There are two nucleus in mature pollen grain vegetative (the bigger one responsible for pollen grain development) and generative (the Smaller one fused with the egg). Pollen grain is the mother cell of male gametophyte. - The tube nucleus guides or controls the growth of pollen tube and cells follow the path of the tube nucleus. Tube nucleus control the direct growth of pollen tube.
UP CPMT-2006
Sexual Reproduction in Flowering Plants
262538
Among the following statements related to pollens, choose the correct one. Statement I: In \(40 \%\) of angiosperms pollen grains are shed at 3-celled stage. Statement II: Intine is made of cellulose and pectin and it is discontinuous with germ pores.
1 Both I and II are correct
2 Both I and II are incorrect
3 I is correct and II is incorrect
4 I is incorrect and II is correct
Explanation:
In over \(40 \%\) of angiosperm, pollen grains are shed during 3-celled stage. Pollen is essential for sexual reproduction of angiosperms and plants that produce cones. Each pollen grain contains male gametes necessary for fertilization. The scientific study of living and fossilized pollen grains is known as palynology. The pollen grains is protected by two layers the outer exine and the inner intine. The exine is made of chemical substance sporopollenin, while the intine contains in parts cellulose and hemicelluloses. It is continuous with the germ pore, while exine is discontinuous with the germ pore.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262539
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 21
2 14
3 56
4 28
Explanation:
Pollen grain are produced by meiosis pollen of plant with \(2 n=28\) \(\mathrm{n}=14\) chromosomes.
Karnataka CET-2009
Sexual Reproduction in Flowering Plants
262541
Which one of the following is resistant to enzyme action?
1 Pollen exine
2 Leaf cuticle
3 Cork
4 Wood fibre
Explanation:
Pollen has a outer hard layer called exine. This exine is made up of sporopollenin protein which is one of the most resistance organic material known. No enzyme so for known that can degrade exine. It is also resistant to high temperatures. Leaf cuticle, cork, wood fibre all are prone to enzyme action.
There are two nucleus in mature pollen grain vegetative (the bigger one responsible for pollen grain development) and generative (the Smaller one fused with the egg). Pollen grain is the mother cell of male gametophyte. - The tube nucleus guides or controls the growth of pollen tube and cells follow the path of the tube nucleus. Tube nucleus control the direct growth of pollen tube.
UP CPMT-2006
Sexual Reproduction in Flowering Plants
262538
Among the following statements related to pollens, choose the correct one. Statement I: In \(40 \%\) of angiosperms pollen grains are shed at 3-celled stage. Statement II: Intine is made of cellulose and pectin and it is discontinuous with germ pores.
1 Both I and II are correct
2 Both I and II are incorrect
3 I is correct and II is incorrect
4 I is incorrect and II is correct
Explanation:
In over \(40 \%\) of angiosperm, pollen grains are shed during 3-celled stage. Pollen is essential for sexual reproduction of angiosperms and plants that produce cones. Each pollen grain contains male gametes necessary for fertilization. The scientific study of living and fossilized pollen grains is known as palynology. The pollen grains is protected by two layers the outer exine and the inner intine. The exine is made of chemical substance sporopollenin, while the intine contains in parts cellulose and hemicelluloses. It is continuous with the germ pore, while exine is discontinuous with the germ pore.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262539
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 21
2 14
3 56
4 28
Explanation:
Pollen grain are produced by meiosis pollen of plant with \(2 n=28\) \(\mathrm{n}=14\) chromosomes.
Karnataka CET-2009
Sexual Reproduction in Flowering Plants
262541
Which one of the following is resistant to enzyme action?
1 Pollen exine
2 Leaf cuticle
3 Cork
4 Wood fibre
Explanation:
Pollen has a outer hard layer called exine. This exine is made up of sporopollenin protein which is one of the most resistance organic material known. No enzyme so for known that can degrade exine. It is also resistant to high temperatures. Leaf cuticle, cork, wood fibre all are prone to enzyme action.
There are two nucleus in mature pollen grain vegetative (the bigger one responsible for pollen grain development) and generative (the Smaller one fused with the egg). Pollen grain is the mother cell of male gametophyte. - The tube nucleus guides or controls the growth of pollen tube and cells follow the path of the tube nucleus. Tube nucleus control the direct growth of pollen tube.
UP CPMT-2006
Sexual Reproduction in Flowering Plants
262538
Among the following statements related to pollens, choose the correct one. Statement I: In \(40 \%\) of angiosperms pollen grains are shed at 3-celled stage. Statement II: Intine is made of cellulose and pectin and it is discontinuous with germ pores.
1 Both I and II are correct
2 Both I and II are incorrect
3 I is correct and II is incorrect
4 I is incorrect and II is correct
Explanation:
In over \(40 \%\) of angiosperm, pollen grains are shed during 3-celled stage. Pollen is essential for sexual reproduction of angiosperms and plants that produce cones. Each pollen grain contains male gametes necessary for fertilization. The scientific study of living and fossilized pollen grains is known as palynology. The pollen grains is protected by two layers the outer exine and the inner intine. The exine is made of chemical substance sporopollenin, while the intine contains in parts cellulose and hemicelluloses. It is continuous with the germ pore, while exine is discontinuous with the germ pore.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262539
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 21
2 14
3 56
4 28
Explanation:
Pollen grain are produced by meiosis pollen of plant with \(2 n=28\) \(\mathrm{n}=14\) chromosomes.
Karnataka CET-2009
Sexual Reproduction in Flowering Plants
262541
Which one of the following is resistant to enzyme action?
1 Pollen exine
2 Leaf cuticle
3 Cork
4 Wood fibre
Explanation:
Pollen has a outer hard layer called exine. This exine is made up of sporopollenin protein which is one of the most resistance organic material known. No enzyme so for known that can degrade exine. It is also resistant to high temperatures. Leaf cuticle, cork, wood fibre all are prone to enzyme action.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Sexual Reproduction in Flowering Plants
262536
Large nucleus in a pollen grain is
1 tube nucleus
2 sperm nucleus
3 generative nucleus
4 none of these
Explanation:
There are two nucleus in mature pollen grain vegetative (the bigger one responsible for pollen grain development) and generative (the Smaller one fused with the egg). Pollen grain is the mother cell of male gametophyte. - The tube nucleus guides or controls the growth of pollen tube and cells follow the path of the tube nucleus. Tube nucleus control the direct growth of pollen tube.
UP CPMT-2006
Sexual Reproduction in Flowering Plants
262538
Among the following statements related to pollens, choose the correct one. Statement I: In \(40 \%\) of angiosperms pollen grains are shed at 3-celled stage. Statement II: Intine is made of cellulose and pectin and it is discontinuous with germ pores.
1 Both I and II are correct
2 Both I and II are incorrect
3 I is correct and II is incorrect
4 I is incorrect and II is correct
Explanation:
In over \(40 \%\) of angiosperm, pollen grains are shed during 3-celled stage. Pollen is essential for sexual reproduction of angiosperms and plants that produce cones. Each pollen grain contains male gametes necessary for fertilization. The scientific study of living and fossilized pollen grains is known as palynology. The pollen grains is protected by two layers the outer exine and the inner intine. The exine is made of chemical substance sporopollenin, while the intine contains in parts cellulose and hemicelluloses. It is continuous with the germ pore, while exine is discontinuous with the germ pore.
Karnataka CET-2018
Sexual Reproduction in Flowering Plants
262539
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 21
2 14
3 56
4 28
Explanation:
Pollen grain are produced by meiosis pollen of plant with \(2 n=28\) \(\mathrm{n}=14\) chromosomes.
Karnataka CET-2009
Sexual Reproduction in Flowering Plants
262541
Which one of the following is resistant to enzyme action?
1 Pollen exine
2 Leaf cuticle
3 Cork
4 Wood fibre
Explanation:
Pollen has a outer hard layer called exine. This exine is made up of sporopollenin protein which is one of the most resistance organic material known. No enzyme so for known that can degrade exine. It is also resistant to high temperatures. Leaf cuticle, cork, wood fibre all are prone to enzyme action.
