CBSE Solutions for Class 10 Physics

Select CBSE Solutions for class 10 Subject & Chapters Wise :

How should we dispose waste?

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Answer :

By segregating biodegradable and non-biodegradable material.

Why should biodegradable and non- biodegradable wastes be discarded in two separate dustbins? [AI 2017(C); Delhi 2013, 15]

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Answer :

The biodegradable and non-biodegradable wastes must be discarded in two different dustbins because biodegradable Wastes gets decomposed by the microorganisms whereas non-biodegradable wastes can be recycled and reused.

Select two non-biodegradable substances from the following wastes generated in a kitchen: spoilt food, paper bags, milk bags, vegetable peels, tin cans, used tea leaves. [Delhi 2012]
 

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Answer :

Milk bags and tin cans.

We often use the word environment. What does it mean? [Foreign 2016]
 

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Answer :

It is the sum total of all external conditions and influences that affect the life and development of an organism, i.e. the environment includes all the physical or abiotic and biological or biotic factors.

The disposal of wastes by putting it in low-lying areas of ground and covering it with earth is called landfill. [True/False]

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Answer :

True

Disposal of waste means recycling of wastes. [True/False]

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Answer :

False

Food chains generally consist of three or four organisms. [True/False]

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Answer :

True

Factors such as light, temperature, pressure and humidity are considered as biotic components. [True/False]

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Answer :

False

Ozone layer presents harmful infrared radiation. [True/False]

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Answer :

False

Decomposers get their energy directly from autotrophs. [True/False]

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Answer :

False

Forests, ponds and lakes are examples of ……………. type of ecosystems.

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Answer :

natural

Ozone shields the surface of the Earth from ……………. radiation the sun.

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Answer :

ultraviolet (UV)

The increase in concentration of harmful chemicals at successive trophic levels is called …………….

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Answer :

biomagnifications

There is always a ……………. flow of energy in a food chain.

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Answer :

unidirectional

A network of food chains is called a …………….

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Answer :

food web

All consumers are directly or indirectly dependent on ……………. for their energy requirements.

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Answer :

producers

Growth, reproduction etc. of living organisms are affected by the ……………. components of ecosystem.

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Answer :

abiotic

The amount of energy transferred from a trophic level to the next trophic level is only …………….

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Answer :

10%

Gardens and crop-fields are ……………. type of ecosystems.

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Answer :

artificial

Biodegradable materials persist in the environment as they have a ……………. nature.

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Answer :

Inert

What is the role of decomposers in the ecosystem?

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Answer :

Following is the role of a decomposer in the ecosystem:

  • They act as a cleansing agent of the environment by decomposing the dead plants and animals
  • They help in recycling the nutrients
  • They provide space for new beings in the biosphere by decomposing the dead

They help in putting back the various elements into water, soil and air for the reuse of producers like crop plants.

What are the tropic levels? Give an example of a food chain and state the different tropic levels in it.

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Answer :

In the food chain, the transfer of food or energy takes place at various levels and these levels are known as tropic levels.

Example:

Grass → Goat → Man

In the food chain,

  • Grass represents the first tropic level
  • The goat represents the second tropic level

Man represents the third tropic level

  1. These are the chemicals used to kill the pests

Lion
 

  1. A top carnivore

Ozone

 

  1. A primary consumer

Decompose
 

  1. Bacteria do this to the biodegradable waste

Patricide

  1. Protects us from UV rays

Goat

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Answer :

a. Patricide
b. Lion
c. Goat
d. Decompose
e. Ozone

Match the following columns

Column I

Column II

(i) Parasites

(a) Abiotic

(ii) Crop field

(b) bio-degradable

(iii) Synthetic foam

(c) Biotic

(iv) pH

(d) Artificial ecosystem

(v) Forests

(e) Decomposers

(iv) DDT

(f) Scavengers

(vii) Wood

(g) Natural ecosystem

(viii) Fungi

(h) Biomagnification

(ix) Vulture

(i) Non-biodegradable

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Answer :

Column I

Column II

(i) Parasites

(c) Biotic

(ii) Crop field

(d) Artificial ecosystem

(iii) Synthetic foam

(a) Abiotic

(iv) pH

(h) Biomagnification

(v) Forests

(g) Natural ecosystem

(iv) DDT

(i) Non-biodegradable

(vii) Wood

(b) bio-degradable

(viii) Fungi

(e) Decomposers

(ix) Vulture

(f) Scavengers

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Browse & Download CBSE Books For Class 10 - All Subjects

The GSEB Books for class 10 are designed as per the syllabus followed Gujarat Secondary and Higher Secondary Education Board provides key detailed, and a through solutions to all the questions relating to the GSEB textbooks.

The purpose is to provide help to the students with their homework, preparing for the examinations and personal learning. These books are very helpful for the preparation of examination.

For more details about the GSEB books for Class 10, you can access the PDF which is as in the above given links for the same.

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