Plant Growth and Development Test

Result

Plant Growth and Development Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

Gibberellin facilitates seed germination by triggering the synthesis of

A
$$\alpha$$-amylase

B
$$\beta$$-amylase

C
Both A and B

D
$$\alpha$$-amylase and protease

Solution

Gibberellic acid is a plant hormone which breaks the dormancy. Before the germination, starch nourishes seedling. It stimulates the synthesis of amylase enzyme in the aleurone cells of certain cereals. an alpha-amylase hydrolyzes starch into glucose which is used to provide nourishment to the seed embryo.
Thus, the correct answer is option A.
Question 2
1 / -0

Match the column I with column II
Column I Column II
A. Ethylene 1. Pigment
B. Cytokinin 2. Growth inhibitor
C. Phytochrome 3. Flowering hormone
D. Florigen 4. Zeatin

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

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

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

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

Solution

Column I Column II
Ethylene
Growth inhibitor
Cytokinin Zeatin
Phytochrome Pigment
Florigen Flowering hormone
Hence, correct option is C.
Question 3
1 / -0

One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation while the third increases the tolerance of plants to various stresses. They are respectively

A
Auxin, gibberellin, ABA

B
Gibberellin, auxin, ABA

C
Auxin, gibberellin, cytokinin

D
Gibberellin, auxin, cytokinin

Solution

Gibberellin is a plant hormone that is involved in various physiological processes of plants. It is involved in stem elongation, germination, flowering and leaf senescence. It hastens the maturity period in juvenile conifers. Auxin is a plant hormone that controls xylem differentiation. Abscisic acid is a plant hormone. It is also called as stress hormone as it increases the tolerance of plants in various stress condition.
Thus, the correct answer is option B.
Question 4
1 / -0

Bolting means

A
Elongation of stem in rosette plants

B
Dwarfing of stem

C
Increase in flowering

D
Appearance of flowers

Solution

GA is a plant hormone which helps in longitudinal growth of stem. The rapid stem elongation of rosette plant is called bolting. Bolting needs either long days or cold treatment. However, bolting can be induced artificially by the application of gibberellic acid under normal conditions
So, the correct answer is 'Elongation of stem in rosette plants'
Question 5
1 / -0

The primary and secondary growth of a shoot is inhibited by

A
Auxin

B
Gibberellin

C
Cytokinin

D
Abscisic acid

Solution

Abscisic acid is a plant hormone. It is growth inhibitor hormone. Its primary role is inhibition of growth of root, shoot, leaf, etc. It inhibits primary and secondary growth of shoot. During stress condition, its concentration increases.
Thus, the correct answer is option D.
Question 6
1 / -0

Which one is best to reduce the rate of water absorption and also acts as respiratory inhibitor?

A
IAA

B
KCM

C
Transpiration

D
Osmotic pressure of cell sap

Solution

IAA (indole acetic acid) is a respiratory inhibitor. Its application also reduces the rate of water absorption. Potassium cyanide is also a respiratory inhibitor. Transpiration facilitates the rate of absorption. The rate of water absorption increases with the gradual increase in osmotic pressure of cell sap of root hairs.
Thus, the correct answer is option A.
Question 7
1 / -0

Spraying sugarcane crop with a plant hormone increases length of plants and increases yield by as much as $$20$$ tonnes per acre. The hormone is

A
Gibberellin

B
Auxin

C
Cytokinin

D
ABA

Solution

Gibberellin or Gibberellic Acid is a plant growth hormone produced in the embryos, roots, and young leaves of plants.
It helps in the elongation of stems in dwarf plants. This ability to cause an increase in the length of the axis is used to increase the length of grapes stalks. It also causes fruits like apple to elongate and improve its shape.
Sugarcane stores carbohydrate as sugar in their stems. Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield by as much as 20 tonnes per acre.
So, the answer is A.
Question 8
1 / -0

The scientist Nitsch was able to get strawberries of different shapes by

A
Splitting the ovary

B
Removing the perianth

C
Selectively removing some carpels

D
Inserting an alcohol dipped needle into ovary

Solution

Strawberries develop from a single flower that is having multiple numbers of the gynoecium. Individual ovaries are called fruitlets and arranged around a thick part of the stem called receptacle. It is also called aggregate fruit. Other examples include raspberry, blackberry etc. In a young fruit, carpels are removed within a few days after pollination. Nitsch carefully removed the carpels in order to obtain differently shaped strawberries. It is because receptacle will not grow in the region where carpels are removed.
So the correct option is C
Question 9
1 / -0

Which can prevent, premature fruit fall?

A
$$GA_3$$

B
Zeatin

C
Ethylene

D
NAA

Solution

Auxin is a growth promoter, generally produced by the growing apex of stem and root of the plants.
The naturally produced auxin is Indole-3-Acetic Acid (IAA). Some of the synthetic auxins are Indole-3-butyric acid (IBA), 2,4-Dichlorophenoxy Acetic Acid (2,4-D), and Naphthalene acetic acid (NAA).
NAA (Naphthalene acetic acid) is used for preventing fruit drop in apples before they are ripe.
So, the answer is D.
Question 10
1 / -0

The aleurone synthesizes and secretes digestive enzymes that hydrolyse nutrients stored in the endosperm in the presence of.

A
Auxin

B
Gibberellin

C
Cytokinin

D
Ethylene

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	Column I		Column II
A.	Ethylene	1.	Pigment
B.	Cytokinin	2.	Growth inhibitor
C.	Phytochrome	3.	Flowering hormone
D.	Florigen	4.	Zeatin

Column I	Column II
Ethylene	Growth inhibitor
Cytokinin	Zeatin
Phytochrome	Pigment
Florigen	Flowering hormone

Plant Growth and Development Test - 66

Result

Plant Growth and Development Test - 66

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Question 1

$$\alpha$$-amylase

$$\beta$$-amylase

Both A and B

$$\alpha$$-amylase and protease

Solution

Question 2

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

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

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

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

Solution

Question 3

Auxin, gibberellin, ABA

Gibberellin, auxin, ABA

Auxin, gibberellin, cytokinin

Gibberellin, auxin, cytokinin

Solution

Question 4

Elongation of stem in rosette plants

Dwarfing of stem

Increase in flowering

Appearance of flowers

Solution

Question 5

Auxin

Gibberellin

Cytokinin

Abscisic acid

Solution

Question 6

IAA

KCM

Transpiration

Osmotic pressure of cell sap

Solution

Question 7

Gibberellin

Auxin

Cytokinin

ABA

Solution

Question 8

Splitting the ovary

Removing the perianth

Selectively removing some carpels

Inserting an alcohol dipped needle into ovary

Solution

Question 9

$$GA_3$$

Zeatin

Ethylene

NAA

Solution

Question 10

Auxin

Gibberellin

Cytokinin

Ethylene

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