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Earn 100
Seed of Pinus shows three generations as
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Important Questions on Plant Kingdom
MEDIUM
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.
Reason R: Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.
In the light of the above statements, choose the correct answer from the options given below:
MEDIUM
MEDIUM
Xylem and phloem are main conducting elements.
Pollen grains are carried by wind.
Transfer of pollen is direct.
Ovules develop into seeds after fertilisation.
MEDIUM
Arrange the following plants with their respective classes in the same order. Sphenopsida, Psilopsida, Pteropsida, Lycopsida, Gnetopsida
A) Selaginella
B) Equisitum
C) Sphagnum
D) Adiantum
E) Psilotum
F) Gnetum
EASY
HARD
MEDIUM
EASY
Equal distribution of water and air in the habitat
Adaptation to excessive water and extensive dryness
Do not show adaptation to extensive dryness
Grow in excessive water and extensive dry areas
MEDIUM
MEDIUM
HARD
EASY
MEDIUM
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