286738
Assertion : Chlorella could be utilised to keep the air pure in space vehicles.
Reason : The space travellers feed on Chlorella soup.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Chlorella could be utilised to keep the air in space vehicles pure and supply food in space stations and prolonged space flight trips. The space travellers could feed on Chlorella soup. It is nourishing but not appetizing food.
NCERT Page-32/N-26
PLANT KINGDOM(NCERT)
286739
Assertion: The colour of brown algae varies from olive green to brown.
Reason: In brown algae, fucoxanthin is responsible for colour variation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d)Brown algae show a range of colour from olive green to various shades of brown depending upon the amount of fucoxanthin, xanthophyll pigment, present in them.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286740
Assertion: Archegonium is the female sex organ in bryophytes.
Reason: Algae also possess the archegonium.]#
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b)Archegonium is the female sex organ of the bryophytes. It appears for the first time in the liverworts and mosses and continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi).
PLANT KINGDOM(NCERT)
286741
Assertion: Liverworts fail to spread to a new locality through fragmentation.
Reason: Gemmae are helpful in propagating liverworts in different locality.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Fragmentation leads to an increase in the number of plants in a locality but it does not permit the spread of the plant to an entirely new locality. Gemmae are easily carried as they are small and sufficiently buoyant. They spread by water and wind currents to new habitats when detached, and each grows into a new individual immediately.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286742
Assertion: Selaginella and Salvinia are homosporous.
Reason: In Selaginella and Salvinia, different kind of spores are produced.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) All the spores are of similar kinds in majority of the pteridophytes; such plants are called homosporous. Genera like Selaginella and Salvinia produce two kinds of spores i.e. macro (large) spores and micro (small) spores, hence, are known as heterosporous.
286738
Assertion : Chlorella could be utilised to keep the air pure in space vehicles.
Reason : The space travellers feed on Chlorella soup.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Chlorella could be utilised to keep the air in space vehicles pure and supply food in space stations and prolonged space flight trips. The space travellers could feed on Chlorella soup. It is nourishing but not appetizing food.
NCERT Page-32/N-26
PLANT KINGDOM(NCERT)
286739
Assertion: The colour of brown algae varies from olive green to brown.
Reason: In brown algae, fucoxanthin is responsible for colour variation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d)Brown algae show a range of colour from olive green to various shades of brown depending upon the amount of fucoxanthin, xanthophyll pigment, present in them.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286740
Assertion: Archegonium is the female sex organ in bryophytes.
Reason: Algae also possess the archegonium.]#
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b)Archegonium is the female sex organ of the bryophytes. It appears for the first time in the liverworts and mosses and continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi).
PLANT KINGDOM(NCERT)
286741
Assertion: Liverworts fail to spread to a new locality through fragmentation.
Reason: Gemmae are helpful in propagating liverworts in different locality.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Fragmentation leads to an increase in the number of plants in a locality but it does not permit the spread of the plant to an entirely new locality. Gemmae are easily carried as they are small and sufficiently buoyant. They spread by water and wind currents to new habitats when detached, and each grows into a new individual immediately.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286742
Assertion: Selaginella and Salvinia are homosporous.
Reason: In Selaginella and Salvinia, different kind of spores are produced.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) All the spores are of similar kinds in majority of the pteridophytes; such plants are called homosporous. Genera like Selaginella and Salvinia produce two kinds of spores i.e. macro (large) spores and micro (small) spores, hence, are known as heterosporous.
286738
Assertion : Chlorella could be utilised to keep the air pure in space vehicles.
Reason : The space travellers feed on Chlorella soup.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Chlorella could be utilised to keep the air in space vehicles pure and supply food in space stations and prolonged space flight trips. The space travellers could feed on Chlorella soup. It is nourishing but not appetizing food.
NCERT Page-32/N-26
PLANT KINGDOM(NCERT)
286739
Assertion: The colour of brown algae varies from olive green to brown.
Reason: In brown algae, fucoxanthin is responsible for colour variation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d)Brown algae show a range of colour from olive green to various shades of brown depending upon the amount of fucoxanthin, xanthophyll pigment, present in them.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286740
Assertion: Archegonium is the female sex organ in bryophytes.
Reason: Algae also possess the archegonium.]#
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b)Archegonium is the female sex organ of the bryophytes. It appears for the first time in the liverworts and mosses and continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi).
PLANT KINGDOM(NCERT)
286741
Assertion: Liverworts fail to spread to a new locality through fragmentation.
Reason: Gemmae are helpful in propagating liverworts in different locality.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Fragmentation leads to an increase in the number of plants in a locality but it does not permit the spread of the plant to an entirely new locality. Gemmae are easily carried as they are small and sufficiently buoyant. They spread by water and wind currents to new habitats when detached, and each grows into a new individual immediately.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286742
Assertion: Selaginella and Salvinia are homosporous.
Reason: In Selaginella and Salvinia, different kind of spores are produced.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) All the spores are of similar kinds in majority of the pteridophytes; such plants are called homosporous. Genera like Selaginella and Salvinia produce two kinds of spores i.e. macro (large) spores and micro (small) spores, hence, are known as heterosporous.
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PLANT KINGDOM(NCERT)
286738
Assertion : Chlorella could be utilised to keep the air pure in space vehicles.
Reason : The space travellers feed on Chlorella soup.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Chlorella could be utilised to keep the air in space vehicles pure and supply food in space stations and prolonged space flight trips. The space travellers could feed on Chlorella soup. It is nourishing but not appetizing food.
NCERT Page-32/N-26
PLANT KINGDOM(NCERT)
286739
Assertion: The colour of brown algae varies from olive green to brown.
Reason: In brown algae, fucoxanthin is responsible for colour variation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d)Brown algae show a range of colour from olive green to various shades of brown depending upon the amount of fucoxanthin, xanthophyll pigment, present in them.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286740
Assertion: Archegonium is the female sex organ in bryophytes.
Reason: Algae also possess the archegonium.]#
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b)Archegonium is the female sex organ of the bryophytes. It appears for the first time in the liverworts and mosses and continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi).
PLANT KINGDOM(NCERT)
286741
Assertion: Liverworts fail to spread to a new locality through fragmentation.
Reason: Gemmae are helpful in propagating liverworts in different locality.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Fragmentation leads to an increase in the number of plants in a locality but it does not permit the spread of the plant to an entirely new locality. Gemmae are easily carried as they are small and sufficiently buoyant. They spread by water and wind currents to new habitats when detached, and each grows into a new individual immediately.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286742
Assertion: Selaginella and Salvinia are homosporous.
Reason: In Selaginella and Salvinia, different kind of spores are produced.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) All the spores are of similar kinds in majority of the pteridophytes; such plants are called homosporous. Genera like Selaginella and Salvinia produce two kinds of spores i.e. macro (large) spores and micro (small) spores, hence, are known as heterosporous.
286738
Assertion : Chlorella could be utilised to keep the air pure in space vehicles.
Reason : The space travellers feed on Chlorella soup.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Chlorella could be utilised to keep the air in space vehicles pure and supply food in space stations and prolonged space flight trips. The space travellers could feed on Chlorella soup. It is nourishing but not appetizing food.
NCERT Page-32/N-26
PLANT KINGDOM(NCERT)
286739
Assertion: The colour of brown algae varies from olive green to brown.
Reason: In brown algae, fucoxanthin is responsible for colour variation.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(d)Brown algae show a range of colour from olive green to various shades of brown depending upon the amount of fucoxanthin, xanthophyll pigment, present in them.
NCERT Page-32 / N-26
PLANT KINGDOM(NCERT)
286740
Assertion: Archegonium is the female sex organ in bryophytes.
Reason: Algae also possess the archegonium.]#
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(b)Archegonium is the female sex organ of the bryophytes. It appears for the first time in the liverworts and mosses and continues in the pteridophytes. Archegonium is absent in thallophytes (algae and fungi).
PLANT KINGDOM(NCERT)
286741
Assertion: Liverworts fail to spread to a new locality through fragmentation.
Reason: Gemmae are helpful in propagating liverworts in different locality.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(a) Fragmentation leads to an increase in the number of plants in a locality but it does not permit the spread of the plant to an entirely new locality. Gemmae are easily carried as they are small and sufficiently buoyant. They spread by water and wind currents to new habitats when detached, and each grows into a new individual immediately.
NCERT Page-35 / N-29
PLANT KINGDOM(NCERT)
286742
Assertion: Selaginella and Salvinia are homosporous.
Reason: In Selaginella and Salvinia, different kind of spores are produced.
1 Both (A) and (R) are correct but (R) is not the correct explanation of (A)
2 (A) is correct but (R) is not correct
3 (A) is not correct but (R) is correct
4 Both (A) and (R) are correct and (R) is the correct explanation of (A)
Explanation:
(c) All the spores are of similar kinds in majority of the pteridophytes; such plants are called homosporous. Genera like Selaginella and Salvinia produce two kinds of spores i.e. macro (large) spores and micro (small) spores, hence, are known as heterosporous.