262594
In a flowering plant, archesporium gives rise to
1 Wall and tapetum
2 Only tapetum and sporogenous cells
3 Only wall of the sporangium
4 Both wall and sporogenous cells
Explanation:
In a flowering plant, archesporium gives rise to both wall and sprogenous cells. Archesporial cells present in a sporophyte that gives rise to spores after division. The division in archesporium leads to the formation of the anther wall and sporogenous cell. Then sporogenous cell will form microspore mother cell microspore mother cell after division give rise to microspore or male gamete.
MGIMS Wardha-2010
Sexual Reproduction in Flowering Plants
262576
Generally archesporium in an ovule is
1 single celled and hypodermal in origin
2 single celled and lies in the centre of the ovule
3 single celled and terminal in origin
4 many celled and lie in the centre
Explanation:
Generally archesporium in an ovule is single celled and hypodermal in origin. A group of cell from which a spore mother cell developed is called archesporium. The archesporial cells functions directly as a megaspore mother cell in the tenuinucellate ovules whereas it divides to form an outer parietal cell and inner primary sporogenous cell in the crassinucellate ovule.
CG PMT-2007 / CPMT-1980
Sexual Reproduction in Flowering Plants
262561
One of the most resistant known biological material is
1 lignin
2 hemicellulose
3 sporopollenin
4 ugnocellulose
Explanation:
One of the most resistant known biological material is sporopollenin. It is very stable and chemically inert. It is present in exine of pollen grains. Pollen grains have two layer of outer wall, one is intine and second is exine. It is resistant to enzymes and strong chemicals and even does not decompose in soil after hundred of years. Due to sporopollenin, pollen grains are found in fossils of hundreds of years old.
2001
Sexual Reproduction in Flowering Plants
262537
When pollen grain is shed at 3-celled stage, name the cells is contains.
1 1 vegetative cell and 2 male gametes
2 2 vegetative cells and 1 male gamete
3 2 generative cells and 1 male gamete
4 2 male gametes and 1 generative cell
Explanation:
A pollen grain with pollen tube carrying male gametes represent mature male gametophyte. Generative cell divides forming two male gametes and hence at 3 celled stage the pollen grain contain two male gametes and one negative cell.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262540
Fibrous thickenings of hygroscopic nature are found in this part of the anther wall:
1 Epidermis
2 Endothecium
3 Middle layers
4 Tapetum
Explanation:
Endothecium is an unilayer or radially elongated cell occurs in between the epidermis and middle layer of an angiospermic anther sac wall. Cell of endothecium cells possess a fibrous thickening in their cell wall that makes them hygroscopic, there by aiding in the dehydration of mature anther.
262594
In a flowering plant, archesporium gives rise to
1 Wall and tapetum
2 Only tapetum and sporogenous cells
3 Only wall of the sporangium
4 Both wall and sporogenous cells
Explanation:
In a flowering plant, archesporium gives rise to both wall and sprogenous cells. Archesporial cells present in a sporophyte that gives rise to spores after division. The division in archesporium leads to the formation of the anther wall and sporogenous cell. Then sporogenous cell will form microspore mother cell microspore mother cell after division give rise to microspore or male gamete.
MGIMS Wardha-2010
Sexual Reproduction in Flowering Plants
262576
Generally archesporium in an ovule is
1 single celled and hypodermal in origin
2 single celled and lies in the centre of the ovule
3 single celled and terminal in origin
4 many celled and lie in the centre
Explanation:
Generally archesporium in an ovule is single celled and hypodermal in origin. A group of cell from which a spore mother cell developed is called archesporium. The archesporial cells functions directly as a megaspore mother cell in the tenuinucellate ovules whereas it divides to form an outer parietal cell and inner primary sporogenous cell in the crassinucellate ovule.
CG PMT-2007 / CPMT-1980
Sexual Reproduction in Flowering Plants
262561
One of the most resistant known biological material is
1 lignin
2 hemicellulose
3 sporopollenin
4 ugnocellulose
Explanation:
One of the most resistant known biological material is sporopollenin. It is very stable and chemically inert. It is present in exine of pollen grains. Pollen grains have two layer of outer wall, one is intine and second is exine. It is resistant to enzymes and strong chemicals and even does not decompose in soil after hundred of years. Due to sporopollenin, pollen grains are found in fossils of hundreds of years old.
2001
Sexual Reproduction in Flowering Plants
262537
When pollen grain is shed at 3-celled stage, name the cells is contains.
1 1 vegetative cell and 2 male gametes
2 2 vegetative cells and 1 male gamete
3 2 generative cells and 1 male gamete
4 2 male gametes and 1 generative cell
Explanation:
A pollen grain with pollen tube carrying male gametes represent mature male gametophyte. Generative cell divides forming two male gametes and hence at 3 celled stage the pollen grain contain two male gametes and one negative cell.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262540
Fibrous thickenings of hygroscopic nature are found in this part of the anther wall:
1 Epidermis
2 Endothecium
3 Middle layers
4 Tapetum
Explanation:
Endothecium is an unilayer or radially elongated cell occurs in between the epidermis and middle layer of an angiospermic anther sac wall. Cell of endothecium cells possess a fibrous thickening in their cell wall that makes them hygroscopic, there by aiding in the dehydration of mature anther.
262594
In a flowering plant, archesporium gives rise to
1 Wall and tapetum
2 Only tapetum and sporogenous cells
3 Only wall of the sporangium
4 Both wall and sporogenous cells
Explanation:
In a flowering plant, archesporium gives rise to both wall and sprogenous cells. Archesporial cells present in a sporophyte that gives rise to spores after division. The division in archesporium leads to the formation of the anther wall and sporogenous cell. Then sporogenous cell will form microspore mother cell microspore mother cell after division give rise to microspore or male gamete.
MGIMS Wardha-2010
Sexual Reproduction in Flowering Plants
262576
Generally archesporium in an ovule is
1 single celled and hypodermal in origin
2 single celled and lies in the centre of the ovule
3 single celled and terminal in origin
4 many celled and lie in the centre
Explanation:
Generally archesporium in an ovule is single celled and hypodermal in origin. A group of cell from which a spore mother cell developed is called archesporium. The archesporial cells functions directly as a megaspore mother cell in the tenuinucellate ovules whereas it divides to form an outer parietal cell and inner primary sporogenous cell in the crassinucellate ovule.
CG PMT-2007 / CPMT-1980
Sexual Reproduction in Flowering Plants
262561
One of the most resistant known biological material is
1 lignin
2 hemicellulose
3 sporopollenin
4 ugnocellulose
Explanation:
One of the most resistant known biological material is sporopollenin. It is very stable and chemically inert. It is present in exine of pollen grains. Pollen grains have two layer of outer wall, one is intine and second is exine. It is resistant to enzymes and strong chemicals and even does not decompose in soil after hundred of years. Due to sporopollenin, pollen grains are found in fossils of hundreds of years old.
2001
Sexual Reproduction in Flowering Plants
262537
When pollen grain is shed at 3-celled stage, name the cells is contains.
1 1 vegetative cell and 2 male gametes
2 2 vegetative cells and 1 male gamete
3 2 generative cells and 1 male gamete
4 2 male gametes and 1 generative cell
Explanation:
A pollen grain with pollen tube carrying male gametes represent mature male gametophyte. Generative cell divides forming two male gametes and hence at 3 celled stage the pollen grain contain two male gametes and one negative cell.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262540
Fibrous thickenings of hygroscopic nature are found in this part of the anther wall:
1 Epidermis
2 Endothecium
3 Middle layers
4 Tapetum
Explanation:
Endothecium is an unilayer or radially elongated cell occurs in between the epidermis and middle layer of an angiospermic anther sac wall. Cell of endothecium cells possess a fibrous thickening in their cell wall that makes them hygroscopic, there by aiding in the dehydration of mature anther.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Sexual Reproduction in Flowering Plants
262594
In a flowering plant, archesporium gives rise to
1 Wall and tapetum
2 Only tapetum and sporogenous cells
3 Only wall of the sporangium
4 Both wall and sporogenous cells
Explanation:
In a flowering plant, archesporium gives rise to both wall and sprogenous cells. Archesporial cells present in a sporophyte that gives rise to spores after division. The division in archesporium leads to the formation of the anther wall and sporogenous cell. Then sporogenous cell will form microspore mother cell microspore mother cell after division give rise to microspore or male gamete.
MGIMS Wardha-2010
Sexual Reproduction in Flowering Plants
262576
Generally archesporium in an ovule is
1 single celled and hypodermal in origin
2 single celled and lies in the centre of the ovule
3 single celled and terminal in origin
4 many celled and lie in the centre
Explanation:
Generally archesporium in an ovule is single celled and hypodermal in origin. A group of cell from which a spore mother cell developed is called archesporium. The archesporial cells functions directly as a megaspore mother cell in the tenuinucellate ovules whereas it divides to form an outer parietal cell and inner primary sporogenous cell in the crassinucellate ovule.
CG PMT-2007 / CPMT-1980
Sexual Reproduction in Flowering Plants
262561
One of the most resistant known biological material is
1 lignin
2 hemicellulose
3 sporopollenin
4 ugnocellulose
Explanation:
One of the most resistant known biological material is sporopollenin. It is very stable and chemically inert. It is present in exine of pollen grains. Pollen grains have two layer of outer wall, one is intine and second is exine. It is resistant to enzymes and strong chemicals and even does not decompose in soil after hundred of years. Due to sporopollenin, pollen grains are found in fossils of hundreds of years old.
2001
Sexual Reproduction in Flowering Plants
262537
When pollen grain is shed at 3-celled stage, name the cells is contains.
1 1 vegetative cell and 2 male gametes
2 2 vegetative cells and 1 male gamete
3 2 generative cells and 1 male gamete
4 2 male gametes and 1 generative cell
Explanation:
A pollen grain with pollen tube carrying male gametes represent mature male gametophyte. Generative cell divides forming two male gametes and hence at 3 celled stage the pollen grain contain two male gametes and one negative cell.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262540
Fibrous thickenings of hygroscopic nature are found in this part of the anther wall:
1 Epidermis
2 Endothecium
3 Middle layers
4 Tapetum
Explanation:
Endothecium is an unilayer or radially elongated cell occurs in between the epidermis and middle layer of an angiospermic anther sac wall. Cell of endothecium cells possess a fibrous thickening in their cell wall that makes them hygroscopic, there by aiding in the dehydration of mature anther.
262594
In a flowering plant, archesporium gives rise to
1 Wall and tapetum
2 Only tapetum and sporogenous cells
3 Only wall of the sporangium
4 Both wall and sporogenous cells
Explanation:
In a flowering plant, archesporium gives rise to both wall and sprogenous cells. Archesporial cells present in a sporophyte that gives rise to spores after division. The division in archesporium leads to the formation of the anther wall and sporogenous cell. Then sporogenous cell will form microspore mother cell microspore mother cell after division give rise to microspore or male gamete.
MGIMS Wardha-2010
Sexual Reproduction in Flowering Plants
262576
Generally archesporium in an ovule is
1 single celled and hypodermal in origin
2 single celled and lies in the centre of the ovule
3 single celled and terminal in origin
4 many celled and lie in the centre
Explanation:
Generally archesporium in an ovule is single celled and hypodermal in origin. A group of cell from which a spore mother cell developed is called archesporium. The archesporial cells functions directly as a megaspore mother cell in the tenuinucellate ovules whereas it divides to form an outer parietal cell and inner primary sporogenous cell in the crassinucellate ovule.
CG PMT-2007 / CPMT-1980
Sexual Reproduction in Flowering Plants
262561
One of the most resistant known biological material is
1 lignin
2 hemicellulose
3 sporopollenin
4 ugnocellulose
Explanation:
One of the most resistant known biological material is sporopollenin. It is very stable and chemically inert. It is present in exine of pollen grains. Pollen grains have two layer of outer wall, one is intine and second is exine. It is resistant to enzymes and strong chemicals and even does not decompose in soil after hundred of years. Due to sporopollenin, pollen grains are found in fossils of hundreds of years old.
2001
Sexual Reproduction in Flowering Plants
262537
When pollen grain is shed at 3-celled stage, name the cells is contains.
1 1 vegetative cell and 2 male gametes
2 2 vegetative cells and 1 male gamete
3 2 generative cells and 1 male gamete
4 2 male gametes and 1 generative cell
Explanation:
A pollen grain with pollen tube carrying male gametes represent mature male gametophyte. Generative cell divides forming two male gametes and hence at 3 celled stage the pollen grain contain two male gametes and one negative cell.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262540
Fibrous thickenings of hygroscopic nature are found in this part of the anther wall:
1 Epidermis
2 Endothecium
3 Middle layers
4 Tapetum
Explanation:
Endothecium is an unilayer or radially elongated cell occurs in between the epidermis and middle layer of an angiospermic anther sac wall. Cell of endothecium cells possess a fibrous thickening in their cell wall that makes them hygroscopic, there by aiding in the dehydration of mature anther.