Plant Growth and Development Test

Result

Plant Growth and Development Test - 80

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which one of the following nutrients is concerned with the growth of the plants in view of their role in synthesis of auxin?

A
S

B
Mn

C
Zn

D
K

Solution

Zinc is an important micronutrient mineral for plants. It is required as co-factor by alcohol dehydrogenase, carbonic anhydrase and others. It is also essential for auxin biosynthesis.
Thus, the correct answer is option C.
Question 2
1 / -0

Natural cell division inducing factor occurs in

A
Coconut milk

B
Immature maize seeds

C
Both (A) and (B)

D
None of the above

Solution

Cytokinins have specific effects on cytokinesis, and were discovered as kinetin (a modified form of adenine, a purine) from the autoclaved herring sperm DNA. Kinetin does not occur naturally in plants. Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk. Since the discovery of zeatin, several naturally occurring cytokinins, and some synthetic compounds with cell division promoting activity, have been identified. Natural cytokinins are synthesised in regions where rapid cell division occurs, for example, root apices, developing shoot buds, young fruits etc.
Question 3
1 / -0

Pruning of plants promotes branching, because the axillary buds get sensitized to

A
Ethylene

B
Gibberellin

C
Cytokinin

D
IAA

Solution

Cytokinin are a class of plant growth substance that promote cell division or cytokinesis in plant roots and shoots. They are involved primarily in cell growth and differentiation but also affects apical dominance, axillary bud growth and leaf sensecence. Pruning of plants promote branching because the axillary buds get sensitized to cytokinin.
Therefore, the correct answer is option C.
Question 4
1 / -0

The first cytokinin was discovered by

A
Skoog

B
Went

C
Addicott

D
Miller

Solution

The first cytokinin was isolated from herring sperm in 1955 by Miller. This compound was named as kinetin because of its ability to promote cytokinesis. Natural cytokinins are synthesized in regions where rapid cell division is occurring. e.g., root apices, developing shoot buds, young fruits etc.
Cytokinins overcome apical dominance. They promote nutrient mobilization that help in delay of leaf senescence.
Thus, the correct answer is option D.
Question 5
1 / -0

In tissue culture, differentiation of shoot is controlled by ...........................

A
Light Intensity

B
Temperature shock

C
Low Auxin and high CK $$\left (High\, \frac{Cyto}{Auxin}\, Ratio \right )$$

D
None of the above

Solution

Cytokinins promote cell division and differentiation of young, relatively unspecialized cells into mature, more specialized cells in intact plants. They are a required ingredient in any plant tissue culture medium and must be present for cells to divide. In tissue culture, cytokinins interact with auxin during the formation of plant organs such as roots and stems. For example, in tobacco tissue culture a high ratio of auxin to cytokinin induces root formation, whereas a low ratio of auxin to cytokinin induces shoot formation.
Question 6
1 / -0

First natural cytokinin was discovered by

A
Skoog and Miller

B
Letham

C
Benson and Calvin

D
Thimann and Went

Solution

The first cytokinin was isolated from herring sperm in 1955 by Miller and his associates . This compound was named kinetin because of its ability to promote cytokinesis. Hall and deRopp reported that kinetin could be formed from DNA degradation products in 1955. The first naturally occurring cytokinin was isolated from corn in 1961 by Miller. It was later called zeatin.
Therefore, the correct answer is option A.
Question 7
1 / -0

Bolting hormone is ...............................

A
Auxin

B
Gibberellin

C
ABA

D
Ethylene

Solution

Gibberellins are growth promoting phytohormones. Gibberellins promote stem elongation in many plants. When gibberellin is applied to a plant, particularly certain dwarf varieties, this elongation may be spectacular. Some corn and pea plants that are dwarfs as a result of one or more mutations grow to a normal height when treated with gibberellin. Short-stemmed, high-yielding varieties of wheat have short stems because they have a reduced response to gibberellin. These varieties put less of their resources into stem height and more resources into grain production. Gibberellins are also involved in bolting, the rapid elongation of a (leafless) floral stalk that occurs naturally in many plants when they initiate flowering, example cabbage.
Question 8
1 / -0

Which of the following hormones can replace vernalization?

A
Cytokinins

B
Auxins

C
Ethylene

D
Gibberellin

Solution

Gibberellins affect several reproductive processes in plants. They stimulate flowering, particularly in long-day plants. In addition, gibberellins substitute for the low temperature that biennials require before they begin flowering (vernalisation). If gibberellins are applied to biennials during their first year of growth, flowering occurs without exposure to a period of low temperature. Gibberellins, like auxin, also affect fruit development. Agriculturalists apply gibberellins to several varieties of grapes to produce larger fruits.
Question 9
1 / -0

The most common cytokinin is

A
IAA

B
Kinetin

C
Isopentanyl adenine

D
Dehydrozeatin

Solution

Cytokinins are plant hormones that induce cell division in the root and shoot tips and thus, promotes cell growth and differentiation. cytokinins are classified as isoprenoid or aromatic cytokinins. However, Isoprenoid cytokinins are most abundantly found in plants such as isopentanyl adenine.
Question 10
1 / -0

The formula of Auxin-A is

A
C$$_{18}$$H$$_{30}$$O$$_{7}$$

B
C$$_{10}$$H$$_{9}$$NO$$_{2}$$

C
C$$_{12}$$H$$_{30}$$O$$_{6}$$

D
C$$_{20}$$H$$_{30}$$O$$_{5}$$

Solution

Auxins are plant hormones and essential for the development of the plant as these play an important role in plant growth through cell elongation. On a molecular level, auxins are compounds with an aromatic ring and a carboxylic acid group and its chemical structure is indole -3-acetic acid (C₁₀H₉NO₂₎

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 80

Result

Plant Growth and Development Test - 80

Score

-

Rank

-

SHARING IS CARING

Question 1

S

Mn

Zn

K

Solution

Question 2

Coconut milk

Immature maize seeds

Both (A) and (B)

None of the above

Solution

Question 3

Ethylene

Gibberellin

Cytokinin

IAA

Solution

Question 4

Skoog

Went

Addicott

Miller

Solution

Question 5

Light Intensity

Temperature shock

Low Auxin and high CK $$\left (High\, \frac{Cyto}{Auxin}\, Ratio \right )$$

None of the above

Solution

Question 6

Skoog and Miller

Letham

Benson and Calvin

Thimann and Went

Solution

Question 7

Auxin

Gibberellin

ABA

Ethylene

Solution

Question 8

Cytokinins

Auxins

Ethylene

Gibberellin

Solution

Question 9

IAA

Kinetin

Isopentanyl adenine

Dehydrozeatin

Solution

Question 10

C$$_{18}$$H$$_{30}$$O$$_{7}$$

C$$_{10}$$H$$_{9}$$NO$$_{2}$$

C$$_{12}$$H$$_{30}$$O$$_{6}$$

C$$_{20}$$H$$_{30}$$O$$_{5}$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.