In a flowering plant if auxins are not synthesizing, then effects which would most probably be seen in this plant are
i. Dropping of fruits at early stage.
ii. Inhibition in the growth of lateral buds.
iii. Delayed abscission of older mature leaves.
iv. Inhibition of cell division in cambium.

1. i, ii and iv

2. i, iii and iv

3. ii and iv only

4. i and iii only

Select the correct match
1. Auxin – Promote seed dormancy
2. Cytokinin – Overcoming apical dominance
3. Ethylene – Bolting in beet
4. GA₃ – Thinning of cherry and walnut

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

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

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.