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Lakhmir Singh solutions Biology for Class 10 (2019 Exam) chapter 5 Our Environment

Chapters

Lakhmir Singh Solutions for Physics for Class 10 (2019 Exam)

Lakhmir Singh Biology Class 10 (2019 Exam)

Biology for Class 10 (2019 Exam)

Chapter 5 - Our Environment

Pages 226 - 227

What is the functional unit of the environment comprising of the living and non-living components called?

Q 1 | Page 226

Name two natural ecosystems and two artificial ecosystems.

Q 2 | Page 226

Which one of the following is not a terrestial ecosystem?
forest, Grassland, Aquarium, Desert

Q 3 | Page 226

Why are plants called producers?

Q 4 | Page 226

What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?

Q 5 | Page 226

What are planktons?

Q 6 | Page 226

State whether the following statements are true or false :
 In biology, human beings are called producers.

Q 7.1 | Page 226

State whether the following statements are true or false :

Secondary consumers and tertiary consumers, both are carnivores.

Q 7.2 | Page 226

Which category of organisms forms the starting point of a food chain?

Q 8 | Page 226

Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat

 
Q 9 | Page 226

Which of the following belong to the same trophic level?
Tree ; Frog ; Snake ; Grass ; Lizard

 
Q 10 | Page 226

Write an aquatic food chain.

 
Q 11 | Page 226

Name the organisms belonging to the second and the fourth trophic levels in the food chain comprising the following :
Frogs, Plants, Snakes, Hawk, Insects

Q 12 | Page 226

What are the various steps of food chain called?

Q 13 | Page 226

Construct a food chain comprising the following :
Snakes, Hawk, Rats, Plants

Q 14 | Page 226

Which organisms belong to third and fourth trophic levels in the food chain comprising the following?
Rats, Plants, Hawk, Snakes

Q 16 | Page 226

Which one term in the following includes the others?
air, flora, fauna, environment, water, sunlight, soil

Q 17 | Page 226

A food chain represents a unidirectional flow of X. What is X?

Q 18 | Page 226

Fill in the following blanks with suitable words :
(a) Decomposer organisms are..........in their action.

Q 19.1 | Page 226

Fill in the following blanks with suitable words :

 In nature, all green plants are............ whereas animals are consumers.

Q 19.2 | Page 226

Fill in the following blanks with suitable words :

 A series of organisms, each of which feeds on the next organism, the beginning of which is a green plant, is called a .............

Q 19.3 | Page 226

Fill in the following blanks with suitable words :

The science that deals with the inter-relationships of living things with one another and their environment is called...........

Q 19.4 | Page 226

Fill in the following blanks with suitable words :

 Plastic is a ...............material whereas paper is a.............material.

Q 19.5 | Page 226

Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.

Q 20 | Page 226

Name one decomposer.

Q 21.1 | Page 226

Define decomposers. 

Q 21.1 | Page 226

What is the role of decomposers in the ecosystem?

Q 21.2 | Page 226

What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.

Q 22 | Page 226

Give an example of a four step food chain operating in grassland. Name the secondary consumer in this food chain

Q 23 | Page 227

Draw the food chain with four trophic levels.

Q 24.1 | Page 227

Define trophic level.

Q 24.1 | Page 227

What will happen if we kill all the organisms in one trophic level?

Q 24.2 | Page 227

What is the difference between the food habits of organisms belonging to the first and the third trophic levels? Give one example each of the organisms belonging to these two trophic levels.

Q 25 | Page 227

Can the organisms of any trophic level be removed without causing any damage to the ecosystem? Will the impact of removing all the organisms in a trophic level be different for different trophic levels?

Q 26 | Page 227

Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?

Q 27 | Page 227

The number of malaria patients in a village increased tremendously when large number of frogs were exported from the village. What could be the cause for it?

Q 28 | Page 227

How does a biodegradable waste differ from a non-biodegradable waste? Give two examples of non-biodegradable wastes which pollute our environment.

Q 29 | Page 227

Which of the following are biodegradable and which non-biodegradable?
Glass bottle, Paper, Ball point pen refill, Hay, DDT, Wheat, Cake, Wood, Polythene bag, Jute bag, Cotton cloth, Grass, Vegetable peels

Q 30 | Page 226

Lakhmir Singh Biology Class 10 (2019 Exam)

Biology for Class 10 (2019 Exam)
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