Plant Growth and Development Test

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Plant Growth and Development Test - 84

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Weekly Quiz Competition

Question 1
1 / -0

Bakane disease is connected with discovery of

A
GA

B
IAA

C
ABA

D
2, 4-D

Solution

In 1930s Gibberellin (GA) was first isolated in Japan from a fungus that causes a serious disease in rice, called “foolish seedling disease” (bakanae-byo) by Japanese farmers.
So the correct option is 'GA'.
Question 2
1 / -0

Test Group 1 Test Group 2 Test Group 3
Pair of ripe apples One ripe apple, one unripe apple Pair of unripe apples
Presence of ethylene gas causes fruits to ripen. As fruit ripens, it produces increasing amounts of ethylene. An investigator placed fruit samples sealed containers as shown in the image, and left them for three days. At the end of the time period, the investigator used iodine to test for the presence of starch.

List these in order from highest to lowest starch content.

A
Group 1, Group 2, Group 3

B
Group 3, Group 2, Group 1

C
Group 1, Group 3, Group 2

D
Group 3, Group 1, Group 2

Solution

The iodine test is used to test Starch content. The solution of iodine contains, an aqueous solution of 1.8% iodine and 3.0% potassium iodide, binds with starch, producing a dark color. The fruits which show more stain the fruit shows, the more starch it contains and the less ripe it is.
So the correct option is 'Group 3, Group 2, Group 1.'
Question 3
1 / -0

The process of changing the form in order to carry out a specialized function is called _________.

A
Differentiation

B
Growth

C
Cell division

D
Cell elongation
Question 4
1 / -0

The aleurone synthesizes and secretes digestive enzymes that hydrolyze nutrients stored in the endosperm, in the presence of

A
Auxin

B
Gibberellin

C
Cytokinin

D
Ethylene

Solution

The aleurone layer is the outermost layer of the endosperm. It synthesizes and secretes digestive enzymes that hydrolyze nutrients stored in the endosperm in presence of enzyme gibberellin. Gibberellin is released by the embryo. The digestive enzymes hydrolyze the components stored in the endosperm to support the early growth of the embryo.
Thus, the correct answer is option B.
Question 5
1 / -0

Bakanae disease is caused by

A
Fungus

B
Alga

C
Bacterium

D
Virus

Solution

Bakanae disease is also called as foolish seedling disease. It affects the rice plant through the roots or crowns. It is caused by the fungus Gibberella fujikuroi. Affected seedlings show abnormal elongation and in severe cases may lead to death.
Thus, the correct answer is option A.
Question 6
1 / -0

Compare the statements I and II and choose correct option.
Statement (I) Auxin promotes apical dominance by suppressing the activity of lateral buds.
Statement (II) In moriculture, periodic prunning of shoot tips is done to make mulberry plants bushy.
Choose the correct options.

A
I is false, but II is true

B
II is false, but I is true

C
Both I and II are true

D
Both I and II are false
Solution
- Auxin is a plant growth hormone. This hormone is responsible for the growth and elongation of the shoot.
- There is apical dominance observed in the presence of auxin. This results in the growth of the central stem which is dominant and suppresses the growth of the lateral buds.
- The auxins are produced at the tips. The pruning of the tips is done where the branches are cut periodically in moriculture.
- This allows the lateral buds to grow and form branches. This helps to make the plant bushy.
Thus, the correct answer is option C.
Question 7
1 / -0

According to statolith theory, a plant distinguishes up from down by means of

A
Phytochrome

B
Amyloplasts

C
Auxin distribution

D
Ascent of sap

Solution

Statoliths are dense amyloplasts organelles that are involved in the gravitropism or graviperception. According to statolith theory, a plant distinguishes up from down by means of amyloplast. The statoliths sediment in response to the gravity. In shoots, it is present in starch sheath cells or endodermis cells. It is present in the root tip. Their sedimentation transmit signal for the auxin reorientation and redistribution which ultimately results in upwards growth of stem and downward growth of root.
So, the correct answer is 'Amyloplasts'
Question 8
1 / -0

$$2,4-D$$ causes

A
Delay in senescence

B
Bolting

C
Increase in branches

D
Increased growth of all parts

Solution

A 2, 4-D is a type of auxin, plant hormone. It is a weedicide. It kills the weeds by causing uncontrolled growth in stem. It mimics the action of auxin hormone. It stimulates increased uncontrolled growth of all parts of plants which ultimately results in death of plant.
Thus, the correct answer is option D.
Question 9
1 / -0

Bending of stem/coleoptile towards light or shoot of potted plant placed near a window is due to

A
Greater oxygen availability to the tip

B
More auxin content on the shaded side

C
Greater light availability to tip

D
Availability of necessary warmth to the tip

Solution

Auxin is a plant hormone that plays important role in phototropism, growth movement in response to light. It promotes cell elongation. It is unequally distributed in the plant cells. It is transported towards the shady side and thus present in higher concentration. However, less auxin is transported towards the illuminated side. Due to this, the plant to grow more on the shaded side and bend in the direction of the light source. It shows phototropic response where faster cell elongation is seen on the shaded side than on the illuminated side.
Thus, the correct answer is option B.
Question 10
1 / -0

Bioassay for gibberellin is

A
Avena curvature test

B
Seed dormancy test

C
Dwarf maize test

D
Green leaf test

Solution

There are various bioassay for gibberellin such as dwarf maize test, hypocotyl test, barely endosperm test, etc. Dwarf maize test is based on the principle that gibberellin causes elongation of the internodes. In maize, it also increases the length of the leaf sheaths surrounding the internodes. Length of the leaf sheath is directly proportional to the gibberellin concentration. Avena curvature test is a bioassay for auxin.
Thus, the correct answer is option C.

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Test Group 1	Test Group 2	Test Group 3
Pair of ripe apples	One ripe apple, one unripe apple	Pair of unripe apples

Plant Growth and Development Test - 84

Result

Plant Growth and Development Test - 84

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SHARING IS CARING

Question 1

GA

IAA

ABA

2, 4-D

Solution

Question 2

Group 1, Group 2, Group 3

Group 3, Group 2, Group 1

Group 1, Group 3, Group 2

Group 3, Group 1, Group 2

Solution

Question 3

Differentiation

Growth

Cell division

Cell elongation

Question 4

Auxin

Gibberellin

Cytokinin

Ethylene

Solution

Question 5

Fungus

Alga

Bacterium

Virus

Solution

Question 6

I is false, but II is true

II is false, but I is true

Both I and II are true

Both I and II are false

Solution

Question 7

Phytochrome

Amyloplasts

Auxin distribution

Ascent of sap

Solution

Question 8

Delay in senescence

Bolting

Increase in branches

Increased growth of all parts

Solution

Question 9

Greater oxygen availability to the tip

More auxin content on the shaded side

Greater light availability to tip

Availability of necessary warmth to the tip

Solution

Question 10

Avena curvature test

Seed dormancy test

Dwarf maize test

Green leaf test

Solution

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