How do Organisms Reproduce Test

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How do Organisms Reproduce Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Menstrual cycle occurs in

A
Female primates

B
Human females

C
Mammalian females

D
Rabbit
Solution
The menstrual cycle refers to the hormonal and reproductive tissue changes that occur in adult female mammals during their reproductive years.
It is found primarily in humans and close relatives such as chimpanzees (female primates).
Primates any mammal of the group that are characterized by large brains, a short muzzle, poor sense of smell, prehensile five-digit hands and feet possessing flat nails instead of claws, and specialized behaviour.
So, the correct answer is 'Female primates'.
Question 2
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Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil.
(ii) They possess either stamen or pistil.
(iii) They exhibit cross pollination.
(iv) Unisexual flowers possessing only stamens cannot produce fruits.

A
(i) and (iv)

B
(ii), (iii) and (iv)

C
(iii) and (iv)

D
(i), (iii) and (iv)
Solution
- In flowering plants, the flowers can be unisexual with either stamen or pistil; or bisexual having both stamen and pistil in the same flower.
- In both types of flowers, the pistil bears ovary, which on maturation forms the fruit.
- So, unisexual flowers with only stamens cannot produce fruits. Also, the unisexual flowers pollinate through cross-pollination.
Therefore, the correct answer is option B.
Question 3
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In the list given below, those that reproduce by the asexual methods are:
(i) Banana
(ii) Dog
(iii) Yeast
(iv) Amoeba

A
(ii) and (iv)

B
(i), (iii) and (iv)

C
(i) and (iv)

D
(ii), (iii) and (iv)
Question 4
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Bread mould mostly grows on a moist slice of bread kept in the open rather than on a dry slice of bread kept in the refrigerator. Why?

A
Moisture is an important factor for growth of mould.

B
Warmth is an important factor for growth of mould.

C
The softness of bread is an important factor for the growth of mould as mould can not tolerate tough surfaces.

D
Both A and B

Solution

Moulds require moisture for growth. They reproduce exponentially in humid areas. Hence, the mould mostly grows on bread which is moist rather than dry. Warmth is also an important growth factor for fungi. A moist bread kept in the open at room temperature would show the growth of mould after few days, but dry bread kept in the refrigerator would not. This is because of the unavailability of moisture and warmth.
Thus, the correct answer is option D.
Question 5
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Colonies of yeast fail to multiply in water, but multiply in sugar solution. Choose one reason for this.

A
Sugar provides energy for sustaining all life activities in yeasts.

B
Water provides energy for sustaining all life activities in yeasts.

C
Sugar provides surface for sustaining all life activities in yeasts.

D
All of the above.

Solution

Yeasts are eukaryotic microorganisms, classified in the kingdom Fungi. Yeasts are chemoorganotrophs and they use organic compounds as a source of energy. Carbon is obtained through various sugars. Yeasts can metabolize sugars as they ferment sugar resulting in the formation of ethanol. So, sugar provides energy to yeasts, which helps to carry out various life processes.
So, the correct answer is 'Sugar provides energy for sustaining all life activities in yeasts'.
Question 6
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Which of the following statements is true about fertilization?

A
Egg released from the ovary reaches the fallopian tube.

B
Sperm encounters egg in the fallopian tube and fertilization takes place.

C
Sperm enters through the vaginal passage.

D
All the above

Solution

Fertilization is the process of fusion of egg and sperm. The egg is released from the ovary and reaches the fallopian tube. The sperm enters through the vagina and encounters the egg in the fallopian tube. The sperm fuses with the egg and fertilization take place in the fallopian tube. Thus, the correct answer is option D.
Question 7
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Which of the following statements about reproduction in human beings is correct?

A
Fertilization takes place in ovary.

B
Fertilization takes place in the testes.

C
During fertilization egg moves towards the sperm.

D
Fertilization takes place in the fallopian tube.

Solution

Fertilization that takes place inside the body is called internal fertilization. In humans, fertilization takes place in females, in the oviduct or the fallopian tube. For fertilization, the motile sperm moves towards the egg and fuses to form the zygote. Thus, the correct answer is option D.
Question 8
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Which among the following is a correct statement with respect to reproduction and population?

A
Reproduction is linked to instability of a species.

B
Reproduction is linked to instability of a population.

C
Reproduction is linked to stability of the population of a species.

D
Reproduction is linked to instability of a community.
Solution
- The consistency of DNA copying during reproduction is important for the maintenance of body design features that allow the organism to use that particular niche.
- Every organism faces a lot of competition for survival. Barring a very few, most of the organisms end up being food for some other organism.
- Competition and predation result in a drastic reduction in the population size of a species. But reproduction ensures that the population of a species is maintained at an optimum level.
- Reproduction is therefore linked to the stability of populations of species.
Therefore, option C is correct.
Question 9
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During adolescence, several changes occur in the human body. Find out the change which is associated with sexual maturation in boys.

A
Loss of milk teeth

B
Increase in height

C
Cracking of voice

D
Weight gain

Solution

At puberty, the voice box or the larynx begins to grow. Boys develop larger voice boxes. The growing voice box in boys can be seen as a protruding part of the throat called Adam's apple.
Other changes are not associated specifically with puberty, e.g. an increase in height and weight can occur before puberty also and similarly loss of milk teeth is also not associated with puberty.
Therefore, the correct answer is option C.
Question 10
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In human females, an event that reflects the onset of reproductive phase is:

A
Growth of body

B
Changes in hair pattern

C
Change in voice

D
Menstruation

Solution

Growth and changes in voice or hair pattern are associated with the physical changes that occur during adolescence. However, the onset of menstruation is associated with sexual maturity in girls.
Menstruation is normal vaginal bleeding that occurs as part of a woman's monthly cycle. Every month, the female body prepares for pregnancy. If no pregnancy occurs, the uterus, or womb, sheds its lining. The menstrual blood is partly blood and partly tissue from inside the uterus.
So, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

How do Organisms Reproduce Test - 17

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How do Organisms Reproduce Test - 17

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SHARING IS CARING

Question 1

Female primates

Human females

Mammalian females

Rabbit

Solution

Question 2

(i) and (iv)

(ii), (iii) and (iv)

(iii) and (iv)

(i), (iii) and (iv)

Solution

Question 3

(ii) and (iv)

(i), (iii) and (iv)

(i) and (iv)

(ii), (iii) and (iv)

Question 4

Moisture is an important factor for growth of mould.

Warmth is an important factor for growth of mould.

The softness of bread is an important factor for the growth of mould as mould can not tolerate tough surfaces.

Both A and B

Solution

Question 5

Sugar provides energy for sustaining all life activities in yeasts.

Water provides energy for sustaining all life activities in yeasts.

Sugar provides surface for sustaining all life activities in yeasts.

All of the above.

Solution

Question 6

Egg released from the ovary reaches the fallopian tube.

Sperm encounters egg in the fallopian tube and fertilization takes place.

Sperm enters through the vaginal passage.

All the above

Solution

Question 7

Fertilization takes place in ovary.

Fertilization takes place in the testes.

During fertilization egg moves towards the sperm.

Fertilization takes place in the fallopian tube.

Solution

Question 8

Reproduction is linked to instability of a species.

Reproduction is linked to instability of a population.

Reproduction is linked to stability of the population of a species.

Reproduction is linked to instability of a community.

Solution

Question 9

Loss of milk teeth

Increase in height

Cracking of voice

Weight gain

Solution

Question 10

Growth of body

Changes in hair pattern

Change in voice

Menstruation

Solution

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