Plant Growth and Development Test

Result

Plant Growth and Development Test - 31

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

Directions For Questions

The diagram given above indicates some experiments done by Went with coleoptiles oat seedlings. A coleoptile grown in darkness was decapitated and the tip was kept on a block agar for a few minutes. A indicates the agar block placed sideways on another decapitated coleoptile. B indicates the control for this experiment.

...view full instructions

What is the substance that was discovered by these experiments?

A
GA

B
Auxin

C
Both above

D
None of the above

Solution

In the given experiment the activity of phytohormone auxin is studied. The bioassay conducted for auxin is called as avena coleoptile curvature test. It exhibits apical dominance and random cell division.
Question 2
1 / -0

Directions For Questions

The diagram given above indicates some experiments done by Went with coleoptiles oat seedlings. A coleoptile grown in darkness was decapitated and the tip was kept on a block agar for a few minutes. A indicates the agar block placed sideways on another decapitated coleoptile. B indicates the control for this experiment.

...view full instructions

Why is this experiment carried out in the dark?

A
To prevent the effect of temperature on plant

B
To prevent the effect of light on the distribution of auxin.

C
Both above

D
None of the above
Question 3
1 / -0

Which one of these is a herbicide?

A
IAA

B
NAA

C
2,4-D

D
$${G_3}$$

Solution

2,4-Dichlorophenoxyacetic acid is usually called as 2,4-D. It is a systemic herbicide used in the control of broad leaf weeds. It is one of the most widely used herbicides in the world. 2,4-D is a synthetic auxin and as such it is often used in laboratories for plant research and as a supplement in plant cell culture media such as MS medium. 2,4-D was one of the ingredients in Agent Orange, the herbicide widely used during the Vietnam war.
Question 4
1 / -0

The most efficient precursor of ethylene is ................

A
Adenine

B
Thiocarbarnate

C
Zeatin

D
Methionine

Solution

Ethylene is a plant hormone which is present in gaseous form. It is formed by the breakdown of methionine, which is in all cells. Thus, methionine is called as the precursor of ethylene hormone. Ethylene hormones helps in the ripening of fruits when sprayed onto it. Ethylene hormone is present mainly in rapidly dividing cells, which is usually in darkness due to the action of methionine, which is the precursor molecule.
Question 5
1 / -0

Bakanae disease was reported to be due to ................

A
Fungal toxin

B
Growth hormone released by fungal infection

C
Inadequate nutrients

D
Change in photoperiods

Solution

Bakane disease is also called as 'Foolish seedling disease'. It was first observed in Japan and is a common seedling disease in rice caused by the fungus Fusarium fujikori. Infected seedlings exhibit abnormal elongation and in severe cases stunting leading to death.
Question 6
1 / -0

Auxin causes cells to absorb water from hypertonic media because ........

A
It lowers transpiration rate.

B
It increases rate of cellular respiration causing more production of ATP molecules, thus, facilitating active water absorption.

C
It increases solute potential of the cells.

D
It increases rate of transpiration.

Solution

Auxin is the phytohormone which causes cells to absorb water from hypertonic media because it increases solute potential of the cells. A significant level of activity of auxins on the elongation of plant cells occurs through its influence on the cell wall.
Question 7
1 / -0

Directions For Questions

The diagram given above indicates some experiments done by Went with coleoptiles oat seedlings. A coleoptile grown in darkness was decapitated and the tip was kept on a block agar for a few minutes. A indicates the agar block placed sideways on another decapitated coleoptile. B indicates the control for this experiment.

...view full instructions

How is the agar block shown in B different from that shown in A?

A
B contains auxin.

B
B contains cytokinin.

C
B contains GA

D
None of the above

Solution

In the given experiment, it is mentioned that plant B is kept as control. That means B is not provided with auxin. It helps in tracing the activity of plant A, keeping the plant B as standard.
Question 8
1 / -0

What should a gardener do to induce flowering in Chrysanthemum?

A
Apply gibberellins

B
Cut off tip

C
Apply 2,4 D

D
Supply lot of water

Solution

Induction of flowering in Chrysanthemum is possible by providing gibberellins. The gibberellin class of plant hormones has been implicated in the control of flowering in several species. In Arabidopsis, severe reduction or endogenous gibberellins delays flowering in long days and prevents flowering in short days. The gibberellin class of plant hormones plays a role in many processes during plant development, including seed germination, cell elongation and flowering.
Question 9
1 / -0

Richmond-Lang's effect is controlled by

A
Cytokinin

B
Auxin

C
GA

D
ABA

Solution

Richmond Lang effect is the retardation of aging due to cytokinins which acts by retarding the rate of destruction of chlorophyll and yellowing of leaves.
Question 10
1 / -0

Which one of the following is not true about kinetin?

A
It promotes bud growth.

B
It defers senescence.

C
It helps in retention of chlorophyll.

D
It inhibits the cell division.

Solution

Kinetin is a type of cytokinin, a class of plant hormone that promotes cell division. Kinetin was originally isolated by Miller and Skoog et al as a compound from autoclaved herring sperm DNA that had cell division-promoting activity.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Plant Growth and Development Test - 31

Result

Plant Growth and Development Test - 31

Score

-

Rank

-

SHARING IS CARING

Question 1

GA

Auxin

Both above

None of the above

Solution

Question 2

To prevent the effect of temperature on plant

To prevent the effect of light on the distribution of auxin.

Both above

None of the above

Question 3

IAA

NAA

2,4-D

$${G_3}$$

Solution

Question 4

Adenine

Thiocarbarnate

Zeatin

Methionine

Solution

Question 5

Fungal toxin

Growth hormone released by fungal infection

Inadequate nutrients

Change in photoperiods

Solution

Question 6

It lowers transpiration rate.

It increases rate of cellular respiration causing more production of ATP molecules, thus, facilitating active water absorption.

It increases solute potential of the cells.

It increases rate of transpiration.

Solution

Question 7

B contains auxin.

B contains cytokinin.

B contains GA

None of the above

Solution

Question 8

Apply gibberellins

Cut off tip

Apply 2,4 D

Supply lot of water

Solution

Question 9

Cytokinin

Auxin

GA

ABA

Solution

Question 10

It promotes bud growth.

It defers senescence.

It helps in retention of chlorophyll.

It inhibits the cell division.

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.