Germ pore is a tiny pore present on the outer layer (exine) of pollen grains where sporopollenin is absent. The main function of germ pore is initiation of pollen tube. It also plays a part in the release of male gametes. Absorption of water for seed germination occurs through a small opening in seed called the micropyle by the process of imbibitions.
J and K CET-2015
Sexual Reproduction in Flowering Plants
262585
The highly resistant biological material of which the exine of a pollen grain is made up is called
1 cutin
2 lignin
3 suberin
4 none of these
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine.
AMU-1997
Sexual Reproduction in Flowering Plants
262586
Characteristic three successive free nuclear mitotic divisions are involved in the development of in angiosperms.
1 female gametophyte
2 embryo
3 male gametophyte
4 endosperm
Explanation:
Characteristic three successive free nuclear mitotic divisions are involved in the development of female gametophyte or embryo sac in angiosperms. It is 8 nucleate and 7 celled structure. The polar nuclei move to center to combine and generate a single diploid cell at that location. This single diploid cell fuses with male gamete to form the triploid endosperm. The other three nuclei grow into antipodal cells while two modify into synergid cells which degenerate gradually.
MHT CET-07.10.2020 Shift-I
Sexual Reproduction in Flowering Plants
262588
Pollen grains of a plant whose \(2 \mathrm{n}=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 28
2 21
3 14
4 56
Explanation:
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. Plants are diploid in nature but pollen grains (male gamete) are haploid in nature. So, the chromosome no. of pollen grains is 14. Then the number of chromosomes in the cells of the callus is 14 .
Germ pore is a tiny pore present on the outer layer (exine) of pollen grains where sporopollenin is absent. The main function of germ pore is initiation of pollen tube. It also plays a part in the release of male gametes. Absorption of water for seed germination occurs through a small opening in seed called the micropyle by the process of imbibitions.
J and K CET-2015
Sexual Reproduction in Flowering Plants
262585
The highly resistant biological material of which the exine of a pollen grain is made up is called
1 cutin
2 lignin
3 suberin
4 none of these
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine.
AMU-1997
Sexual Reproduction in Flowering Plants
262586
Characteristic three successive free nuclear mitotic divisions are involved in the development of in angiosperms.
1 female gametophyte
2 embryo
3 male gametophyte
4 endosperm
Explanation:
Characteristic three successive free nuclear mitotic divisions are involved in the development of female gametophyte or embryo sac in angiosperms. It is 8 nucleate and 7 celled structure. The polar nuclei move to center to combine and generate a single diploid cell at that location. This single diploid cell fuses with male gamete to form the triploid endosperm. The other three nuclei grow into antipodal cells while two modify into synergid cells which degenerate gradually.
MHT CET-07.10.2020 Shift-I
Sexual Reproduction in Flowering Plants
262588
Pollen grains of a plant whose \(2 \mathrm{n}=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 28
2 21
3 14
4 56
Explanation:
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. Plants are diploid in nature but pollen grains (male gamete) are haploid in nature. So, the chromosome no. of pollen grains is 14. Then the number of chromosomes in the cells of the callus is 14 .
Germ pore is a tiny pore present on the outer layer (exine) of pollen grains where sporopollenin is absent. The main function of germ pore is initiation of pollen tube. It also plays a part in the release of male gametes. Absorption of water for seed germination occurs through a small opening in seed called the micropyle by the process of imbibitions.
J and K CET-2015
Sexual Reproduction in Flowering Plants
262585
The highly resistant biological material of which the exine of a pollen grain is made up is called
1 cutin
2 lignin
3 suberin
4 none of these
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine.
AMU-1997
Sexual Reproduction in Flowering Plants
262586
Characteristic three successive free nuclear mitotic divisions are involved in the development of in angiosperms.
1 female gametophyte
2 embryo
3 male gametophyte
4 endosperm
Explanation:
Characteristic three successive free nuclear mitotic divisions are involved in the development of female gametophyte or embryo sac in angiosperms. It is 8 nucleate and 7 celled structure. The polar nuclei move to center to combine and generate a single diploid cell at that location. This single diploid cell fuses with male gamete to form the triploid endosperm. The other three nuclei grow into antipodal cells while two modify into synergid cells which degenerate gradually.
MHT CET-07.10.2020 Shift-I
Sexual Reproduction in Flowering Plants
262588
Pollen grains of a plant whose \(2 \mathrm{n}=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 28
2 21
3 14
4 56
Explanation:
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. Plants are diploid in nature but pollen grains (male gamete) are haploid in nature. So, the chromosome no. of pollen grains is 14. Then the number of chromosomes in the cells of the callus is 14 .
Germ pore is a tiny pore present on the outer layer (exine) of pollen grains where sporopollenin is absent. The main function of germ pore is initiation of pollen tube. It also plays a part in the release of male gametes. Absorption of water for seed germination occurs through a small opening in seed called the micropyle by the process of imbibitions.
J and K CET-2015
Sexual Reproduction in Flowering Plants
262585
The highly resistant biological material of which the exine of a pollen grain is made up is called
1 cutin
2 lignin
3 suberin
4 none of these
Explanation:
Exine of pollen grains are made up of sporopollenin. Spropollenin is the most resistant known biological material. Pollen grains is male gamete with two layerd cell wall. Outer covering is tough called exine and inner covering is intine.
AMU-1997
Sexual Reproduction in Flowering Plants
262586
Characteristic three successive free nuclear mitotic divisions are involved in the development of in angiosperms.
1 female gametophyte
2 embryo
3 male gametophyte
4 endosperm
Explanation:
Characteristic three successive free nuclear mitotic divisions are involved in the development of female gametophyte or embryo sac in angiosperms. It is 8 nucleate and 7 celled structure. The polar nuclei move to center to combine and generate a single diploid cell at that location. This single diploid cell fuses with male gamete to form the triploid endosperm. The other three nuclei grow into antipodal cells while two modify into synergid cells which degenerate gradually.
MHT CET-07.10.2020 Shift-I
Sexual Reproduction in Flowering Plants
262588
Pollen grains of a plant whose \(2 \mathrm{n}=28\) are cultured to get callus by tissue culture method. What would be the number of chromosomes in the cells of the callus?
1 28
2 21
3 14
4 56
Explanation:
Pollen grains of a plant whose \(2 n=28\) are cultured to get callus by tissue culture method. Plants are diploid in nature but pollen grains (male gamete) are haploid in nature. So, the chromosome no. of pollen grains is 14. Then the number of chromosomes in the cells of the callus is 14 .
