How do Organisms Reproduce Test

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How do Organisms Reproduce Test - 22

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Question 1
1 / -0

The features which help to distinguish the male from the female are called:

A
Sex chromosomes

B
Primary sexual characters

C
Secondary sexual characters

D
All of the above

Solution

Secondary sexual characters are the features that are seen during puberty in humans and sexual maturity in other animals, As puberty progresses, and sex hormone levels rise, differences appear, though puberty causes some similar changes in male and female bodies and these differences lead to secondary sexual characteristics.
Thus, the correct answer is option C.
Question 2
1 / -0

Flowers which have both stamens and pistils are called:

A
Incomplete flowers

B
Bisexual flowers

C
Unisexual flowers

D
Co-existent flowers
Solution
- A flower that lacks one or two of the 4 parts is called an incomplete flower.
- A bisexual flower has both stamen and pistil in the same flower.
- A unisexual flower has one of the reproductive organs, i.e. either stamen or pistil.
So the correct option is option B.
Question 3
1 / -0

The function of a corolla in a flower is:

A
To produce male gametes

B
To produce female gametes

C
To hold pollen grains

D
To attract insects

Solution

Corolla is formed of petals and is a colorful part of the plant that has fragrance or provides nectar. It is brightly colored in the plants that depend on insects for pollination. Its shape and color vary greatly in plants.
So the correct option is "To attract insects".
Question 4
1 / -0

Name the reproductive organ of plants.

A
Flower

B
Leaves

C
Stem

D
Roots
Question 5
1 / -0

Which of the following part manufactures food and supply it to other floral parts?

A
Sepals

B
Petals

C
Anther

D
Stigma

Solution

Sepals form the outermost whorl of a flower. They are mostly green in colour due to the presence of chlorophyll and hence can perform photosynthesis and may supply food to other floral parts.
So, the correct answer is A - 'Sepals'.
Question 6
1 / -0

What is menstruation?

A
Its a women disease recurring every month.

B
Its a normal reproductive process in mature females.

C
When fertilization does not occur, the released egg and the thickened lining of the uterus along with its blood vessels are shed off.

D
Both B and C.
Solution
Solution

Correct answer is option D.

Explanation for correct option:
- Menstruation is cyclic discharge of unfertilised egg, debris, tissues from uterus along with blood.
- If egg is fertilized, it travels to the uterus over the following 6–12 days, to possibly implant for pregnancy.
- If there is no fertilization- levels of oestrogen and progesterone drops – resulting in breaking down of uterine lining i.e., menstruation. And level of LH, FSH rises to start new cycle.
Question 7
1 / -0

Contraceptive oral pills help in birth control by

A
Preventing ovulation

B
Killing the ova

C
Killing the sperms

D
Forming barriers between sperms and ova

Solution

Fertilization of the ovum and its subsequent implantation is referred to as conception or pregnancy. Prevention of conception is called contraception. Oral contraceptives (birth control pills) can be taken to change the hormonal balance of the body so that the ovum is not released from the ovary. The pills may contain combinations of the hormones estrogen and progestin or progestin alone. Combinations of estrogen and progestin prevent pregnancy by inhibiting the release of the hormones luteinizing hormone (LH) and follicle stimulating hormone (FSH) from the pituitary gland. LH and FSH play key roles in the development of the egg and preparation of the lining of the uterus for implantation of the embryo. Progestin also makes the uterine mucus that surrounds the egg more difficult for sperm to penetrate. Since the ovum does not come into the Fallopian tube, it is not fertilized.
Thus, the correct answer is option A.
Question 8
1 / -0

What is formed immediately after fertilization?

A
Placenta

B
Foetus

C
Embryo

D
Zygote

Solution

Zygote is the fertilized egg, that results from the union of a female gamete (egg) with a male gamete (sperm) by a process called fertilization.
Placenta is an organ that connects the developing foetus to the uterine wall.
Foetus is the stage between the embryonic stage and birth.
The embryo stage is about five weeks old (or from 7th week of pregnancy).
Thus, the correct answer is option D.
Question 9
1 / -0

If fertilization doesn't occur, the egg is released out through ___________.

A
Urine

B
Menstrual cycle

C
Sweat

D
Both A and B

Solution

The mature egg is released from the ovary and pushed down the fallopian tube for it to fertilize. If no fertilization takes place, the egg degenerates and is shed from the body along with the uterine lining as well as the blood, which happens during menstruation.
Thus, the correct answer is option B.
Question 10
1 / -0

Seeds are called products of sexual reproduction because they_________ .

A
Give rise to new plants

B
Are formed by fusion of gametes

C
Are formed by fusion of pollen tubes

D
Can survive for longer periods
Solution
Seeds are called products of sexual reproduction because they are formed only after the fusion of male and female gametes. This process is called fertilization, where one of the male gametes that have entered the ovule through an opening called micropyle, fertilizes the egg cell (female gamete).
The resulting zygote forms the embryo, which develops within the ovule which becomes a seed.
So, the correct answer is 'Are formed by fusion of gametes'.

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How do Organisms Reproduce Test - 22

Result

How do Organisms Reproduce Test - 22

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SHARING IS CARING

Question 1

Sex chromosomes

Primary sexual characters

Secondary sexual characters

All of the above

Solution

Question 2

Incomplete flowers

Bisexual flowers

Unisexual flowers

Co-existent flowers

Solution

Question 3

To produce male gametes

To produce female gametes

To hold pollen grains

To attract insects

Solution

Question 4

Flower

Leaves

Stem

Roots

Question 5

Sepals

Petals

Anther

Stigma

Solution

Question 6

Its a women disease recurring every month.

Its a normal reproductive process in mature females.

When fertilization does not occur, the released egg and the thickened lining of the uterus along with its blood vessels are shed off.

Both B and C.

Solution

Question 7

Preventing ovulation

Killing the ova

Killing the sperms

Forming barriers between sperms and ova

Solution

Question 8

Placenta

Foetus

Embryo

Zygote

Solution

Question 9

Urine

Menstrual cycle

Sweat

Both A and B

Solution

Question 10

Give rise to new plants

Are formed by fusion of gametes

Are formed by fusion of pollen tubes

Can survive for longer periods

Solution

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