Plant Growth and Development Test

Question 1
1 / -0

Which of the following test is performed to demonstrate the presence of gibberellin?

A
Bolting of cabbage

B
Differentiation of shoots in tobacco callus culture

C
Rapid division in carrot cells

D
Elongation of Avena coleoptile

Question 2
1 / -0

Which the following commercial application of phytohormones are correct?
A. Auxins are extensively used in agriculture to promote flowering in pineapples.
B. Ethephon is used for promoting female flower in cucumbers, thereby increase the yield.
C. Abscisic acid is of great use in the ripening the fruits like mango, orange, pineapple etc.
D. Cytokinins are used for keeping freshness in leafy and green vegetables.

A
a, b and c

B
b, c and d

C
a, c and d

D
a, b and d

Question 3
1 / -0

Coconut water is rich in

A
Auxins

B
Gibberellin

C
Abscisic acid

D
Cytokinin

Question 4
1 / -0

Identify the correct pair of statements.
(I) Lutein is an oxygenated hydrocarbon.
(II) Inhibition of bacteroid respiration by oxygen is referred to as 'Warburg effect'.
(III) Triplet code 'UAA' is called 'Amber'.
(IV) Delay of senescence by cytokinins is known as 'Richmond-Lang effect'.

A
(II), (III)

B
(I), (IV)

C
(I), (III)

D
(II), (IV)

Question 5
1 / -0

Which of the following is not an auxin?

A
IAA

B
IBA

C
Zeatin

D
NAA

Question 6
1 / -0

Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was most likely caused by an

A
Unequal distribution of auxin in the stem.

B
Unequal distribution of a neurotransmitter in the stem.

C
Equal distribution of auxin in the stem.

D
Equal distribution of a neurotransmitter in the stem.

Question 7
1 / -0

The bio-assay of auxin is

A
Avena curvature test

B
Callus formation

C
Culture of fungus

D
Seed dormancy

Question 8
1 / -0

Induction of cell division and delay in senescence is caused by

A
Cytokinin

B
IAA

C
Gibberellins

D
NAA

Question 9
1 / -0

Ethylene gas is a plant hormone that regulates plant growth, development and response to environmental stress. It is produced from leaves, roots, stems, flowers and especially ripened fruits. Like all hormones, ethylene functions via an intracellular signal transduction pathway, which is illustrated in Figure 1 above.

Figure 1. Signal transduction pathway of ethylene in plant cells. Key: 1. Ethylene Gas 2. Plasma Membrane 3. Receptor Protein 4. Endoplasmic Reticulum 5. Constitutive Triple Response Protein Kinase 1 (CTR1) 6. Ethylene Insensitive 2 protein (EIN2) 7. Ethylene Insensitive 3 protein (EIN3) 8. DNA 9. mRNA 10. Enzyme production

The biosynthesis of ethylene in plant cells occurs in a two-step biochemical pathway illustrated in Figure 2 below:

Figure 2. Ethylene biosynthesis starts when S-adenosyl-L-methionine (SAM) is converted to 1-aminocyclopropane-1-carboxylic acid (ACC) by the enzyme ACC synthase (ACS). ACC is then converted to ethylene by the enzyme ACC oxidase (ACO). The ACS and ACO genes are expressed in response to internal developmental cues and environmental stresses, such as wounding, flooding, drought, and pathogen attack.

The United States Department of Agriculture (USDA) estimates that farmers lose approximately 5% of their fresh fruit and vegetable stock due to spoilage, supermarkets lose an average of 10% and consumers lose an average of 30% (2005). It is, therefore, an economic necessity for the business and private sectors to control levels of ethylene around their fresh produce.

Of the methods described below, which one would not function to prevent the spoiling of fruits and vegetables during transport and storage?

A
Transport and store fruits and vegetables in cargo/storage space in a controlled atmosphere that removes ethylene from the air.

B
Expose fruits and vegetable to a chemical inhibitor of the ethylene receptor on the endoplasmic reticulum of cells.

C
Spray fruits and vegetables with an inhibitor of ACC synthase (ACS) or ACC oxidase (ACO).

D
Transport and store fruits and vegetables in a temperature-controlled cargo/storage space with an airtight seal.

Question 10
1 / -0

Which of the following plant hormones are synthetic?

A
2, 4-D

B
IAA

C
GA

D
ABA

Submit Test

Plant Growth an...

Question 1

Bolting of cabbage

Differentiation of shoots in tobacco callus culture

Rapid division in carrot cells

Elongation of Avena coleoptile

Question 2

a, b and c

b, c and d

a, c and d

a, b and d

Question 3

Auxins

Gibberellin

Abscisic acid

Cytokinin

Question 4

(II), (III)

(I), (IV)

(I), (III)

(II), (IV)

Question 5

IAA

IBA

Zeatin

NAA

Question 6

Unequal distribution of auxin in the stem.

Unequal distribution of a neurotransmitter in the stem.

Equal distribution of auxin in the stem.

Equal distribution of a neurotransmitter in the stem.

Question 7

Avena curvature test

Callus formation

Culture of fungus

Seed dormancy

Question 8

Cytokinin

IAA

Gibberellins

NAA

Question 9

Transport and store fruits and vegetables in cargo/storage space in a controlled atmosphere that removes ethylene from the air.

Expose fruits and vegetable to a chemical inhibitor of the ethylene receptor on the endoplasmic reticulum of cells.

Spray fruits and vegetables with an inhibitor of ACC synthase (ACS) or ACC oxidase (ACO).

Transport and store fruits and vegetables in a temperature-controlled cargo/storage space with an airtight seal.

Question 10

2, 4-D

IAA

GA

ABA

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