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The growth of a pollen tube towards the ...

The growth of a pollen tube towards the ovule is caused by A) phototropism B) hydrotropism C) geotropism D) chemotropism

A

phototropism

B

hydrotropism

C

geotropism

D

chemotropism

Text Solution

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The correct Answer is:
C
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KUMAR PRAKASHAN-CONTROL AND COORDINATION-OBJECTIVE QUESTIONS AND ANSWERS (Select the correct alternative from those given below each question : )
  1. The roots of a plant are A) positive phototropic, but negative geotro...

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  2. The diagram shows a plant which has received light from one side only....

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  3. The growth of a pollen tube towards the ovule is caused by A) phototr...

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  4. For the synthesis of which of the following hormone is iodine necessar...

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  5. Which of the following hormone prepares our body for action in emergen...

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  6. Which is male sex hormone? a.Estrogen b.Adrenaline c.Testosterone d.P...

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  7. Which of the following endocrine gland does not occur as a pair in the...

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  8. Which of the following helps in maintaining posture and balance of the...

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  9. Which of the following plant shows immediate response to touch by its ...

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  10. By whom are the continuous heartbeats controlled ? a.Cerebrum b.Cerebe...

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  11. Where are the regulatory centres for the blood pressure located ? a. C...

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  12. Which of the following plant hormone helps in the growth of the stem ?...

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  13. Through whom does the impulse enter into the cyton? a. Dendrite b. A...

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  14. Which is the largest and the most complex part of the human brain? a....

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  15. Who regulates the involuntary reflexes such as coughing, sneezing, hic...

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  16. The deficiency of which hormone causes diabetes ? a. Estrogen b. Thyr...

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  17. Where is the arrangement in the body for reflex action? a. In medulla...

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  18. What is the main function of endocrine system in animals? A) Coordina...

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  19. Which ovarian hormone regulates menstrual cycle in women ? A) Testos...

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  20. Which gland is stimulated to release its secretion in a scary situatio...

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