Plant Hormones

Q.

Differentiate between unconditioned and conditioned reflex.

Q. Bending of plant towards light is caused by:

1. Auxin
2. Cytokinin
3. Ethylene
4. Gibberellin

Q.

Which plant hormone helps in overcoming genetic dwarfism?

Q.

Match the following:-

1. 1-d, 2-a, 3-e, 4-a, 5-b

2. 1-c, 2-d, 3-a, 4-e, 5-b

3. 1-c, 2-d, 3-e, 4-a, 5-b

4. 1-b, 2-d, 3-a, 4-e, 5-c

Q.

Identify the pair that is correctly matched from the given.

Auxin – cell division
Gibberellin – internodal elongation
Cytokinin – fruit ripening
Ethylene – apical dominance

1. Auxin – cell division

2. Gibberellin – internodal elongation

3. Cytokinin – fruit ripening

4. Ethylene – apical dominance

Q. Growth of the stem is controlled by:

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

Q.

Find the odd one from the following: blinking, knitting without looking, smiling, blushing, crying.

Q.

Three sets of oat saplings named A, B and C were grown in different conditions in a box with a light from one side.
A: Tips were removed.
B: Tips were covered.
C: The saplings were left as they were.

Following observations were noted:-

i. Shoot bent towards the source of the light.
ii. Shoot growth ceased.
iii. Shoots grow normally in the vertical direction.

Match the seedlings with the correct observations.

1. A-(i), B–(ii), C-(iii)

2. A-(iii), B–(ii), C-(i)

3. A-(ii), B–(iii), C-(i)

4. A-(iii), B–(i), C-(ii)

Q.

What hormone induces pineapple flowering?

Q.

Ravi was walking very fast in his garden. Suddenly he started breathing heavily and so he decided to stop. Which muscles do you think are responsible for breathing heavily?

1. Voluntary muscles
2. Involuntary muscles
3. Both of these
4. None of these

Q.

A colourless gaseous plant hormone.

Q.

The hormone found in the form of gas is:

1. Ethylene

2. Zeatin

3. GA

4. IAA