Our Environment — Questions & Answers

Sample questions from Our Environment

1. Q1. Fungi and bacteria that break down dead plants and animals are called:

   • A.Producers
   • B.Primary consumers
   • C.Parasites
   • D.Decomposers✓
   Solution

   D is correct: decomposers break the complex organic matter of dead bodies and waste in simple inorganic substances, which return to the soil and the air to be used again by the producers. A make food from inorganic matter. B feed on producers. C live on a living host, which is a different relation.

2. Q2. Chain 13: Which organism is the producer in wheat → mouse → snake → eagle?

   • A.wheat✓
   • B.mouse
   • C.snake
   • D.eagle
   Solution

   The first organism in the chain is the producer.

3. Q3. Chain 2: Which organism is the secondary consumer in phytoplankton → small fish → large fish → bird?

   • A.small fish✓
   • B.phytoplankton
   • C.large fish
   • D.bird
   Solution

   The third organism shown is the secondary consumer.

4. Q4. The flow of energy in an ecosystem is

   • A.Cyclic
   • B.Unidirectional✓
   • C.Bidirectional
   • D.Random and reversible
   Solution

   Energy enters as sunlight and moves only from producers to consumers to decomposers; it never returns to the Sun, unlike nutrients which are recycled.

5. Q5. Chain 8: Which organism is the secondary consumer in nectar → butterfly → lizard → bird?

   • A.butterfly✓
   • B.nectar
   • C.lizard
   • D.bird
   Solution

   The third organism shown is the secondary consumer.

Other Class 10 Biology chapters