341941
Statement A : In over 60 per cent of angiosperms, pollen grains are shed at this 3-celled stage. Statement B : Parthenium or carrot came into India as a contaminant with imported wheat.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. Parthenium or carrot grass that came into India as a contaminant with imported wheat.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341942
Viability of pollen grains depend upon
1 Prevailing temperature
2 A particular species
3 Humidity
4 All of the above
Explanation:
The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341943
A plant has \(2n = 28\). Their pollen grains are cultured to get callus by tissue cultured method. What would be the number of chromosomes in the cells of the callus
1 21
2 42
3 56
4 14
Explanation:
If plant has diploid\(\left( {2n = 28} \right)\),pollen grain are hoploid \(\left( {n = 14} \right)\).
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341944
In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?
1 25
2 50
3 75
4 100
Explanation:
Each MMC produces 4 pollen grains from 1 meiotic division. So to produce 100 pollen grains 25 meiotic divisions are required. \(\left( {25 \times 4 = 100} \right)\)
341941
Statement A : In over 60 per cent of angiosperms, pollen grains are shed at this 3-celled stage. Statement B : Parthenium or carrot came into India as a contaminant with imported wheat.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. Parthenium or carrot grass that came into India as a contaminant with imported wheat.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341942
Viability of pollen grains depend upon
1 Prevailing temperature
2 A particular species
3 Humidity
4 All of the above
Explanation:
The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341943
A plant has \(2n = 28\). Their pollen grains are cultured to get callus by tissue cultured method. What would be the number of chromosomes in the cells of the callus
1 21
2 42
3 56
4 14
Explanation:
If plant has diploid\(\left( {2n = 28} \right)\),pollen grain are hoploid \(\left( {n = 14} \right)\).
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341944
In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?
1 25
2 50
3 75
4 100
Explanation:
Each MMC produces 4 pollen grains from 1 meiotic division. So to produce 100 pollen grains 25 meiotic divisions are required. \(\left( {25 \times 4 = 100} \right)\)
341941
Statement A : In over 60 per cent of angiosperms, pollen grains are shed at this 3-celled stage. Statement B : Parthenium or carrot came into India as a contaminant with imported wheat.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. Parthenium or carrot grass that came into India as a contaminant with imported wheat.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341942
Viability of pollen grains depend upon
1 Prevailing temperature
2 A particular species
3 Humidity
4 All of the above
Explanation:
The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341943
A plant has \(2n = 28\). Their pollen grains are cultured to get callus by tissue cultured method. What would be the number of chromosomes in the cells of the callus
1 21
2 42
3 56
4 14
Explanation:
If plant has diploid\(\left( {2n = 28} \right)\),pollen grain are hoploid \(\left( {n = 14} \right)\).
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341944
In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?
1 25
2 50
3 75
4 100
Explanation:
Each MMC produces 4 pollen grains from 1 meiotic division. So to produce 100 pollen grains 25 meiotic divisions are required. \(\left( {25 \times 4 = 100} \right)\)
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BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341941
Statement A : In over 60 per cent of angiosperms, pollen grains are shed at this 3-celled stage. Statement B : Parthenium or carrot came into India as a contaminant with imported wheat.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both Statements are correct.
4 Both Statements are incorrect.
Explanation:
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. Parthenium or carrot grass that came into India as a contaminant with imported wheat.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341942
Viability of pollen grains depend upon
1 Prevailing temperature
2 A particular species
3 Humidity
4 All of the above
Explanation:
The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity.
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341943
A plant has \(2n = 28\). Their pollen grains are cultured to get callus by tissue cultured method. What would be the number of chromosomes in the cells of the callus
1 21
2 42
3 56
4 14
Explanation:
If plant has diploid\(\left( {2n = 28} \right)\),pollen grain are hoploid \(\left( {n = 14} \right)\).
BIOXII02: SEXUAL REPRODUCTION IN FLOWERING PLANTS
341944
In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?
1 25
2 50
3 75
4 100
Explanation:
Each MMC produces 4 pollen grains from 1 meiotic division. So to produce 100 pollen grains 25 meiotic divisions are required. \(\left( {25 \times 4 = 100} \right)\)
