How do Organisms Reproduce Test

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How do Organisms Reproduce Test - 21

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Question 1
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Which among the following is the mode of reproduction in unicellular organisms?

A
Budding

B
Fragmentation

C
Multiple fission

D
All of the above
Solution
Unicellular organisms generally divide by the means of asexual reproduction. Asexual reproduction is a mode of reproduction by which offspring arise from a single organism, and inherit the genes of that parent only. There are various asexual reproduction methods by which the unicellular organisms divide.
- Budding is a type of asexual reproduction by which offspring arise from a single organism.
- Fragmentation is the form of asexual reproduction in which an organism is split into mature, fully grown individuals that are clones of the original organism.
- Multiple fission is that type of asexual reproduction in which the parental body divides into many daughter cells simultaneously during unfavourable conditions.
- So, the correct answer is option D.
Question 2
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Which part of the flower forms the fruit?

A
Whole flower

B
Only stamens and carpel

C
Only ovary

D
Only carpel

Solution

After the process of fertilization, the ovary swells up and develops into a fruit.
Thus, the correct answer is option (C), 'Only ovary'.
Question 3
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The contraceptive/s among the following is/are:

A
Condom, cervical cap and diaphragm

B
Intrauterine device

C
Pill

D
All of the above
Solution
- Contraception is the method to prevent unwanted pregnancy.
- Different methods of contraception include caps, combined pill, condoms (female), condoms (male), contraceptive implant, contraceptive injection, contraceptive patch, diaphragms, intrauterine devices (IUDs), natural family planning, progestogen-only pill, vaginal ring.
Thus, the correct answer is option D.
Question 4
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Accessory sexual characters first appear in:

A
Childhood

B
Puberty

C
Foetus

D
Adulthood

Solution

Puberty is a process of sexual maturity which is regulated by several hormones which bring a remarkable change in the human body.
In males, puberty begins between ages 10 and 12 and continues until ages 16 to 18. Testosterone directly affects muscle and bone and stimulates the adolescent growth spurt in males at puberty.
In females, oestrogens are responsible for the growth of the sex organs at puberty, for body growth and for the development of secondary sexual characteristics.
So, the correct answer is option B.
Question 5
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Regeneration is the process of:

A
Renewal

B
Restoration and growth

C
Death

D
Both A and B

Solution

Regeneration is the ability to replace lost or damaged body parts. For example, plants can regenerate all body parts from the precursor cells. Many trees, for example, can be cut off at the ground and in due course, sprouts appear. These go on to develop the new stem, leaves and flowers. So, regeneration is a process of restoration and growth and also a process of renewal.
So, the correct answer is option D.
Question 6
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Which among the following is/are the method/s of contraception?

A
Barrier methods

B
Chemical methods

C
Intrauterine Devices

D
All of the above
Solution
There are four different methods of contraception:
- Barrier methods include the use of condoms, diaphragm, cervical caps, spermicides, sponges, etc, where sperms are protected by mechanical means to prevent entering the uterus.
- Hormonal methods or Chemical methods use hormones to regulate or stop ovulation and prevent pregnancy. These include various pills like combined oral contraceptives, progestin-only pill, injectable birth control, etc.
- An intrauterine device (IUD) is a small, T-shaped device that is inserted into the uterus to prevent pregnancy.
- Surgical methods include vasectomy (in males) where vasa deferentia are cut and tied while in tubal ligation (in females) the fallopian tubes are cut and tied so that the respective gametes are not transferred to the site of fertilisation.
Question 7
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Which of the following organisms can reproduce through regeneration?

A
Hydra

B
Planaria

C
Wall lizard

D
Both A and B
Solution
- Hydra is a freshwater polyp that has a remarkable property to regenerate. It has the ability to re-grow the body parts which have been damaged and similar is the case with Planaria.
- Both Hydra and Planaria use regeneration as a mode of producing new organisms.
- Though lizards have the ability to regenerate lost parts of the body they lack the ability to reproduce through regeneration.
Thus, the correct answer is option D.
Question 8
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Which of the following methods involves the formation of new plants from roots, stems, and leaves?

A
Sexual reproduction

B
Vegetative reproduction

C
Layering

D
Grafting

Solution

Vegetative reproduction is a form of asexual reproduction of a plant. It involves the formation of new plants from roots (E.g., Sweet potato, tapioca, yam, dahlia etc.), stems (E.g., Onions, Lillies, garlic etc.), and leaves (E.g., Bryophyllum). Only one parent plant is involved and the new individual is identical to the parent.
So, the correct answer is option B.
Question 9
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When you study a slide showing different stages of budding in yeast, you observe the following stages:
I. The bud gets separated from the parent body and develops into a new individual.
II. The bud remains attached to the parent body and develops.
III. A bud comes out in any direction from the body of the parent cell.
IV. New individual grows independently.
The proper sequence of the above stages is:

A
II, I, III, IV

B
II, III, I, IV

C
III, II, I, IV

D
III, I, II, IV

E
II, III, IV, I

Solution

Budding is a type of asexual reproduction in which a new organism is formed from a bud of an existing organism. In yeast, the cells divide rapidly at a specific site and develop as an outgrowth called a bud. The bud, while attached to the parent plant, develops into a small individual. When this individual becomes large enough, it detaches itself from the parent body to exist as an independent individual.
So, the correct option is C.
Question 10
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Vegetative reproduction is defined as:

A
Fertilization of stamens and stigma through pollen grains.

B
Development of new plant from spores when favourable conditions are provided.

C
Reproduction of new plants from a part of a plant other than the reproductive organs.

D
Regeneration of a plant from a piece of plant.

Solution

Vegetative reproduction is the development of plantlets from vegetative structures of the plant like leaf, root, stem etc. It does not develop from the gametes.
So, the correct answer is 'Reproduction of new plants from a part of a plant other than the reproductive organs'

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How do Organisms Reproduce Test - 21

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How do Organisms Reproduce Test - 21

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SHARING IS CARING

Question 1

Budding

Fragmentation

Multiple fission

All of the above

Solution

Question 2

Whole flower

Only stamens and carpel

Only ovary

Only carpel

Solution

Question 3

Condom, cervical cap and diaphragm

Intrauterine device

Pill

All of the above

Solution

Question 4

Childhood

Puberty

Foetus

Adulthood

Solution

Question 5

Renewal

Restoration and growth

Death

Both A and B

Solution

Question 6

Barrier methods

Chemical methods

Intrauterine Devices

All of the above

Solution

Question 7

Hydra

Planaria

Wall lizard

Both A and B

Solution

Question 8

Sexual reproduction

Vegetative reproduction

Layering

Grafting

Solution

Question 9

II, I, III, IV

II, III, I, IV

III, II, I, IV

III, I, II, IV

II, III, IV, I

Solution

Question 10

Fertilization of stamens and stigma through pollen grains.

Development of new plant from spores when favourable conditions are provided.

Reproduction of new plants from a part of a plant other than the reproductive organs.

Regeneration of a plant from a piece of plant.

Solution

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