Which of the following is not a use of plant PGR ethylene?
1. Initiation of flowering and synchronizing fruit set in pineapples.
2. Induction of flowering in mango.
3. Ethephon, most common source of ethylene, hastens fruit ripening in tomatoes.
4. Induction of parthenocarpy in tomatoes.

The ratio of cytokinins to auxin controls cell differentiation in a callus, if:

I. Auxin levels increase shoot buds develop from the callus

II. Cytokinins level increase, roots form

1. Only I is correct

2. Only II is correct

3. Both I and II are correct

4. Both I and II are incorrect

Match each item in Column I with one in Column II and select the correct match from the codes given:

Match the following concerning the activity/function and the phytohormone involved:-

Select the correct option from following:-

Parthenocarpy in tomato plants can be induced by:

Match each item in Column I with one in Column II and select the correct answer from the codes given:

Codes

Consider the given two statements:
I. 2,4-D [2,4-Dichlorophenoxyacetic acid] is widely used as a herbicide. 
II. 2,4-D acts by mimicking the action of the plant growth hormone auxin, which results in uncontrolled growth and eventually death in susceptible plants.

1. Both I and II are correct and II explains I

2. Both I and II are correct but II does not explain I

3. I is correct but II is incorrect

4. Both I and II are incorrect