Selina solutions for Concise Biology [English] Class 8 ICSE chapter 4 - Ecosystems [Latest edition]

Put a tick mark (✓) against the correct alternative in the following statement:

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

Put a tick mark (✓) against the correct alternative in the following statement:

Rat in any food chain would occupy the position of

Put a tick mark (✓) against the correct alternative in the following statement:

Evergreen broad-leaved trees are characteristic of

Put a tick mark (✓) against the correct alternative in the following statement:

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

Mention if the following statement is true or false 

Snakes are primary consumers 

Mention if the following statement is true  or false

Some humans are strictly primary consumers & some others are of other types of consumers also

Mention if the following statement is true or false .

No ecosystem can survive without light 

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

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

Snake → Grasshopper → Grass → Frog

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

Grass → Tiger → Deer

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

Snake → Peacock → Rat → Wheat

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

Define the term flora 

Define the term fauna.

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

Define the following term and give two examples.

Autotrophs

Define a consumer.

Give two examples of consumers.

Define the food chain and give two examples.

Define the following term and give two examples:

Symbiosis

Define the following term:

Parasitism

Give one example of parasitism.

Define the term predation.

Give two examples of predation.