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[A] : Thorns may bear nodes and internod...

[A] : Thorns may bear nodes and internodes in some plants.
[R] : Thorns are modified stems as they arise in the axil of a leaf or at the apex a branch.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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TRUEMAN BIOLOGY-Plant Morphology & Reproduction -ASSERTION AND REASON
  1. [A] : Stilt roots are common in sugarcane, [R] : In sugarcane, thes...

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  2. [A] : In creepers, leaves are produced upon the nodes. [R] : Advent...

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  3. [A] : Thorns may bear nodes and internodes in some plants. [R] : Tho...

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  4. [A] : The switchover from vegetative to reproductive phase is now poss...

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  5. [A] : Insectivorous plants grow in carbohydrate deficiend soil. [R] ...

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  6. [A] : Synandrous condition is found in curcurbits. [R] : The male fl...

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  7. Assertion. Dispersal of fruits in Xanthium takes place by wind and wat...

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  8. [A] : For dispersal by wind fruits and seeds should be light. [R] : ...

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  9. [A] : Xenogamy is defined as the transferance of pollen grain to stigm...

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  10. [A] : Anemophillous plants have to produce enormous quantities of poll...

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  11. [A] : Bees are colour-blind for red and are fond of yellow, violet and...

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  12. Assertion. The time involved between pollination and fertilization var...

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  13. [A] : The presence of endothelium around the embryo sac and its cytolo...

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  14. [A] : Synergids play an important role in directing the pollen tube gr...

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  15. Assertion. In apomixis , plants of new genetic sequence are produced. ...

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  16. [A] : Nucleus of pollen grain divides meiotically and form a pollen tu...

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  17. [A]: Incompatibility is a gene physiological process. [R]: Moderate...

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  18. [A]: The pollen sterility has been attributed to the malfunctioning of...

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  19. [A]: The three cells of the egg apparatus are arranged in a triangular...

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  20. [A]: Pollen grains from male parent are mostly transferred to the stig...

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