only.The monocot consists of a large and sheild shaped cotyledon known as "Scutellum".
15.Define Polyembryony. Ans:The formation of more than one embryo from a single fertilized ovum or in a single seed.
16.Mension the objectives of the "Polyembryony". Ans:Objectives of Polyembryony: 1.To determine whether Polyembryony confers a competitive advantage to V.rossicum. 2.Assess whether this advantage,if present,is more pronounced in intra or inter specific competition. 3.To determine whether the competitive advantage,is present,is proportional to the number of embryos per seed.
good morning madam
ReplyDeleteGood evening Madam,
ReplyDeleteThis is Shaik.Parveen from NB-31.
We had also participated as our seniors in our 1st year.We are exuberant in such works to do so...Thank you Madam.
DEAR PRAVEEN,
ReplyDeleteGOOD. DO MORE INNOVATIVE WORKS.
I am G. VICTOR PAUL
ReplyDeleteAB-19
Define embrology. Name the imminent Indian embryologists.
Ans. Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryoes and fetuses. The imminent Indian embryologist is Panchanan Maheswari.
2. What is tapetum?
Ans. Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3. What is Endothecium?
Ans. Endothecium is the layer of cells present inner to epidermis in anther wall.
4. What is Microspore ?
Ans. Microspore is the pollen grain of seed plant.
5. What is Palynology?
Ans. Palynology is the study of external morphology of pollen grains and spores .
6. What is Megasporangium ? Mention the types.
Ans. The formation of four haploid megaspores from megaspore mother cell through meiosis.
The types are :
1. Linear
2. T-shaped
3. Inverted T-shaped
4. Isobilateral
7. Define Monosporic, Bisporic, Tetrasporic.
Ans. Monosporic: The embryo sac which is derived from only one of the four megaspores. All the nuclei in such embryo sac are genetically identical, because they are derived through mitoses of a single nucleus.
Bisporic: The first meiotic division in megaspore mother cell results in two dyad cells. Only one of the dyad cells undergoes the second meiotic division, but no wall formation occurs. So the resulting two megaspore nuclei contribute in the formation of embryo sac.
Tetrasporic: All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryo sac. In this type there is no wall foramtion.
8. Define fertilization. Who coined the term syngamy.
Ans. The fusion of male gamete with the female gamete is known as fertilization. Syngamy term was coined by Stras burger(1884).
9. Define Double fertilization and Triple fusion.
Ans. In angiosperms, the two main gametes relased in to the embryo sac take part in fertilization. One of the sperm fuses with the egg nucleus resulting in a zygote. The other male gamete fuses with the secondary nucleus forming primary endosperm nucleus. This is known as double fertilization.
Triple fusion: The union of one male nucleus with secondary nucleus is known as triple fusion. As it involves the union of three nuclei the resultant is called primary endosperm nucleus.
10. What is Endosperm and its types?
Ans. Endosprerm is most common nutritive tissue for the developing embryos in angiosperms.
There are three types:
1. Nuclear Endosperm
2. Cellular Endosperm
3. Helobial Endosperm
11. What is Ruminate Endosperm?
Ans. Mature endosperm with some degree of irregularity and unevenness in its surface contour is called Ruminate endosperm.
12. What is Helobial Endosperm?
Ans. The primary endosperm nucleus moves towards the chalazal end of the embryo sac. Here it divides to form a large micropylar chamber and a small chalazal chamber.
13. Difference between dicot and monocot embryos.
Ans. Dicot: There are two cotyledons attached to embryonal axis. Coleoptile is absent. Scutellum is absent.
Monocot: Only one cotyledon attached to the embryonal axis. The envolpe of plumule is called coleoptile. Scutellum is present.
14. What is Scutellum?
Ans. The single cotyledon of a monocot embryo is known as Scutellum
Iam G. VICTOR PAUL
ReplyDeleteAB-19
15. What is Polyembryony ?
Ans:The occurence of more than one embryo in a seed is known as polyembryony.
16. Mention the objectives of polyembyrony.
Ans:1. cleavage of the embryo.
2. formation of embryosacs form other cells of the embryosacs.
3. for the development of one than one embryosac within the same ovule.
Iam B. FINNY
ReplyDeleteNB-15.Define embrology. Name the imminent Indian embryologists.
Ans. Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryoes and fetuses. The imminent Indian embryologist is Panchanan Maheswari.
2. What is tapetum?
Ans. Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3. What is Endothecium?
Ans. Endothecium is the layer of cells present inner to epidermis in anther wall.
4. What is Microspore ?
Ans. Microspore is the pollen grain of seed plant.
5. What is Palynology?
Ans. Palynology is the study of external morphology of pollen grains and spores .
6. What is Megasporangium ? Mention the types.
Ans. The formation of four haploid megaspores from megaspore mother cell through meiosis.
The types are :
1. Linear
2. T-shaped
3. Inverted T-shaped
4. Isobilateral
7. Define Monosporic, Bisporic, Tetrasporic.
Ans. Monosporic: The embryo sac which is derived from only one of the four megaspores. All the nuclei in such embryo sac are genetically identical, because they are derived through mitoses of a single nucleus.
Bisporic: The first meiotic division in megaspore mother cell results in two dyad cells. Only one of the dyad cells undergoes the second meiotic division, but no wall formation occurs. So the resulting two megaspore nuclei contribute in the formation of embryo sac.
Tetrasporic: All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryo sac. In this type there is no wall foramtion.
8. Define fertilization. Who coined the term syngamy.
Ans. The fusion of male gamete with the female gamete is known as fertilization. Syngamy term was coined by Stras burger(1884).
9. Define Double fertilization and Triple fusion.
Ans. In angiosperms, the two main gametes relased in to the embryo sac take part in fertilization. One of the sperm fuses with the egg nucleus resulting in a zygote. The other male gamete fuses with the secondary nucleus forming primary endosperm nucleus. This is known as double fertilization.
Triple fusion: The union of one male nucleus with secondary nucleus is known as triple fusion. As it involves the union of three nuclei the resultant is called primary endosperm nucleus.
10. What is Endosperm and its types?
Ans. Endosprerm is most common nutritive tissue for the developing embryos in angiosperms.
There are three types:
1. Nuclear Endosperm
2. Cellular Endosperm
3. Helobial Endosperm
11. What is Ruminate Endosperm?
Ans. Mature endosperm with some degree of irregularity and unevenness in its surface contour is called Ruminate endosperm.
12. What is Helobial Endosperm?
Ans. The primary endosperm nucleus moves towards the chalazal end of the embryo sac. Here it divides to form a large micropylar chamber and a small chalazal chamber.
13. Difference between dicot and monocot embryos.
Ans. Dicot: There are two cotyledons attached to embryonal axis. Coleoptile is absent. Scutellum is absent.
Monocot: Only one cotyledon attached to the embryonal axis. The envolpe of plumule is called coleoptile. Scutellum is present.
14. What is Scutellum?
Ans. The single cotyledon of a monocot embryo is known as Scutell
Iam B. FINNY
ReplyDeleteNB-1515. What is Polyembryony ?
Ans:The occurence of more than one embryo in a seed is known as polyembryony.
16. Mention the objectives of polyembyrony.
Ans:1. cleavage of the embryo.
2. formation of embryosacs form other cells of the embryosacs.
3. for the development of one than one embryosac within the same ovule
Iam G.VICTOR PAUL
ReplyDeleteNB-19
Define embrology. Name the imminent Indian embryologists.
Ans. Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryoes and fetuses. The imminent Indian embryologist is Panchanan Maheswari.
2. What is tapetum?
Ans. Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3. What is Endothecium?
Ans. Endothecium is the layer of cells present inner to epidermis in anther wall.
4. What is Microspore ?
Ans. Microspore is the pollen grain of seed plant.
5. What is Palynology?
Ans. Palynology is the study of external morphology of pollen grains and spores .
6. What is Megasporangium ? Mention the types.
Ans. The formation of four haploid megaspores from megaspore mother cell through meiosis.
The types are :
1. Linear
2. T-shaped
3. Inverted T-shaped
4. Isobilateral
7. Define Monosporic, Bisporic, Tetrasporic.
Ans. Monosporic: The embryo sac which is derived from only one of the four megaspores. All the nuclei in such embryo sac are genetically identical, because they are derived through mitoses of a single nucleus.
Bisporic: The first meiotic division in megaspore mother cell results in two dyad cells. Only one of the dyad cells undergoes the second meiotic division, but no wall formation occurs. So the resulting two megaspore nuclei contribute in the formation of embryo sac.
Tetrasporic: All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryo sac. In this type there is no wall foramtion.
8. Define fertilization. Who coined the term syngamy.
Ans. The fusion of male gamete with the female gamete is known as fertilization. Syngamy term was coined by Stras burger(1884).
9. Define Double fertilization and Triple fusion.
Ans. In angiosperms, the two main gametes relased in to the embryo sac take part in fertilization. One of the sperm fuses with the egg nucleus resulting in a zygote. The other male gamete fuses with the secondary nucleus forming primary endosperm nucleus. This is known as double fertilization.
Triple fusion: The union of one male nucleus with secondary nucleus is known as triple fusion. As it involves the union of three nuclei the resultant is called primary endosperm nucleus.
10. What is Endosperm and its types?
Ans. Endosprerm is most common nutritive tissue for the developing embryos in angiosperms.
There are three types:
1. Nuclear Endosperm
2. Cellular Endosperm
3. Helobial Endosperm
11. What is Ruminate Endosperm?
Ans. Mature endosperm with some degree of irregularity and unevenness in its surface contour is called Ruminate endosperm.
12. What is Helobial Endosperm?
Ans. The primary endosperm nucleus moves towards the chalazal end of the embryo sac. Here it divides to form a large micropylar chamber and a small chalazal chamber.
13. Difference between dicot and monocot embryos.
Ans. Dicot: There are two cotyledons attached to embryonal axis. Coleoptile is absent. Scutellum is absent.
Monocot: Only one cotyledon attached to the embryonal axis. The envolpe of plumule is called coleoptile. Scutellum is present.
14. What is Scutellum?
Ans. The single cotyledon of a monocot embryo is known as Scutellum
Iam G.VICTOR PAUL
ReplyDeleteNB-19
15. What is Polyembryony ?
Ans:The occurence of more than one embryo in a seed is known as polyembryony.
16. Mention the objectives of polyembyrony.
Ans:1. cleavage of the embryo.
2. formation of embryosacs form other cells of the embryosacs.
3. for the development of one than one embryosac within the same ovule.
Hi Madam,
ReplyDeleteThis is J.Sowjanya from NB section,Regd No.172408.
1.Define Embryology.Name the imminant Indian embryologist.
Ans:It is the branch of biology that deals with the "Stdy of embryos" but in general terms,it include the sex organ development,male and female gamates formation,fertilization,endosperm and emryo formation.The imminant Indian embryologist is Panchanan Maheswari.
2.Define Tapetum.
Ans:Tapetum is the inner most layer of anther wall and completely surrounds the sporogenous tissue.
3.Define Endothecium.
Ans:It is remarkably identified by their radially elongated structure.It is rarely multilayered and it produces "Fibrous bands" which helps in time of anther dehiscence.
4.Define Microspore.
Ans:It is formed by microsporogenesis and is responsible for the development of male gametophyte.These are the results of meiosis and usually smaller in size.
5.What is Palynology?
Ans:Palynology is the study of external morphology of pollen grains and spores.
6.What is Megaspoangium?Mension the types.
Ans:The formation of four haploid megaspores from megaspore mother cell through meiosis.
The types are,
1.Linear.
2.T-Shaped.
3.Inverted T-Shaped.
4.Isobilateral.
7.Define Monosporic,Bisporic,Tetrasporic.
Ans:Monosporic:The embryosac which is derived from only one of the four megaspores.All the nuclei in such embryosac are generally identical,because they are derived through mitosis of a single nucleus.
Bisporic:The first meiotic division in megaspore mither cell results in two dyad cells.Only one of the dyed cells undergoes the second meiotic division,but no wall formation occurs.So the resulting two microspore nuclei contribute in the formation of the embryosac.
Tetrasporic:All the four nuclei of the coenomegaspore take part in the formation of tetrasporic embryosac.In this type,there is no wall formation.
8.Define Fertilization.Who coined the term Syngamy?
Ans:The fusion of male gamate with the female gamate is known as fertilization.Syngamy term was ciined by Stras burger(1884).
9.Define Double fertilization and Triple fusion.
Ans:Double fertilization:In angiosperms,the two main gamates released into the embryosac,take part in fertilization.One of the sperm fuses with the egg nucleus resulting in a zygote.The other male gamate fuses with the secondary nucleus forming primary endosperm nucleus.
Triple fusion:The union of one male nucleus with secondary nucleus is known as Triple fusion.As it involves the union of three nuclei,the resultant is called primary endosperm nucleus.
10.Define Endospem and Mension it's types.
Ans:The endosperms are very vital parts of the fertilized embryo.An endosperm forms the surrounding tissue of the growing embryo.The primary endosperm nucleus divides repeatedly.It forms polyploidy nutritive tissue called endosperm.These are of 3 types.
They are,
1.Nuclear Endosperm.
2.cellular Endosperm.
3.Helobial Endosperm.
There is a special type of endosperm called as Ruminate endosperm.
11.What is Ruminate Endisperm?
Ans:Maturity endosperm with some degree of irregularity and unevenness in it's surface counter is called Ruminate endosperm.
Hi Madam,this is J.Sowjanya from NB Section,Regd No.172408.
ReplyDelete12.What is Helobial Endosperm?
Ans:The primary endosperm nucleus moves towards the chalazal end of the embryo sac.Here it divides to form a large mycropylar chamber and a small chalazal chamber.
13.Mension the differences between Dicot and Monocot embryo.
Ans:Dicot embryo:An embryo with 2 cotyledons and plumule is distal. Coleoptile,Coleorhiza are absent and Scutellum is also absent.
Monocot embryo: An embryo with 1 cotyledon and plumule is lateral.coleoptile,coleorhiza are present and Scutellum is also present.
14.Define Scutellum.
Ans:It is the charecteristic feature of monocot only.The monocot consists of a large and sheild shaped cotyledon known as "Scutellum".
15.Define Polyembryony.
Ans:The formation of more than one embryo from a single fertilized ovum or in a single seed.
16.Mension the objectives of the "Polyembryony".
Ans:Objectives of Polyembryony:
1.To determine whether Polyembryony confers a competitive advantage to V.rossicum.
2.Assess whether this advantage,if present,is more pronounced in intra or inter specific competition.
3.To determine whether the competitive advantage,is present,is proportional to the number of embryos per seed.
THANK YOU MADAM.