262670
In flowering plants, a mature female Gametophyte is derived from "Megaspore mother cell" by
1 One meiotic division and three mitotic division
2 Three meiotic divisions
3 One meiotic division and two mitotic division
4 One meiotic division and one mitotic division
Explanation:
In flowering plants, a mature female gametophyte is derived from diploid megaspore mother cell by one meiotic division and three mitotic division. The meiotic division leads to the production of four haploid megaspore. Three of them degenerate and only one remains functional. This functional megaspore undergoes three successive meiotic division and produce eight nucleate cell which is called as embryo sac.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262671
Mesogamy is the entry of pollen tube into the ovule through
1 Nucellus
2 Integuments
3 Micropyle
4 Chalaza
Explanation:
Mesogamy is the entry of pollen tube into the ovule through integuments. Porogamy is the entry of pollen tube into the ovule through micropyle. Chalazogamy is the entry of pollen tube into ovule through chalaza.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262673
Eight nucleate embryo sacs are
1 always bisporic
2 always tetrasporic
3 always monosporic
4 sometimes monosporic, sometimes bisporic and sometime tetrasporic
Explanation:
Eight nucleate embryo sacs are sometimes monosporic, sometimes bisporic and sometime tetrasporic. In monosporic embryo sac, out of four megaspores, three degenerate and only one remain functional. This functional megaspore develop into the embryo sac. In bisporic embryo sac, two megaspores take part in the formation of embryo sac. They undergo 2 mitotic divisions. In tetrasporic embryo sac, all four megaspores take part in the formation of embryo sac. Here meiotic divisons in the megaspore mother cell are not followed by cell wall formation.
Haryana PMT-2010
Sexual Reproduction in Flowering Plants
262674
Micropyle helps in :
1 germination of pollen grain
2 growth of pollen tube
3 coming out of pollen tube from pollen grain
4 allowing entry of pollen tube
Explanation:
Micropyle helps in the entry of pollen tube. It is a small opening in ovule and retained in the seed after fertilisation. In seeds it helps in the respiration and in the exchange of gases.
262670
In flowering plants, a mature female Gametophyte is derived from "Megaspore mother cell" by
1 One meiotic division and three mitotic division
2 Three meiotic divisions
3 One meiotic division and two mitotic division
4 One meiotic division and one mitotic division
Explanation:
In flowering plants, a mature female gametophyte is derived from diploid megaspore mother cell by one meiotic division and three mitotic division. The meiotic division leads to the production of four haploid megaspore. Three of them degenerate and only one remains functional. This functional megaspore undergoes three successive meiotic division and produce eight nucleate cell which is called as embryo sac.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262671
Mesogamy is the entry of pollen tube into the ovule through
1 Nucellus
2 Integuments
3 Micropyle
4 Chalaza
Explanation:
Mesogamy is the entry of pollen tube into the ovule through integuments. Porogamy is the entry of pollen tube into the ovule through micropyle. Chalazogamy is the entry of pollen tube into ovule through chalaza.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262673
Eight nucleate embryo sacs are
1 always bisporic
2 always tetrasporic
3 always monosporic
4 sometimes monosporic, sometimes bisporic and sometime tetrasporic
Explanation:
Eight nucleate embryo sacs are sometimes monosporic, sometimes bisporic and sometime tetrasporic. In monosporic embryo sac, out of four megaspores, three degenerate and only one remain functional. This functional megaspore develop into the embryo sac. In bisporic embryo sac, two megaspores take part in the formation of embryo sac. They undergo 2 mitotic divisions. In tetrasporic embryo sac, all four megaspores take part in the formation of embryo sac. Here meiotic divisons in the megaspore mother cell are not followed by cell wall formation.
Haryana PMT-2010
Sexual Reproduction in Flowering Plants
262674
Micropyle helps in :
1 germination of pollen grain
2 growth of pollen tube
3 coming out of pollen tube from pollen grain
4 allowing entry of pollen tube
Explanation:
Micropyle helps in the entry of pollen tube. It is a small opening in ovule and retained in the seed after fertilisation. In seeds it helps in the respiration and in the exchange of gases.
262670
In flowering plants, a mature female Gametophyte is derived from "Megaspore mother cell" by
1 One meiotic division and three mitotic division
2 Three meiotic divisions
3 One meiotic division and two mitotic division
4 One meiotic division and one mitotic division
Explanation:
In flowering plants, a mature female gametophyte is derived from diploid megaspore mother cell by one meiotic division and three mitotic division. The meiotic division leads to the production of four haploid megaspore. Three of them degenerate and only one remains functional. This functional megaspore undergoes three successive meiotic division and produce eight nucleate cell which is called as embryo sac.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262671
Mesogamy is the entry of pollen tube into the ovule through
1 Nucellus
2 Integuments
3 Micropyle
4 Chalaza
Explanation:
Mesogamy is the entry of pollen tube into the ovule through integuments. Porogamy is the entry of pollen tube into the ovule through micropyle. Chalazogamy is the entry of pollen tube into ovule through chalaza.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262673
Eight nucleate embryo sacs are
1 always bisporic
2 always tetrasporic
3 always monosporic
4 sometimes monosporic, sometimes bisporic and sometime tetrasporic
Explanation:
Eight nucleate embryo sacs are sometimes monosporic, sometimes bisporic and sometime tetrasporic. In monosporic embryo sac, out of four megaspores, three degenerate and only one remain functional. This functional megaspore develop into the embryo sac. In bisporic embryo sac, two megaspores take part in the formation of embryo sac. They undergo 2 mitotic divisions. In tetrasporic embryo sac, all four megaspores take part in the formation of embryo sac. Here meiotic divisons in the megaspore mother cell are not followed by cell wall formation.
Haryana PMT-2010
Sexual Reproduction in Flowering Plants
262674
Micropyle helps in :
1 germination of pollen grain
2 growth of pollen tube
3 coming out of pollen tube from pollen grain
4 allowing entry of pollen tube
Explanation:
Micropyle helps in the entry of pollen tube. It is a small opening in ovule and retained in the seed after fertilisation. In seeds it helps in the respiration and in the exchange of gases.
262670
In flowering plants, a mature female Gametophyte is derived from "Megaspore mother cell" by
1 One meiotic division and three mitotic division
2 Three meiotic divisions
3 One meiotic division and two mitotic division
4 One meiotic division and one mitotic division
Explanation:
In flowering plants, a mature female gametophyte is derived from diploid megaspore mother cell by one meiotic division and three mitotic division. The meiotic division leads to the production of four haploid megaspore. Three of them degenerate and only one remains functional. This functional megaspore undergoes three successive meiotic division and produce eight nucleate cell which is called as embryo sac.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262671
Mesogamy is the entry of pollen tube into the ovule through
1 Nucellus
2 Integuments
3 Micropyle
4 Chalaza
Explanation:
Mesogamy is the entry of pollen tube into the ovule through integuments. Porogamy is the entry of pollen tube into the ovule through micropyle. Chalazogamy is the entry of pollen tube into ovule through chalaza.
AP EAMCET-25.09.2020 Shift-II
Sexual Reproduction in Flowering Plants
262673
Eight nucleate embryo sacs are
1 always bisporic
2 always tetrasporic
3 always monosporic
4 sometimes monosporic, sometimes bisporic and sometime tetrasporic
Explanation:
Eight nucleate embryo sacs are sometimes monosporic, sometimes bisporic and sometime tetrasporic. In monosporic embryo sac, out of four megaspores, three degenerate and only one remain functional. This functional megaspore develop into the embryo sac. In bisporic embryo sac, two megaspores take part in the formation of embryo sac. They undergo 2 mitotic divisions. In tetrasporic embryo sac, all four megaspores take part in the formation of embryo sac. Here meiotic divisons in the megaspore mother cell are not followed by cell wall formation.
Haryana PMT-2010
Sexual Reproduction in Flowering Plants
262674
Micropyle helps in :
1 germination of pollen grain
2 growth of pollen tube
3 coming out of pollen tube from pollen grain
4 allowing entry of pollen tube
Explanation:
Micropyle helps in the entry of pollen tube. It is a small opening in ovule and retained in the seed after fertilisation. In seeds it helps in the respiration and in the exchange of gases.
