NEET Test Series from KOTA - 10 Papers In MS WORD
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Sexual Reproduction in Flowering Plants
262651
Which is correct statement ? (1) seed cannot be formed after on fertilization (2) seed is formed after one fertilization (3) seed is formed before double fertilization (4) fruit is produced after double fertilization
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The process of fertilization is unique in angiosperm and it is called as double fertilisaiton. Double fertilization involve 2 steps. First step is syngamy between one egg cell and one male gamete which results in seed formation. Second step is fusion between diploid secondary nucleus and one male gamete. This step is called triple fusion and results in the formation of endosperm. After this step fruit is fermed.
BHU PMT (Mains)-2005
Sexual Reproduction in Flowering Plants
262654
If the chromosome number of leaf cell is 42 the chromosome number of root cell, microspore mother cell and embryo respectively will be :
1 \(42,42,42\)
2 \(42,21,21\)
3 \(21,21,21\)
4 21, 21, 42
Explanation:
If the chromosome number of leaf cell is 42, then the chromosome number of root cell, microspore mother cell and embryo respectively will be 42,42 and 42 because these all are diploid in nature. Only the male and female gametes are haploid and they contain half the chromosome number of a plant body.
BHU PMT-2001
Sexual Reproduction in Flowering Plants
262676
The role of synergids is explained in:
1 physiology
2 pteriodology
3 embryology
4 bryology
Explanation:
The role of synergids is explained in embryology. Two synergids are present at micropylar end. Out of these two, one synergid cell degenerate and provide a way for the entry of the pollen tube in the embryo sac. They also act as a shock absorber at the time of entry of pollen tubes.
AP EAMCET-1997
Sexual Reproduction in Flowering Plants
262655
The egg apparatus of angiosperm comprises
1 an egg cell and two antipodals
2 an egg cell and two synergids
3 an egg cell and two polar nuclei
4 an egg cell and the central cell
Explanation:
In a flowering plant, megaspore develops into an embryo sac. Which contain 7 cells and 8 nuclei. 3 cells are form egg apparatus mid of which called egg cell and present at micropylar end. One cell present at middle of the embryo sac called secondary nuclei. Which contain two nuclei and rest 3 cells are form antipodal cell and present at chalazal end.
262651
Which is correct statement ? (1) seed cannot be formed after on fertilization (2) seed is formed after one fertilization (3) seed is formed before double fertilization (4) fruit is produced after double fertilization
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The process of fertilization is unique in angiosperm and it is called as double fertilisaiton. Double fertilization involve 2 steps. First step is syngamy between one egg cell and one male gamete which results in seed formation. Second step is fusion between diploid secondary nucleus and one male gamete. This step is called triple fusion and results in the formation of endosperm. After this step fruit is fermed.
BHU PMT (Mains)-2005
Sexual Reproduction in Flowering Plants
262654
If the chromosome number of leaf cell is 42 the chromosome number of root cell, microspore mother cell and embryo respectively will be :
1 \(42,42,42\)
2 \(42,21,21\)
3 \(21,21,21\)
4 21, 21, 42
Explanation:
If the chromosome number of leaf cell is 42, then the chromosome number of root cell, microspore mother cell and embryo respectively will be 42,42 and 42 because these all are diploid in nature. Only the male and female gametes are haploid and they contain half the chromosome number of a plant body.
BHU PMT-2001
Sexual Reproduction in Flowering Plants
262676
The role of synergids is explained in:
1 physiology
2 pteriodology
3 embryology
4 bryology
Explanation:
The role of synergids is explained in embryology. Two synergids are present at micropylar end. Out of these two, one synergid cell degenerate and provide a way for the entry of the pollen tube in the embryo sac. They also act as a shock absorber at the time of entry of pollen tubes.
AP EAMCET-1997
Sexual Reproduction in Flowering Plants
262655
The egg apparatus of angiosperm comprises
1 an egg cell and two antipodals
2 an egg cell and two synergids
3 an egg cell and two polar nuclei
4 an egg cell and the central cell
Explanation:
In a flowering plant, megaspore develops into an embryo sac. Which contain 7 cells and 8 nuclei. 3 cells are form egg apparatus mid of which called egg cell and present at micropylar end. One cell present at middle of the embryo sac called secondary nuclei. Which contain two nuclei and rest 3 cells are form antipodal cell and present at chalazal end.
262651
Which is correct statement ? (1) seed cannot be formed after on fertilization (2) seed is formed after one fertilization (3) seed is formed before double fertilization (4) fruit is produced after double fertilization
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The process of fertilization is unique in angiosperm and it is called as double fertilisaiton. Double fertilization involve 2 steps. First step is syngamy between one egg cell and one male gamete which results in seed formation. Second step is fusion between diploid secondary nucleus and one male gamete. This step is called triple fusion and results in the formation of endosperm. After this step fruit is fermed.
BHU PMT (Mains)-2005
Sexual Reproduction in Flowering Plants
262654
If the chromosome number of leaf cell is 42 the chromosome number of root cell, microspore mother cell and embryo respectively will be :
1 \(42,42,42\)
2 \(42,21,21\)
3 \(21,21,21\)
4 21, 21, 42
Explanation:
If the chromosome number of leaf cell is 42, then the chromosome number of root cell, microspore mother cell and embryo respectively will be 42,42 and 42 because these all are diploid in nature. Only the male and female gametes are haploid and they contain half the chromosome number of a plant body.
BHU PMT-2001
Sexual Reproduction in Flowering Plants
262676
The role of synergids is explained in:
1 physiology
2 pteriodology
3 embryology
4 bryology
Explanation:
The role of synergids is explained in embryology. Two synergids are present at micropylar end. Out of these two, one synergid cell degenerate and provide a way for the entry of the pollen tube in the embryo sac. They also act as a shock absorber at the time of entry of pollen tubes.
AP EAMCET-1997
Sexual Reproduction in Flowering Plants
262655
The egg apparatus of angiosperm comprises
1 an egg cell and two antipodals
2 an egg cell and two synergids
3 an egg cell and two polar nuclei
4 an egg cell and the central cell
Explanation:
In a flowering plant, megaspore develops into an embryo sac. Which contain 7 cells and 8 nuclei. 3 cells are form egg apparatus mid of which called egg cell and present at micropylar end. One cell present at middle of the embryo sac called secondary nuclei. Which contain two nuclei and rest 3 cells are form antipodal cell and present at chalazal end.
262651
Which is correct statement ? (1) seed cannot be formed after on fertilization (2) seed is formed after one fertilization (3) seed is formed before double fertilization (4) fruit is produced after double fertilization
1 1,2 and 3 are correct
2 1 and 2 are correct
3 2 and 4 are correct
4 1 and 3 are correct
Explanation:
The process of fertilization is unique in angiosperm and it is called as double fertilisaiton. Double fertilization involve 2 steps. First step is syngamy between one egg cell and one male gamete which results in seed formation. Second step is fusion between diploid secondary nucleus and one male gamete. This step is called triple fusion and results in the formation of endosperm. After this step fruit is fermed.
BHU PMT (Mains)-2005
Sexual Reproduction in Flowering Plants
262654
If the chromosome number of leaf cell is 42 the chromosome number of root cell, microspore mother cell and embryo respectively will be :
1 \(42,42,42\)
2 \(42,21,21\)
3 \(21,21,21\)
4 21, 21, 42
Explanation:
If the chromosome number of leaf cell is 42, then the chromosome number of root cell, microspore mother cell and embryo respectively will be 42,42 and 42 because these all are diploid in nature. Only the male and female gametes are haploid and they contain half the chromosome number of a plant body.
BHU PMT-2001
Sexual Reproduction in Flowering Plants
262676
The role of synergids is explained in:
1 physiology
2 pteriodology
3 embryology
4 bryology
Explanation:
The role of synergids is explained in embryology. Two synergids are present at micropylar end. Out of these two, one synergid cell degenerate and provide a way for the entry of the pollen tube in the embryo sac. They also act as a shock absorber at the time of entry of pollen tubes.
AP EAMCET-1997
Sexual Reproduction in Flowering Plants
262655
The egg apparatus of angiosperm comprises
1 an egg cell and two antipodals
2 an egg cell and two synergids
3 an egg cell and two polar nuclei
4 an egg cell and the central cell
Explanation:
In a flowering plant, megaspore develops into an embryo sac. Which contain 7 cells and 8 nuclei. 3 cells are form egg apparatus mid of which called egg cell and present at micropylar end. One cell present at middle of the embryo sac called secondary nuclei. Which contain two nuclei and rest 3 cells are form antipodal cell and present at chalazal end.
