Question

Class 9 Science MCQ Questions of Natural Resources with Answers?

Answer 1

Class 9 Science MCQ Questions of Natural Resources with Answers will help student revise all important concepts of class 9 and make them write correct answers for all objective type question within the exam. We have Provided MCQ Questions for class 9 Science with Answers to assist students understands the concept alright.

All the MCQ questions are given answers. Getting tuned in with these MCQ Questions of natural resources will assist you to practice Multiple choice questions of varying difficulty which is vital for the purpose of examination.

Practice MCQ Questions for class 9 Chapter-Wise

1. The atmosphere of the Earth is heated by radiations which are mainly

(a) radiated by the Sun
(b) re-radiated by land
(c) re-radiated by water
(d) re-radiated by land and water

2. What would happen, if all the oxygen present in the environment is converted to ozone?

(a) We will be protected more
(b) It will become poisonous and kill living forms
(c) Ozone is not stable, hence it will be toxic
(d) It will help harmful Sun radiations to reach Earth and damage many life forms.

3. One of the following processes is not a step involved in the water-cycle operating in nature

(a) evaporation
(b) transpiration
(c) precipitation
(d) photosynthesis

4. Which step is not involved in the carbon cycle?

(a) Photosynthesis
(b) Transpiration
(c) Respiration
(d) Burning of fossil fuels

5. Ozone-layer is getting depleted because of

(a) excessive use of automobiles
(b) excessive formation of industrial Units
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) excessive deforestation.

6. Top-soil contains the following

(а) Humus and living organisms only
(b) Humus and soil particles only
(c) Humus, living organisms, and plants
(d) Humus, living organisms, and soil particles

7. Biotic component of the biosphere is not constituted by

(a) producers
(b) consumers
(c) decomposer
(d) air

8. Light bands of muscle fibre are made of the protein:

(a) Tubulin
(b) Myosin
(c) Actin
(d) Myoglobin

9. Lichens do not like to grow in cities because of:-

(a) \(SO_2\) pollution
(b) Missing natural habitat
(c) Absence of right type of algae and fungi
(d) Lack of moisture

10. In nitrogen cycle, which bacteria are responsible for nitrification?

(a) Rhizobium
(b) Nitrosomonas
(c) Nitrosomonas and Nitrobacter
(d) Clostridium

11. Major protein of connective tissue is:

(a) Myosin
(b) Melanin
(c) Collagen
(d) Keratin

12. Breakdown of bigger rocks into fine smaller mineral particles is called:

(a) Paedogenesis
(b) Mineralization
(c) Cracking
(d) Weathering

13. Outer crust of earth is called ……………..

(a) Outer sphere
(b) Lithosphere
(c) Hydrosphere
(d) None of them

14. The protein deposited in the dead superficial cells that make the skin epithelium impervious to water is

(a) keratin
(b) elastin
(c) collagen
(d) mucus

15. Marked temperature changes in an aquatic environment can affect

(a) breeding of animals
(b) more growth of aquatic plants
(c) process of digestion in animals
(d) availability of nutrients.

16. Which is the universal solvent

(a) Ethanol
(b) Methanol
(c) Propanol
(d) Water

17. Disease-causing bacteria present in water cause…………….

(a) Cancer
(b) Aids
(c) Corona
(d) Cholera

18. Ozone layer forming hole above the……………..

(a) India
(b) America
(c) Antartica
(d) Pacific

19. Which of the following mainly decides biodiversity in a particular area?

(a) Depth of bottom soil
(b) Different layers of soil
(c) Chemical composition of middle soil
(d) Quality of topsoil

20. Bone marrow is important for

(a) breakdown of WBC
(b) production of RBC
(c) breakdown of RBC
(d) production of WBC

Answer 2

1. Answer: (d) re-radiated by land and water

Explanation: Earth absorbs radiation from the sun and then try to transmit it back to the atmosphere, but the atmosphere absorb very selective gas as a result of which the gas radiated gets back to earth resulting in an increase in temperature.

2. Answer:  (b) It will become poisonous and kill living forms

Explanation: Ozone is a poisonous gas and is thus only present in a thin layer in the stratosphere. lf all the oxygen is converted to ozone, the environment will become poisonous and kill all living forms

3. Answer:  (d) photosynthesis

Explanation: Photosynthesis is the process in plants where sunlight, carbon dioxide and water are converted to organic compounds, starch, energy, and oxygen. This is not involved in the water cycle.

4. Answer:  (b) Transpiration

Explanation: Transpiration however is primarily a process that is used for the gaseous exchange and release of water vapors into the atmosphere and thus not playing any direct role in the carbon cycle. 

5. Answer:  (c) excessive use of man-made compounds containing both fluorine and chlorine

Explanation: Fluorine and chlorine react with ozone and convert ozone gas into oxygen gas and a single fluorine or chlorine molecule can destroy thousands of ozone molecules. Hence, the Ozone layer is getting depleted because of excessive use of man-made compounds containing both chlorine and fluorine.

6. Answer: (d) Humus, living organisms and soil particles

Explanation: The topsoil layer is a mixture of sand, silt, clay, and broken down organic matter, called humus. Humus is a rich, highly decomposed organic matter mostly made from dead plants, crunched-up leaves, dead insects, and twigs. Topsoil is the home of living things and the materials that they make or they change.

7. Answer: (d) air

Explanation: Within an ecosystem, the biotic components include the living components such as producers, consumers, and decomposers i.e. the plants, animals, and microbes. This means that the biotic component of the biosphere is not constituted by non-living material like air.

8. Answer:  (c) Actin

Explanation: Light bands of muscle fibre are made of the protein called as Actin. Muscles are composed of bundles of single large cells (called muscle fibers) that form by cell fusion and contain multiple nuclei.

9.Answer:  (a) \(SO_2\) pollution

Explanation: Lichens have shown high sensitivity to sulfur dioxide (\(SO_2\)) concentrations. It is because \(SO_2\) reacts with moisture present in the atmosphere to form sulfurous acid.

10. Answer:  (c) Nitrosomonas and Nitrobacter

Explanation: The nitrification process requires the mediation of two distinct groups: bacteria that convert ammonia to nitrites (Nitrosomonas, Nitrosospira, Nitrosococcus, and Nitrosolobus) and bacteria that convert nitrites (toxic to plants) to nitrates (Nitrobacter, Nitrospina, and Nitrococcus).

11. Answer:  (c) Collagen

Explanation: Collagen is the major insoluble fibrous protein in the extracellular matrix and in connective tissue. In fact, it is the single most abundant protein in the animal kingdom.

12.Answer:  (d) Weathering

Explanation: The process of breaking bigger rocks into smaller fine particles is known as weathering.

13.Answer: (b) Lithosphere

Explanation: The lithosphere is the rocky outer part of the Earth. It is made up of the brittle crust and the top part of the upper mantle. The lithosphere is the coolest and most rigid part of the Earth.

14. Answer:  (a) keratin

Explanation: Keratin makes this epithelium impervious to water.

15. Answer:  (a) breeding of animals

Explanation: Marked temperature changes in an aquatic environment can affect more breeding and the growth of aquatic plants, as the aquatic organisms and plants were highly dependent on the temperature factor.

16. Answer:  (d) Water

Explanation: Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquid. This is important to every living thing on earth. This allows the water molecule to become attracted to many other different types of molecules.

17. Answer: (d) Cholera

Explanation: Contaminated water can be the source of large outbreaks of disease, including cholera, dysentery and cryptosporidiosis; for the majority of waterborne pathogens, however, there are other important sources of infection, such as person-to-person contact and food.

18. Answer: (c) Antartica  

Explanation: By summertime, stratospheric air from lower latitudes is able to penetrate the polar latitudes, and thereby replenish the ozone layer above Antarctica. Hence, there is a seasonal cycle to the ozone hole over Antarctica with the lowest ozone levels recorded in late September and early October.

19. Answer: (d) Quality of topsoil   

Explanation: The quality of the topsoil is an important factor that decides biodiversity in that area.

20. Answer: (b) production of RBC

Explanation: Bone marrow makes stem cells, which produce platelets and white and red blood cells. Here's why those cells are important to your child's health. A bone marrow transplant (BMT) restores healthy bone marrow in children with stem cell defects, cancer and certain inherited diseases. 

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