Selina solutions concise biology class 8 icse Solutions for Chapter 4 ecosystems

Q1) Differentiate among primary, secondary and tertiary consumers. Give one example each in a food chain.

Q2) Define the term (a) Flora and (b) Fauna

Q3) List any three members each of the flora and fauna of tropical rain forests.

Q4) Define the following terms and give two examples in each case.

(a) Symbiosis

(b) Parasitism

(c) Predation

Q1) Put a tick mark against the correct aalternative in the following statements:

a. The term “ecosystem” is derived from the Greek word “oikos” meaning.

1. Body weight

2. Food

3. House

4. Size

b. Rat in any food chain would occupy the position of

1. Tertiary consumer

2. Secondary consumer

3. Primary consumer

4. Producer

c. Evergreen broad-leaved trees are characteristic of

1. Tropical rainforest

2. Temperate deciduous forest

3. Coniferous forests

4. All of the above types of forests.

d. The number of steps in a food chain can never be more than

1. Four

2. Five

3. Six

4. Seven

Q1) Mention if the following statements are True (T) or False (F):

a. Snakes are primary consumers.

b. Some humans are strictly primary consumers while others are secondary or tertiary consumers as well.

c. No ecosystem can survive without light.

d. Cattle go to ponds for drinking water, so they are a constituent of pond ecosystem.

Q2) Match the items in Column I with as many items as possible in Collumn II.

Q3) Rewrite the following in their correct sequence in a food chain:

(a) Snake – Grasshopper – Grass – Frog

(b) Grass – Tiger – Deer

(c) Snake – Peacock – Rat – Wheat