Absissic Acid

Q.

Why abscisic acid is also known as stress hormone?Explain.

Q.

What are the commercial uses of auxin?

Q.

Which plant hormone is responsible for the opening of stomata?

Q. Plant growth is generally indeterminate because

1. Different parts of a plant will be at different stages of growth and development

2. All of these

3. Trees continue to increase in height and girth and leaves, flowers and fruits appear and fall periodically

4. At any given time plant consists of embryonic organs, developing organs, mature organs, senescent organs and even dead tissue

Q. Statement 1: Plants do not have any nervous system.
Statement 2: Plants have hormones which help in control and coordination.

1. Only 1 is correct
2. Both 1 & 2 are correct
3. Only 2 is correct
4. 1 is incorrect & 2 is correct

Q.

What is colchicine?

Q.

By inducing dormancy, abscisic acid helps seeds to withstand extreme conditions.

1. True

2. False

Q.

Which type of tissue synthesizes ethylene in larger quantities?

Q.
With reference to the above diagram, answer the questions that follow.
1 - Name the enzymes
2 - Identify the cells
3 - Name the cell
4 - Identify the particular step in somatic hybridization
5 - Identify the cell

1. 1 - Cellulase/pectinase, 2 - Protoplasts, 3 - Heterokaryon, 4 - Cell wall regeneration, 5 - Callus
2. 1 - Chitinase/pectinase, 2 - Protoplasts, 3 - Heterokaryon, 4 - Cell wall regeneration, 5 - Callus
3. 1 - Cellulase/chitinase, 2 - Heterokaryon, 3 - Protoplast, 4 - Callus, 5 - Cell wall regeneration
4. 1 - Cellulase/protease, 2 - Chloroplasts, 3 - Heterokaryon, 4 - Cell wall regeneration, 5 - Callus

Q. Write a brief account of abscisic acid.

Q.

In plants , the role of abcisic acid is

Q. Regarding assertion and reason, choose the correct option.
Assertion [A]: Small plant tissues can regenerate whole plants in-vitro.
Reason [R]: Plant cells are totipotent.

1. Both A and R are true and R explains A
2. Both A and R are true but R does not explain A
3. Both A and R are false
4. A is true and R is false

Q.

What is the function of gibberellin?

Q.

Name any phytohormone which acts as a growth inhibitor.

Q.

GA, GA₂, GA₃ and so on are _________ .

Q. Based on the image choose the correct option.

1. 1 - Explant, 2 - Organogenesis, 3 - Regeneration, 4 - Plant tissue culture
2. 1 - Explant, 2 - Callus, 3 - Organogenesis, 4 - Plant tissue culture
3. 1 - Explant, 2 - Callus, 3 - Somatic embryogenesis, 4 - Regeneration
4. 1 - Explant, 2 - Callus, 3 - Somatic embryogenesis, 4 - Plant tissue culture

Q. Abscisic acid is a growth inhibiting hormone. How is it useful to the plants?

Q. Match List I and List II and select the correct option.

	List I		List II
A	Auxin	1	Herring sperm DNA
B	Cytokinin	2	Inhibitor of growth
C	Gibberellin	3	Apical dominance
D	Ethylene	4	Epinasty
E	Abscisic acid	5	Induces amylase synthesis

1. A- 3, B- 1, C- 5, D- 4, E- 2
   
2. A- 1, B- 2, C- 3, D- 4, E- 5
3. A- 5, B- 4, C-2, D- 3, E- 1
4. A- 2, B- 3, C- 1, D- 4, E- 5

Q. Which one of the following plant hormones (phytohormone) is known as a stress hormone?

1. Gibberellins
2. Kinetin
3. Auxin
4. Abscisic acid

Q. ABA(Abscisic acid) is called a stress hormone. How does this hormone overcome stress conditions?

Q.
With reference to the above diagram answer the questions that follow.
1 - Name the enzymes
2 - Identify the cells
3 - Name the cell
4 - Identify the particular step in somatic hybridisation
5 - Identify the cell

1. 1 - Cellulase/pectinase, 2 - Protoplasts, 3 - Heterokaryon, 4 - Cell wall regeneration, 5 - Callus
2. 1 - Chitinase/pectinase, 2 - Protoplasts, 3 - Heterokaryon, 4 - Cell wall regeneration, 5 - Callus
3. 1 - Cellulase/protease, 2 - Chloroplasts, 3 - Heterokaryon, 4 - Cell wall regeneration, 5 - Callus
4. 1 - Cellulase/chitinase, 2 - Heterokaryon, 3 - Protoplast, 4 - Callus, 5 - Cell wall regeneration

Q. Assertion :Abscisic acid (ABA) is also called stress hormone. Reason: ABA increases the tolerance of plants to various kinds of stresses.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Ageing in plants can be delayed by spraying:

1. Gibberellins

2. Cytokinins

3. Ethylene

4. Auxins

Q. ABA(Abscisic acid) is called a stress hormone. From where does this hormone get released in leaves?

Q. Match the items in Column I with Column II and choose the correct option.

	List I		List II
A	Human urine	1	Cytokinin
B	Gibberella fujikuroi	2	Auxin
C	Herring fish DNA	3	Ethylene
D	Ripening fruits	4	Abscisic acid
E	Aged leaves of plants	5	Gibberellins

1. A- 2, B- 5, C- 1, D- 3, E- 4
   
2. A- 1, B- 2, C- 3, D- 4, E- 5
3. A- 3, B- 5, C- 1, D- 2, E- 4
4. A- 5, B- 2, C- 1, D- 3, E- 4

Q. Hormone which helps in the closing of stomata is

1. Auxin
2. Ethylene
3. Cyto kinin
4. Abscisic acid

Q.

Q. Leaf abscission, fruit fall, bud dormancy occurs by which phytohormone?

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

Q. Seed dormancy is caused by ______________.

1. $C_2{H}_4$
2. ABA
3. IAA
4. $G{A}_3$.

Q. Which one of the following generally act as an antagonists to gibberellins?

1. Ethylene
2. IAA
3. Zeatin
4. ABA