Cytokinin

Q.

Which one of the following generally acts as an antagonist to gibberellins?

1. Ethylene

2. Zeatin

3. IAA

4. ABA

Q.

Name the plant growth regulators which upon spraying on sugarcane crops increase the length of the stem, thus increasing the yield of sugarcane crops?

1. Ethylene

2. Abscisic acid

3. Cytokinin

4. Gibberellin

Q.

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. Auxin and cytokinin

2. IAA and gibberellin

3. Gibberellin and abscisic acid

4. Auxin and abscisic acid

Q.

What factors influence plant growth?

Q. Kinetin was discovered from the ______________

1. foolish seedlings of rice
2. coleoptile of canary grass
3. human urine
4. autoclaved herring sperm DNA

Q.

Name a few plant growth promoters.

Q.

Which plant growth hormones are highly required for cell growth?

Q. The kinetin which was isolated from herring sperm DNA by Skoog & Miller was

1. Diterpenoid
2. Sesquiterpene
3. PAA
4. $N^6$ - Furfuryl amino purine

Q.

What are growth inhibitors in humans?

Q. The precursor of cytokinins is ______.

1. Adenosine monophosphate (AMP)
2. Acetyl CoA
3. Isopentenyl pyrophosphate
4. Both A $\&$ C

Q. Which of the following plant growth regulators should be used to delay senescence in plants?

1. Gibberellin and ethylene
2. Ethylene and cytokinin
3. Cytokinin and gibberellin
4. None of the above

Q. Richmond Lang effect is shown by:

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

Q. The kinetin which was isolated from herring sperm DNA by Skoog & Miller was

1. Diterpenoid
2. Sesquiterpene
3. PAA
4. $N^6$ - Furfuryl amino purine

Q. ____________ identified and crystallized the cytokinesis promoting active substance called kinetin.

1. F.W.Went
2. Miller
3. E.Kurosawa
4. H.H.Cousins

Q.

________promote growth of shoot tip and apical dominance.

Q. Match the following:
$\begin{array}{cc}\text{Plant Growth Regulators}& \text{Functions}\\ \text{1.2, 4-D}& \text{A.Used to speed up the malting process}\\ \text{2.Kinetin}& \text{B.Promotes cell division}\\ \text{3.GA3}& \text{C. Used as weedicide}\end{array}$

1. 1-C, 2-B, 3-A
2. 1-A, 2-B, 3-C
3. 1-B, 2-A, 3-C
4. 1-C, 2-A, 3-B

Q.

Physiological effects of a phytohormone are given below

1. Cell division

2. Removal of apical dominance

3. Delay of senescence

4. Help in stomatal opening

Identify the phytohormone involved in the above processes

1. Auxins
2. Gibberellins
3. Cytokinins
4. Abscisic acid

Q. Which of the following hormones primarily helps in cell division?

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

Q. are synthesized in the region where rapid cell division occurs.

1. Natural cytokinins
2. Natural gibberellins
3. Semi-synthetic auxin
4. Natural auxin

Q. The precursor of cytokinins is ______.

1. Adenosine monophosphate (AMP)
2. Acetyl CoA
3. Isopentenyl pyrophosphate
4. Both A $\&$ C

Q. ____________ hormone helps in lateral shoot growth.

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