Agent orange is:
1.  Biodegradable insecticide
2.  Di auxin (2–4,D and 2, 4, 5 T) weedicide
3.  Biofertilizer
4.  Biopesticide

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

One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set, the night phase was interrupted by a flash of light and it did not produce a flower. Under which one of the following categories will you place this plant?

1. Darkness neutral

2. Day neutral

3. Short day

4. Long day

The maximum growth rate occurs in:

1. Senescent phase

2. Lag phase

3. Exponential phase

4. Stationary phase 

Cell elongation in internodal regions of the green plants takes place due to:

What is a phytotron:
1.  A device to grow the plants in a controlled environment
2.  Growing plants in greenhouse
3.  Radiation chamber to induce the mutations
4.  Apparatus to study the effect of light on plants

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