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Question
Give reason:
Monocytes are called scavengers.
Solution
At the site of infection monocytes enlarge and differentiate into macrophages which engulf microorganisms and remove cell debris.
Hence they are also called scavengers.
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Long Answer Type Questions:
Differentiate between herbivores, carnivores, and omnivores. Give two examples of each
Fill up the blank with the words given:
Tiger is a __________ because it eats only meat.
Match the following
| 1. | Biotic factor | Terrestrial Ecosystem |
| 2. | Sewage | Land pollution |
| 3. | Fertilizers | Air pollution |
| 4. | Desert | Water Pollution |
| 5. | Smoke | Animals |
What happens to the dead organisms of animals and plants?
Explain the role of decomposers in the environment?
Given below are names of some animals.
- Goat
- Human beings
- Cockroach
- Eagle
Which of the above animals form a pair of omnivores?
Identify the animals in the grid given below as Figure and categorise them into herbivore, carnivore and omnivore.
| T | A | c | O | W | 0 | L | F |
| T | A | R | W | X | G | 0 | R |
| N | N | 0 | L | 1 | 0 | N | 0 |
| E | T | W | Q | L | A | N | G |
| H | U | M | A | N | T | W | 0 |
Read the names of animals written in the inner ring of Figure. Within the second ring write the types of food they eat and the category to which they belong (based on the eating habit) in the outermost ring. One example has been worked out for you. Use red, green and blue colours for writing.
Match the following Column I with Column II.
| Column I | Column II |
| A. Mesozoic | (i) First land vertebrates |
| B. Devonian | (ii) Proliferation of reptiles |
| C. Palaeocene | (iii) Raise of modern mammals |
| D. Permian | (iv) Radiation of primitive mammals |
| (v) 166 million years |
