Practicing Class 8 Science MCQ and Class 8 Science Chapter 13 Our Home: Earth, A Unique Life Sustaining Planet MCQ Questions Online Test with Answers daily helps in time management.
Class 8 Our Home: Earth, A Unique Life Sustaining Planet MCQ with Answers
MCQ on Our Home: Earth, A Unique Life Sustaining Planet Class 8
Class 8 Science Chapter 13 Our Home: Earth, A Unique Life Sustaining Planet MCQ Questions with Answers
Question 1.
What is the ‘habitable zone’ also called?
(a) Blue zone
(b) Water zone
(c) Microbe zone
(d) Goldilocks zone
Answer:
(d) Goldilocks zone
Question 2.
Which layer of the atmosphere protects us from harmful UV rays?
(a) Carbon layer
(b) Troposphere
(c) Oxygen layer
(d) Ozone layer
Answer:
(d) Ozone layer
Question 3.
Which of the following acts like a protective shield for Earth?
(a) Earth’s magnetic field
(b) Carbon dioxide layer
(c) Earth’s crust
(d) Atmosphere only
Answer:
(a) Earth’s magnetic field
Question 4.
What are the male and female gametes in animals called?
(a) Seeds and spores
(b) Sperm and eggs
(c) Ovules and pollen
(d) Roots and shoots
Answer:
(b) Sperm and eggs
Question 5.
Which of the following statements is/are true for sexual reproduction in plants? (NCERT Exemplar)
(i) Plants are obtained from seeds.
(ii) Two plants are always essential.
(iii) Fertilisation can occur only after pollination.
(iv) Only insects are agents of pollination. Choose from the options given below.
(a) (i) and (iii)
(b) (i) only
(c) (ii) and (iii)
(d) (i) and (iv)
Answer:
(a) (i) and (iii)
Our Home: Earth, A Unique Life Sustaining Planet Class 8 Assertion-Reason Type Questions
Directions (Q. No. 1 to 4): The question below consists of an Assertion (A) and a Reason (R).
Use the following key to choose the appropriate answer.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A .
(c) A is true but R is false.
(d) A is false but R is true.
Question 1.
Assertion (A): The greenhouse effect helps maintain a suitable temperature on Earth.
Reason (R): Greenhouse gases absorb heat radiation from the Earth’s surface.
Answer:
(a) Both A and R are true and R is the correct explanation of A
Question 2.
Assertion (A): Earth is able to support life because it has the right size to hold an atmosphere.
Reason (R): A smaller planet would have weaker gravity and might not be able to hold gases.
Answer:
(a) Both A and R are true and R is the correct explanation of A
Question 3.
Assertion (A): Regeneration is the process of growing from a broken part.
Reason (R): Amoeba can regrow into a full organism from a small body part.
Answer:
(c) A is true but R is false
Question 4.
Assertion (A): Vegetative propagation is a type of sexual reproduction.
Reason (R): In vegetative propagation, plants reproduce from other parts of the plant instead of seeds.
Answer:
(d) A is false but R is true
Our Home: Earth, A Unique Life Sustaining Planet Class 8 Fill in the blanks
Question 1.
If Earth were the size of an apple, the ……….. would be as thin as the apple’s skin.
Answer:
crust
Question 2.
The process of Earth getting warmer due to trapped heat is called …………
Answer:
greenhouse effect
Question 3.
When sperm and egg combine, they form a ……….. .
Answer:
zygote
Question 4.
The solid parts of the Earth, including soil, rocks, and minerals, are called the ……….. -:
Answer:
geosphere
Question 5.
……….. is India’s first Mars orbiter launched by ISRO in 2013.
Answer:
Mangalyaan
Our Home: Earth, A Unique Life Sustaining Planet Class 8 True or False
Question 1.
Earth appears blue from space because most of its surface is covered with water.
Answer:
True
Question 2.
Soil is only made of dirt and has no nutrients.
Answer:
False
Question 3.
The disappearance of even one kind of plant or animal can affect the entire ecosystem.
Answer:
True
Question 4.
All reproduction involves two parents.
Answer:
False
Question 5.
Bacteria can become resistant to antibiotics.
Answer:
True
Our Home: Earth, A Unique Life Sustaining Planet Class 8 Match the following
Question 1.
| Column A | Column B |
| (i) Venus | (a) Chlorofluorocarbons |
| (ii) Solar wind | (b) Hottest planet |
| (iii) Methane | (c) Reproductive cells |
| (iv) Montreal Protocol | (d) Particles from the Sun |
| (v) Gametes | (e) Greenhouse gas |
Answer:
| Column A | Column B |
| (i) Venus | (b) Hottest planet |
| (ii) Solar wind | (d) Particles from the Sun |
| (iii) Methane | (e) Greenhouse gas |
| (iv) Montreal Protocol | (a) Chlorofluorocarbons |
| (v) Gametes | (c) Reproductive cells |