Available Answers

1. 1.

   Fill in the blanks.

   1. Air and water are part of the _____________ component of an ecosystem.
   2. Living beings constitute the _____________ component of an ecosystem.
   3. Plants are called _____________ because they manufacture food.
   4. Organisms which live on dead organic matter are called _____________.
   5. The _____________ the source of energy for the living world.
   6. Herbivores are the _____________ consumers of an ecosystem.
   7. Each step of a food chain is called a _____________ level.
   8. The highest trophic level is occupied by the apex _____________.
   9. A _____________ is a network formed by several connected food chains.
   10. Mutualism is a relationship between two organisms in which both organisms are _____________.
   S A M P L E

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   Answer:

   S A M P L E

   1. abiotic
   2. biotic
   3. producers
   4. decomposers
   5. Sun
   6. primary consumers
   7. Tropic
   8. pre...
   9. ...
   10. ...
2. 2.

   Choose the correct option.

   1. The gas that protects us from ultraviolet radiation is

   1. nitrogen
   2. carbon dioxide
   3. sulphur dioxide
   4. ozone

   2. The parts of the atmosphere, lithosphere and hydrosphere where life exists together form the

   1. ecosystem
   2. environment
   3. biosphere
   4. habitat

   3. Which is a secondary consumer

   1. Grasshopper
   2. Snake
   3. Eagle
   4. Frog

   4. An eagle that eats snakes is

   1. a primary consumer
   2. a secondary consumer
   3. an apex predator
   4. a producer

   5. Blue-green algae are

   1. producers
   2. primary consumers
   3. secondary consumers
   4. apex predators

   6. A lion and a deer are ecologically related through

   1. parasitism
   2. symbiosis
   3. predation
   4. none of these

   7. Which is the topmost layer in a forest ecosystem?

   1. Forest floor
   2. Understory
   3. Canopy
   4. All of these

   8. Which tree is found in a tropical rainforest?

   1. Pine
   2. Ebony
   3. Indian plum
   4. Maple

   9. Redwood trees are found in a

   1. tropical rainforest
   2. tropical deciduous forest
   3. temperate evergreen forest
   4. temperate deciduous forest

   10. Which animal is found in a boreal forest?

   1.  Jaguar
   2. Elephant
   3. Python
   4. Caribou
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   Answer:

   S A M P L E

   1. (d) ozone
   2. (c) biosphere
   3. (d) frog
   4. (c) an apex predator
   5. (a) produc
   6. (c) predat...
   7. ...
   8. ...
   9. ...
   10. ...
3. 3.

   Match the following.
    

   Column A	Column B
   Producers  Clownfish and sea anemone  Tapeworms and human beings Monsoon forest  Epiphytes  Apex predator Taiga	Tropical deciduous forest Rainforest Green plants Mutualism Parasitism  Boreal forest Lion

   S A M P L E

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   Answer:

   S A M P L E

   1. (c) green plants
   2. (d) mutualism
   3. (e) parasitism
   4. (a) tropical deci
   5. (...
   6. ...
   7. ...
4. 4.

   What is an ecosystem? Name two types of aquatic and terrestrial ecosystems.
5. 5.

   What is the difference between biome and biosphere?
6. 6.

   Name the two main components of an ecosystem. What makes up the biotic component?