Abscisic Acid

Q.

Name the plant hormones responsible for the following

(a) elongation of cells

(b) growth of stem

(c) promotion of cell division

(d) falling of senescent leaves.

Q. Read the following statements (A-D).
(A) Colostrum is recommended for the new born because it is rich in antigens.
(B) Chikungunya is caused by a Gram negative bacterium.
(C) Tissue culture has proved useful in obtaining virus-free plants.
(D) Beer is manufactured by distillation of fermented grape juice.
How many statements are incorrect?

1. Two
2. Three
3. Four
4. One

Q. The gaseous plant growth regulator is used in plants to:

1. help overcome apical dominance
2. speed up the malting process
3. promote root growth and root hair formation to increase the absorption surface
4. kill dicotyledonous weeds in the fields

Q.

Which one is an antitranspirant hormone?

1. Auxin

2. Cytokinin

3. Gibberellin

4. Abscisic acid

Q. Which of the following plant growth regulator is a derivative of carotenoid?

1. Gibberellic acid
2. Cytokinin
3. Abscisic acid
4. Indole-3-acetic acid

Q. The antagonism between these two plant hormones plays a crucial role in controlling seed germination. Identify these plant growth regulators.

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

Q.

How is Abscisic Acid used in Agriculture?

Q.

Gibberellins cause bolting and flowering in rosette plants

1. True

2. False

Q. Which of the following pair of hormones are required for a callus to differentiate?

1. Auxin and cytokinin
2. Auxin and ethylene
3. Auxin and abscisic acid
4. Cytokinin and gibberellin

Q. Which one of the following is a natural growth inhibitor?

1. NAA
2. ABA
3. IAA
4. GA

Q.

What is the function of abscisic acid in plants?

Q. Which of the following PGR is also known as anti-gibberellin?

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

Q.

A plant hormone related with inhibition of senescence is

1. Ethylene

2. ABA

3. Bromic acid

4. GA

Q.

ABA causes temporary closure of stomata when there is a shortage of water because it

1. delays cell division & cell elongation

2. causes rapid abscission of leaves & flowers

3. interferes with the transport of $K^{+}$ ions into the guard cells

4. it stops mitosis in vascular cambium during winter season

Q.

____ is an antitranspirant.

Q. In animal cells, cytokinesis involves:

1. The separation of sister chromatids
2. The contraction of the contractile ring of microfilament
3. Depolymerisation of kinetochore microtubules
4. A protein kinase that phosphorylates other enzymes

Q.

What are recalcitrant seeds?

Q. Ethylene causes apical hook formation in dicot seedlings, promotes senescence and abscission of plant leaves and flowers.

1. True
2. False

Q.

1. Oxygen, suitable temperature and water
2. Good soil, suitable temperature and light
3. Good soil, Water and Air
4. All of the above

Q.

Does abscisic acid cause abscission?

Q. Which of the following statements is/are correct concerning seed dormancy?
I. It is a result of endogenous control.
II. Delayed germination is advantageous to plants.
III. Impermeable and hard seed coat results in the dormancy of the seed.

1. Only II
2. Only III
3. I and III
4. I, II and III

Q.

What is gibberellins effect on plant growth?

Q.

Premature leaf fall starts when the amount of

1. Auxin increases

2. Auxine decreases

3. Gibberellic acid decreases

4. Abscisic acid decreases

Q. Identify the hormones which inhibits growth in plants­-

Auxin, abscisic acid, gibberellin and cytokinin.

Q. Which of the following hormone is also called as antigibberellic hormone?

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

Q. Assertion: Biofortification is used to increase nutrient value of crops
Reason: Meristem culture is used to obtain virus resistant plants

1. Both assertion and reason are true and reason is the correct explanation of assertion
2. Both assertion and reason are true but reason is not the correct explanation of assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false

Q.

What is the function of abscisic acid?

Q.

---------phytohormone is a growth inhibitor

Q. Which one of the following pairs is wrongly matched

1. Penicillium ……conidia
2. Agave……bulbils
3. Bryophyllum…… leaf buds
4. Water hyacinth …. Runner

Q. Florigen results in conversion of

1. vegetative bud to lateral shoot
2. shoot apex to flowering bud
3. reproductive bud to vegetative bud
4. root apex to reproductive bud