How do Organisms Reproduce Test

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How do Organisms Reproduce Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

Organisms in population A, have no genetic variations, and organisms of population B, have genetic variations. Based on this information, choose the correct statement.

A
Population A is more stable than population B.

B
Population B is more stable than population A.

C
Both population A and population B are stable.

D
Stability cannot be determined from the presence or absence of variations.

Solution

Population B is more stable than population A. Variation allows some individuals within a population to adapt to the changing environment. Because natural selection acts directly only on phenotypes, more genetic variation within a population usually enables more phenotypic variation. Some new alleles increase an organism’s ability to survive and reproduce, which then ensures the survival of the allele in the population.
Thus, the correct answer is option B.
Question 2
1 / -0

A plant produced $$50$$ flowers. Ovary of each flower has $$50$$ ovules. How many fruits and seeds are produced by that plant respectively?

A
$$50, 50$$

B
$$50, 100$$

C
$$50, 2500$$

D
$$2500, 2500$$
Question 3
1 / -0

A narrow waistline, wide hip and oily skin are the secondary signs of puberty in:

A
Males

B
Females

C
Both A and B

D
Not gender-based
Solution
Puberty is the process due to which growing boys or girls undergo the process of sexual maturation. Puberty involves a series of physical stages or steps that lead to the achievement of fertility and the development of secondary sex characteristics.
Some of the other secondary signs of puberty in girls are:
Breast tissue development
Initiation of menstrual periods
Increasing in sweat production
Development of body odour
Presence of pubic hair
So, the correct answer is "Females".
Question 4
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Consider the following statements and select the option which correctly identifies true (T) and false (F) ones.
(i) Ovary ripens to form seed and ovule ripens to form fruit after fertilization.
(ii) Seed dispersed through water usually develop floating ability in the form of spongy or fibrous outer coat as in coconut.
(iii) Pollination occurs before fertilization.
(iv) Cutting, layering, grafting and tissue culture are the natural methods of vegetative propagation .
(i) (ii) (iii) (iv)

A
F $$ \; $$ $$\; $$ F $$\; $$ $$\; $$ T $$\; $$ $$\; $$ F

B
F $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ F

C
T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ F

D
F $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T
Solution
- The ovary ripens to form fruit while the ovule ripens to form a seed after fertilization. Thus, the first statement is False.
- Seeds of the fruits get dispersed by different methods.
- The coconut plant produces the fruit with a fibrous coating that allows the fruit to float in the water. The seeds of the fruits in coconut are dispersed with the help of water. So, the second statement is True.
- Pollination is the transfer of pollen from stamen to the stigma of the same flower or different flower of the same species before fertilization. Hence, the third statement is True.
- Cutting, layering, grafting, and tissue culture are artificial methods of vegetative propagation. So, the fourth statement is False.
The correct option is B.
Question 5
1 / -0

The first sign of puberty in females is:

A
Breast development

B
Menstruation

C
High pitch of voice

D
Appearance of pubic hair
Solution
- Breast development is the secondary sexual characteristic in females which occurs during puberty due to the hormones like estrogen and progesterone.
- Secretion of these hormones starts at puberty and thus contributes to the appearance of secondary sexual characteristics at this age.
- So, the correct answer is option A.
Question 6
1 / -0

Regeneration occurs in which of the following organisms?

A
Planaria

B
Hydra

C
Saccharomyces

D
Both A and B
Solution
- If the individual is cut or broken up into many pieces accidentally, these pieces can regrow into separate individuals. This is called regeneration.
- Some species, like Hydra and Planaria, undergo regeneration.
- Budding occurs in Saccharomyces (yeast).
So, the correct option is C.
Question 7
1 / -0

Which one of the following methods requires two genetically variable individuals to produce the progeny?

A
Cutting

B
Layering

C
Budding

D
Goatee
Question 8
1 / -0

Which of the following methods of preventing pregnancy, act by changing hormonal balance of the body so that eggs are not released and fertilization cannot occur?

A
Creating a mechanical barrier

B
Taking oral pills

C
Sterilization method

D
Using Copper-T
Solution
- Oral contraceptives are commonly known as 'the pill', or 'birth control pill'.
- Most birth control pills contain a combination of the hormones estrogen and progestin, which is why they are also called 'combined pills' or 'combination pills'.
- The pill works mainly by changing the body's hormone balance so that the woman does not ovulate.
- It is more effective if taken correctly and consistently.
So the correct answer is option B.
Question 9
1 / -0

Name the process in which thousands of plants can be raised within a limited time and space.

A
Pathernocarpy

B
Self pollination

C
Tissue culture

D
Water
Solution
- The process by which thousands of plants can be raised within a limited time and space is Tissue culture.
- The process of growing new plants from a small piece of plant tissue or cells removed from the growing tips of a plant in a suitable growth medium, is called tissue culture.
- Its advantages are:
1) Thousands of plantlets can be produced in a very less time from a small amount of plant tissue.
2) Very little space is needed for developing new plants.
3) The plants produced are disease-free.
Question 10
1 / -0

Match the pairs of types of asexual reproduction.
Section-A Section-B
(1) Fission (i) Spirogyra
(2) Fragmentation (ii) Paramecium
(3) Regeneration (iii) Mucor
(4) Spore formation (iv) Planaria

A
1 - iv, 2 - iii, 3 - ii, 4 - i

B
1 - ii, 2 - i, 3 - iv, 4 - iii

C
1 - ii, 2 - iii, 3 - iv, 4 - i

D
1 - iii, 2 - iv, 3 - i, 4 - ii
Solution
1. Paramecium: It undergoes fission, a type of asexual reproduction. It duplicates all the contents of the cell and divides into two halves generating two daughter cells.
2. Spirogyra: It reproduces by the process of fragmentation. The organism splits into small fragments and each fragment produces a new Spirogyra.
3. Planaria: It can regenerate any lost part of its body. It undergoes asexual reproduction by regeneration.
4. Mucor: It reproduces by spore formation. It produces spores that can germinate and form an individual organism.

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Section-A	Section-B
(1) Fission	(i) Spirogyra
(2) Fragmentation	(ii) Paramecium
(3) Regeneration	(iii) Mucor
(4) Spore formation	(iv) Planaria

How do Organisms Reproduce Test - 33

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How do Organisms Reproduce Test - 33

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Question 1

Population A is more stable than population B.

Population B is more stable than population A.

Both population A and population B are stable.

Stability cannot be determined from the presence or absence of variations.

Solution

Question 2

$$50, 50$$

$$50, 100$$

$$50, 2500$$

$$2500, 2500$$

Question 3

Males

Females

Both A and B

Not gender-based

Solution

Question 4

F $$ \; $$ $$\; $$ F $$\; $$ $$\; $$ T $$\; $$ $$\; $$ F

F $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ F

T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ F

F $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T $$ \; $$ $$\; $$ T

Solution

Question 5

Breast development

Menstruation

High pitch of voice

Appearance of pubic hair

Solution

Question 6

Planaria

Hydra

Saccharomyces

Both A and B

Solution

Question 7

Cutting

Layering

Budding

Goatee

Question 8

Creating a mechanical barrier

Taking oral pills

Sterilization method

Using Copper-T

Solution

Question 9

Pathernocarpy

Self pollination

Tissue culture

Water

Solution

Question 10

1 - iv, 2 - iii, 3 - ii, 4 - i

1 - ii, 2 - i, 3 - iv, 4 - iii

1 - ii, 2 - iii, 3 - iv, 4 - i

1 - iii, 2 - iv, 3 - i, 4 - ii

Solution

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