Plant Growth and Development Test

Result

Plant Growth and Development Test - 75

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Weekly Quiz Competition

Question 1
1 / -0

The form of pigment which inhibits germination is

A
P760

B
P730

C
P650

D
All of these

Solution

The form of the pigment which inhibits germination is P730.
Question 2
1 / -0

The birth and death rates of four countries are given below. Which one will have the least population growth rate?
Country Birth rate/1000 Death rate/1000
P 15 5
Q 25 10
R 35 18
S 48 41

A
P

B
Q

C
R

D
S

Solution

Growth rate = Birth rate - death rate
For country P, it is 10/1000. For country Q, It is 15/1000
For country R, it is 17/1000. For country S, It is 7/1000
Hence, country S has the least population growth rate
Question 3
1 / -0

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of

A
NAA, $$2, 4 -D$$

B
phenyl acetic acid

C
cytokinin

D
none of these.

Solution

Plants which are difficult to flower can be made to do so by spraying them with 2,4,-D (2,4, – dichlorophenoxy acetic acid) and NAA (napthalene acetic acid) which are synthetic auxins, e.g., litchi, pineapple. However, some exogenously synthesized auxins, especially 1-naphthaleneacetic acid (NAA) and indole-3-butyric acid (IBA), are also commonly applied to stimulate root growth when taking cuttings of plants or for different agricultural purposes such as the prevention of fruit drop in orchards.

So the correct option is 'NAA, 2,4−D'.
Question 4
1 / -0

Choose the correct answer among the alternatives given :
The graph below shows the relationships of per capita population growth rate (r), fecundity (b) and age at first reproduction ($$\alpha$$) in an animal species:
What is the most important conclusion to be drawn from the graph?

A
The population growth rate decreases as first reproduction is postponed to a later stage, regardless of the fecundity.

B
At any $$\alpha$$, the higher the fecundity, the higher is the population growth rate achieved.

C
As the age at first reproduction is postponed further, the benefits of increasing fecundity on the population growth rate become progressively negligible.

D
None of these

Solution

Fecundity is the reproductive output, usually of an individual, or number of offspring produced or the capacity of reproduction. In the given curve, the population growth rate decreases as first reproduction is postponed to a later stage regardless of fecundity.
Question 5
1 / -0

Ageing is retarted by

A
ABA

B
CKN

C
GA

D
C2H4

Solution

Ageing is retarded by the CKN.
Ageing is the process in which the human being progressively more likely to die. So, Ageing is retarded by CKN.
Hence, option B is correct.
Question 6
1 / -0

Because of the which of the following reason/s, growth stops completely during the stationary phase?

A
Lack of nutrients

B
Saturation of nutrients

C
Over availability of nutrients

D
None of the above

Solution

The stationary phase is the phase in which the growth of lant generally stops and the plant proceeds towards maturity it may occur due to the lack of nutrients majorly seen in the unfavourable season.
So, the correct option is 'Lack of nutrients'.
Question 7
1 / -0

If there is a leaf at a node bearing a single branch in its axil, a transverse section of the node shows the vascular system of the main stem, then the

A
Leaf trace, leaf gap, branch trace and finally the branch gap

B
Branch gap, branch trace, leaf gap and finally the leaf trace

C
Branch gap, leaf gap, leaf trace and finally the branch trace

D
Branch trace, leaf gap, branch gap and finally the leaf trace
Solution
After the vascular bundle we find
Branch gap is the parenchymatous area in the vascular cylinder of stem at the node .
Branch trace is the area related with the formation of a break in the vascular cylinder around and above the point of departure of trace.
leaf gap is the space through which leaf grows.
leaf is connected to stem by leaf trace.
So the correct option is "Branch gap,branch trace ,leaf gap and finally the leaf trace".
Question 8
1 / -0

Which of the following is stress hormone?

A
$$ABA$$

B
$$C_2H_4$$

C
$$GA_7$$

D
$$IAA$$

Solution

Abscisic acid (ABA) is called stress hormone in plants. During stress conditions, it induces certain responses like closure of stomata during water crisis, promoting seed dormancy etc during unfavourable conditions etc. So, the correct answer is, 'ABA'.
Question 9
1 / -0

Which of the following plant growth response is primarily due to the action of auxins?

A
Cell elongation

B
Leaf abscission

C
Cell division

D
Fruit development
Solution
Auxin has the following function in plants:-
Cell elongation.
Abscission.
Apical dominance.
Cell division.
Xylem differentiation.
But its main function is the cell elongation of the shoot and root and promotes cell enlargement.
So the correct option is 'Cell elongation'.
Question 10
1 / -0

Growth in plant is :

A
only determine

B
only indeterminate

C
Mostly determinate

D
Open (both determinate and indeterminate)

Solution

In plants, stem grows continuously. it is indeterminate growth. but leaves, flowers, fruits grow only for sometime. It is determinate growth.
So the correct option is 'open(determinate and indeterminate).

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Country	Birth rate/1000	Death rate/1000
P	15	5
Q	25	10
R	35	18
S	48	41

Plant Growth and Development Test - 75

Result

Plant Growth and Development Test - 75

Score

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Rank

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SHARING IS CARING

Question 1

P760

P730

P650

All of these

Solution

Question 2

P

Q

R

S

Solution

Question 3

NAA, $$2, 4 -D$$

phenyl acetic acid

cytokinin

none of these.

Solution

Question 4

The population growth rate decreases as first reproduction is postponed to a later stage, regardless of the fecundity.

At any $$\alpha$$, the higher the fecundity, the higher is the population growth rate achieved.

As the age at first reproduction is postponed further, the benefits of increasing fecundity on the population growth rate become progressively negligible.

None of these

Solution

Question 5

ABA

CKN

GA

C2H4

Solution

Question 6

Lack of nutrients

Saturation of nutrients

Over availability of nutrients

None of the above

Solution

Question 7

Leaf trace, leaf gap, branch trace and finally the branch gap

Branch gap, branch trace, leaf gap and finally the leaf trace

Branch gap, leaf gap, leaf trace and finally the branch trace

Branch trace, leaf gap, branch gap and finally the leaf trace

Solution

Question 8

$$ABA$$

$$C_2H_4$$

$$GA_7$$

$$IAA$$

Solution

Question 9

Cell elongation

Leaf abscission

Cell division

Fruit development

Solution

Question 10

only determine

only indeterminate

Mostly determinate

Open (both determinate and indeterminate)

Solution

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