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

Geocarpic fruits are:

1. Carrot
2. Radish
3. Ground nut
4. Turnip

By which action a seed coat becomes permeable to water:

1. Scarification

2. Stratification

3. Vernalization

4. All of the above

Which of the following PGR is present in coconut milk which is used in tissue culture?

1. Cytokinin

2. Auxin

3. Gibberellin

4. Ethylene

Which pigment absorbs the red and far red light:

1. Cytochrome

2. Phytochrome

3. Carotenoids

4. Chlorophyll