Plant Growth and Development

The plant hormone used to destroy weeds in a field

1. IBA
2. IAA
3. NAA
4. 2, 4-D

Which of the following is not an inhibitory substance governing seed dormancy?

1. Para-ascorbic acid
2. Abscisic acid
3. Gibberellic acid
4. Phenolic acid

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop

1. Abscisic acid
2. Cytokinin
3. Gibberellin
4. Ethylene

The process of growth is maximum during

1. Log phase
2. Lag phase
3. Dormancy
4. Senescence

What is the site of perception of photoperiod necessary for induction of flowering in plants?

1. Shoot apex
2. Leaves
3. Lateral buds
4. Pulvinus

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

1. Gibberellin and Abscisic acid
2. Cytokinin and Abscisic acid
3. Auxin and Ethylene
4. Gibberellin and Cytokinin

Fruit and leaf drop at early stages can be prevented by the application of

1. ethylene
2. auxins
3. gibberellic acid
4. cytokinins.

The Avena curvature is used for bioassay of

1. IAA
2. ethylene
3. ABA
4. GA3.

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1. IAA and gibberellin
2. Auxin and cytokinin
3. Auxin and abscisic acid
4. Gibberellin and abscisic acid

Phytochrome is a

1. flavoprotein
2. glycoprotein
3. lipoprotein
4. chromoprotein