Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:

1.	Gibberellins prevent bolting and are inactivated.
2.	Auxins prevent leaf drop at early stages.
3.	Effect of auxins is removed and the growth of lateral buds is enhanced.
4.	Gibberellins delay the senescence of leaves.

In order to increase the yield of sugarcane crops, which of the following plant growth regulators should be sprayed?

Select the correct match

In a flowering plant if auxins are not synthesizing, then effects which would most probably be seen in this plant are

How many of the following can help in breaking seed dormancy?
1. Changing the environmental condition like light & temperature.
2. Application of GA₃ or nitrates.
3. Chilling condition.
4. All the above

The phytohormone which promotes rapid internode elongation in deep water rice plant is

Ethephon hastens the fruit ripening in tomatoes and apple and accelerates abscission in flowers and fruits. Above statement indicates that ethephon must release –

1. ABA                                                          
2. C₂H₄
3. IAA                                                          
4. GA₇

Vernalisation stimulates flowering in

1. Zamikand

2. Turmeric

3. Carrot

4. Ginger

Which of the following is not a natural mean to remove seed coat?

What conditions are required for vernalisation in
plants?

1. Low temperature, CO₂.
2. Low temperature, O₂, leaf.
3. Optimum temperature, O₂.
4. Low temperature, O₂.