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Growth of part X is...

Growth of part X is

A

chemotropism

B

thigmotaxis

C

geotropic

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
The pollen tube paves its way through the solid part of the stigma and style by secreting pectinases and hydrolytic enzymes. Pollen tube travels intercellularly and chemotropically along the concentration gradient of calcium -boron-inosital sugar complex.
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NCERT FINGERTIPS-SEXUAL REPRODUCTION IN FLOWERING PLANTS-Sexual Reproduction In Flowering Plants
  1. part of the gynoecium which receives the pollen is called

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  2. Refer to the given figure of egg apparatus showing entry of pollen tub...

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  3. Growth of part X is

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  4. Given below are the events that are observed in an artificial hybridis...

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  5. During the process of fertilisation the pollen tube of the pollen grai...

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  6. Fusion of one of the male gametes with egg nucleus is referred to as

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  7. Which of the following statements is/are correct ? (i) Endothecium ...

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  8. The total number of nuclei involved in double fertilisation in angiosp...

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  9. Which one of the following events takes place after double fertilisati...

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  10. Triple fusion in Capsella bursa pastoris is funsion of male gamete wit...

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  11. Double fertilisation was first discovered in 1898 byin Fritillaria and...

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  12. Study the following statements and select the correct option. (i) Ta...

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  13. Milk of tender coconut represents ------ and the surrounding white coc...

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  14. In the given diagram, X represents

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  15. Select the correct order of endosperm types.

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  16. If an endosperm cell of an angiospern contains 24 chromosomes, the num...

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  17. The cell of endosperm have 24 chromosomes. What will be the number of ...

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  18. In angiosperms, normally after fertilisation

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  19. The true embryo develops as a result of fusion of

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  20. Father of India embryology is

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