Available Answers

1. 1.

   Decomposers are also called nature's scavengers. Why?

2. 2.

   Fill in the blanks.

   1. Green plants are called producers or _______________.
   2. Human beings and cockroaches are _______________.
   3. __________________ are also called nature's scavengers.
3. 3.

   Tick the most appropriate answer.

   1. The study of the interaction between living organisms and their environment is called
      1. physiology
      2. zoology
      3. environment
      4. ecology
   2. Which of the following are producers?
      1. carnivores
      2. herbivores
      3. green plants
      4. omnivores
   3. They break down the complex organic compounds present in the remains of dead plants and animals into simpler substances.
      1. producers
      2. primary consumers
      3. decomposers
      4. herbivores
   4. A series of organisms that are linked to each other through a precess of eating and being eaten form a
      1. food net
      2. food chain
      3. food web
      4. none of these
   5. The plants or the producers which fix the solar energy constitute the
      1. second trophic level
      2. third trophic level
      3. fourth trophic level
      4. first trophic level
   6. Animals depend on plants for
      1. food alone
      2. shelter alone
      3. carbon dioxide
      4. food and oxygen
   7. Animals that are active at night are called
      1. diurnal animals
      2. nocturnal animals
      3. aquatic animals
      4. terrestrial animals
   8. Which of the these is not a terrestrial ecosystem?
      1. pond
      2. grassland
      3. desert
      4. mountain
4. 4.

   Fill in the blanks.

   1. The term ecology was first used by a German scientist named ________________.
   2. Plants, animals and microorganism constitute the _______________ components of an environment.
   3. Temperature, light, air and water are the _____________ components of the environment.
   4. Green pkants which make their own food are called ______________.
   5. Living organisms that cannot make their own food are called __________________ or ______________.
   6. _________________ are carnivores that feed on dead animals.
   7. _________________ eat both plants and animals.
   8. An interaction in which one organism captures and eats another organism is called ________________.
5. 5.

   Differentiate between Environment and Ecosystem.

6. 6.

   Differentiate between Producers and Consumers.