262644
Which of the following is not true for double fertilization?
1 Discovered by Nawaschin
2 Male gamete and secondary nucleus fused to form endosperm nucleus
3 Endosperm nucleus is diploid
4 Endosperm provides nutrition to embryo
Explanation:
In angiosperms, triple fusion take place between two polar nuclei and one sperm nucleus, which results in the formation of primary endosperm nucleus. This primary endosperm nucleus later evolves into an endosperm. It is used to provide nutrition to the developing embryo. It is present inside the seed of most flowering plant. This triple fusion occurs due to double fertilization in angiosperms.
BCECE-2005
Sexual Reproduction in Flowering Plants
262645
For the formation of tetrasporic embryosac, how many megaspore mother cells are required?
1 1
2 2
3 3
4 4
Explanation:
For the formation of tetrasporic embryosac. 1 megaspore mother cells is required. In tetrasporic condition, all the four megaspore nuclei takes part in the formation of embryo sac. In this type of embryo sac, meiosis is not accompanied by wall formation. ExPeperomia.
JIPMER-2005 / BHU PMT-2003
Sexual Reproduction in Flowering Plants
262647
What type of placentation is seen in sweet pea?
1 Basal
2 Axile
3 Free central
4 Marginal
Explanation:
Marginal placentation is seen in sweet pea. In this placentation, a ridge is formed by the placenta along the central row of the ovary. The development of ovule take place on the ridge. Placentation is the arrangement of ovule inside the ovary.
JCECE-2009
Sexual Reproduction in Flowering Plants
262648
Orthotropus ovule belongs to :
1 Urtica
2 Peperomia
3 Polygonum
4 all of these
Explanation:
The ovule is said to be orthotropus or straight when the funicle, chalaza and the micropyle come to lie one vertical plane. This type of ovule is a primitive feature in angiosperms. The common example are- polygonum, Rumex, piper, peperomia, utrica etc.
262644
Which of the following is not true for double fertilization?
1 Discovered by Nawaschin
2 Male gamete and secondary nucleus fused to form endosperm nucleus
3 Endosperm nucleus is diploid
4 Endosperm provides nutrition to embryo
Explanation:
In angiosperms, triple fusion take place between two polar nuclei and one sperm nucleus, which results in the formation of primary endosperm nucleus. This primary endosperm nucleus later evolves into an endosperm. It is used to provide nutrition to the developing embryo. It is present inside the seed of most flowering plant. This triple fusion occurs due to double fertilization in angiosperms.
BCECE-2005
Sexual Reproduction in Flowering Plants
262645
For the formation of tetrasporic embryosac, how many megaspore mother cells are required?
1 1
2 2
3 3
4 4
Explanation:
For the formation of tetrasporic embryosac. 1 megaspore mother cells is required. In tetrasporic condition, all the four megaspore nuclei takes part in the formation of embryo sac. In this type of embryo sac, meiosis is not accompanied by wall formation. ExPeperomia.
JIPMER-2005 / BHU PMT-2003
Sexual Reproduction in Flowering Plants
262647
What type of placentation is seen in sweet pea?
1 Basal
2 Axile
3 Free central
4 Marginal
Explanation:
Marginal placentation is seen in sweet pea. In this placentation, a ridge is formed by the placenta along the central row of the ovary. The development of ovule take place on the ridge. Placentation is the arrangement of ovule inside the ovary.
JCECE-2009
Sexual Reproduction in Flowering Plants
262648
Orthotropus ovule belongs to :
1 Urtica
2 Peperomia
3 Polygonum
4 all of these
Explanation:
The ovule is said to be orthotropus or straight when the funicle, chalaza and the micropyle come to lie one vertical plane. This type of ovule is a primitive feature in angiosperms. The common example are- polygonum, Rumex, piper, peperomia, utrica etc.
262644
Which of the following is not true for double fertilization?
1 Discovered by Nawaschin
2 Male gamete and secondary nucleus fused to form endosperm nucleus
3 Endosperm nucleus is diploid
4 Endosperm provides nutrition to embryo
Explanation:
In angiosperms, triple fusion take place between two polar nuclei and one sperm nucleus, which results in the formation of primary endosperm nucleus. This primary endosperm nucleus later evolves into an endosperm. It is used to provide nutrition to the developing embryo. It is present inside the seed of most flowering plant. This triple fusion occurs due to double fertilization in angiosperms.
BCECE-2005
Sexual Reproduction in Flowering Plants
262645
For the formation of tetrasporic embryosac, how many megaspore mother cells are required?
1 1
2 2
3 3
4 4
Explanation:
For the formation of tetrasporic embryosac. 1 megaspore mother cells is required. In tetrasporic condition, all the four megaspore nuclei takes part in the formation of embryo sac. In this type of embryo sac, meiosis is not accompanied by wall formation. ExPeperomia.
JIPMER-2005 / BHU PMT-2003
Sexual Reproduction in Flowering Plants
262647
What type of placentation is seen in sweet pea?
1 Basal
2 Axile
3 Free central
4 Marginal
Explanation:
Marginal placentation is seen in sweet pea. In this placentation, a ridge is formed by the placenta along the central row of the ovary. The development of ovule take place on the ridge. Placentation is the arrangement of ovule inside the ovary.
JCECE-2009
Sexual Reproduction in Flowering Plants
262648
Orthotropus ovule belongs to :
1 Urtica
2 Peperomia
3 Polygonum
4 all of these
Explanation:
The ovule is said to be orthotropus or straight when the funicle, chalaza and the micropyle come to lie one vertical plane. This type of ovule is a primitive feature in angiosperms. The common example are- polygonum, Rumex, piper, peperomia, utrica etc.
262644
Which of the following is not true for double fertilization?
1 Discovered by Nawaschin
2 Male gamete and secondary nucleus fused to form endosperm nucleus
3 Endosperm nucleus is diploid
4 Endosperm provides nutrition to embryo
Explanation:
In angiosperms, triple fusion take place between two polar nuclei and one sperm nucleus, which results in the formation of primary endosperm nucleus. This primary endosperm nucleus later evolves into an endosperm. It is used to provide nutrition to the developing embryo. It is present inside the seed of most flowering plant. This triple fusion occurs due to double fertilization in angiosperms.
BCECE-2005
Sexual Reproduction in Flowering Plants
262645
For the formation of tetrasporic embryosac, how many megaspore mother cells are required?
1 1
2 2
3 3
4 4
Explanation:
For the formation of tetrasporic embryosac. 1 megaspore mother cells is required. In tetrasporic condition, all the four megaspore nuclei takes part in the formation of embryo sac. In this type of embryo sac, meiosis is not accompanied by wall formation. ExPeperomia.
JIPMER-2005 / BHU PMT-2003
Sexual Reproduction in Flowering Plants
262647
What type of placentation is seen in sweet pea?
1 Basal
2 Axile
3 Free central
4 Marginal
Explanation:
Marginal placentation is seen in sweet pea. In this placentation, a ridge is formed by the placenta along the central row of the ovary. The development of ovule take place on the ridge. Placentation is the arrangement of ovule inside the ovary.
JCECE-2009
Sexual Reproduction in Flowering Plants
262648
Orthotropus ovule belongs to :
1 Urtica
2 Peperomia
3 Polygonum
4 all of these
Explanation:
The ovule is said to be orthotropus or straight when the funicle, chalaza and the micropyle come to lie one vertical plane. This type of ovule is a primitive feature in angiosperms. The common example are- polygonum, Rumex, piper, peperomia, utrica etc.
