Plant Growth And Development Test 2: 17/11/12

10 Questions | By A_nagvenker | Last updated: Mar 4, 2013 | Total Attempts: 186

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1.

Ethylene is a:
- A.
  
  Gaseous enzyme
- B.
  
  Naturally occurring gaseous growth hormone or growth inhibitor or growth regulator
- C.
  
  Liquid gas mixture
- D.
  
  Solid hormone
2.

The chemical substance which helps in the formation of flowers in plants is:
- A.
  
  Florigen
- B.
  
  Fluorocarbon
- C.
  
  Auxin
- D.
  
  Gibberellic acid
3.

Gibberellin / Gibberellic acid has been successfully employed to induce flowering:
- A.
  
  In short day plants under long day conditions
- B.
  
  In long day plants under short day conditions
- C.
  
  For some plants
- D.
  
  None of the above
4.

Highest concentration of auxin exists in :
- A.
  
  At the base of various plant organs
- B.
  
  Growing tips of plants
- C.
  
  In leaves
- D.
  
  In xylem and phloem cells only
5.

Photoperiodism is:
- A.
  
  Growth curvature in response to light
- B.
  
  Recurrence of day and night
- C.
  
  Effect of day length on plant growth
- D.
  
  Flowering plant
6.

For rooting on stem cuttings or on leaves of Bryophyllum the growth regulator used is:
- A.
  
  Indole butyric acid / Auxin
- B.
  
  Gibberellic acid
- C.
  
  Carotene
- D.
  
  Lycopene
7.

Leaf aging is retarded by:
- A.
  
  Cytokinin
- B.
  
  Abscissic acid
- C.
  
  Florigen
- D.
  
  Auxin
8.

Hormone responsible for Vernalization is:
- A.
  
  Florigen
- B.
  
  Colchicine
- C.
  
  Abscission
- D.
  
  Vernalin
9.

In unisexual plants, sex can be changed by application of:
- A.
  
  Ethanol
- B.
  
  Auxins (or ethylene)
- C.
  
  Cytokinins
- D.
  
  ABA
10.

The stimulus of vernalization is received in annual and biennial plants by:
- A.
  
  Dry seeds
- B.
  
  Roots
- C.
  
  Stem apex
- D.
  
  Leaves

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