What is necessary for ripening of fruits:
1.  80% of ethylene
2.  Abscisic acid
3.  2, 4 D
4.  A.M.O. – 16

Which of the following induces morphogenesis in tissue culture:
1.  Gibberellin
2.  Cytokinin
3.  IAA
4.  Ethylene

Which weedicide can defoliate the complete forest:
1.  2, 4-D
2.  AMO–1618
3.  MH
4.  ABA

Agent orange is:

Effect of light and dark rhythm on plants is known as:
1.  Photonasty
2.  Phototropism
3.  Photoperiodism
4.  Photomorphogenesis

Growth of leaf primordia is:
1. First apical then marginal
2. Only apical
3. Only marginal
4. Lateral

What is a phytotron:

Exponential growth is shown by:
1.  Unicellular forms
2.  A cell in tissue culture
3.  Embryo
4.  Multicellular plants

If the apical bud has been removed then we observe:

1. More lateral branches

2. More axillary buds

3. Plant growth stops

4. Flowering stops

Which hormone is responsible for fruit ripening:

1. Ethylene

2. Auxin

3. Ethyl chloride

4. Cytokinin