Science exemplar problems class 10 Solutions for Chapter 13 our environment

Exercises in Chapter 13 our environment Grade 10

Our Environment - Exercise

Questions in Our Environment - Exercise

An ecosystem includes

In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level?

Grass → Grasshopper → Frog → Snake → Hawk

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

Flow of energy in an ecosystem is always

Excessive exposure of humans to U V-rays results in

(i) damage to immune system

(ii) damage to lungs

(iii) skin cancer

(iv) peptic ulcers

Which group of organisms are not constituents of a food chain?

(i) Grass, lion, rabbit, wolf

(ii) Plankton, man, fish, grasshopper

(iii) Wolf, grass, snake, tiger

(iv) Frog, snake, eagle, grass, grasshopper

In the following groups of materials, which group (s) contains only non-biodegradable items?

(i) Wood, paper, leather

(ii) Polythene, detergent, PVC

(iii) Plastic, detergent, grass

(iv) Plastic, bakelite, DDT

Which of the following limits the number of trophic levels in a food chain?

Which of the statement is incorrect?

The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about

The decomposers in an ecosystem

In the given Figure 15.1 the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?

What will happen if deer is missing in the food chain given below?

Grass → Deer → Tiger

If a grass hopper is eaten by a frog, then the energy transfer will be from

Disposable plastic plates should not be used because

Which one of the following is an artificial ecosystem?

What is the name of the process by which a compound such as a pollutant or a pesticide increases its concentration in the tissues of successive organisms as it moves up in the food chain?

Depletion of ozone is mainly due to

Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called

In a food chain, the third trophic level is always occupied by

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Chapters in this book

Chemical Reactions and Equations

Acids, Bases and Salts

Metals and Non-metals

Carbon and Its Compounds

Life Processes

Control and Coordination

How do Organisms Reproduce?

Heredity and Evolution

Light Reflection and Refraction

Human Eye and Colourful World

Electricity

Magnetic Effects of Electric Current

Our Environment

Management of Natural Resources