Food chains and food webs in the environment Practice exercise 3

Describe the effects of removing one organism from a food web in a Kenyan forest ecosystem.  (2 marks)

Describe the effects of removing one organism from a food web in a Kenyan forest ecosystem.  (2 marks)

Describe the effects of removing one organism from a food web in a Kenyan forest ecosystem.  (2 marks)

James noticed that spiders in his garden catch insects for food. What would happen if there were no spiders?  (2 marks)

Using the food web provided, identify and write down two different food chains.  (2 marks)

Using the food web provided, identify and write down two different food chains.  (2 marks)

Using the food web provided, identify and write down two different food chains.  (2 marks)

Using the food web provided, identify and write down two different food chains.  (2 marks)

Wanjohi observed that goats in his compound feed on grass. Use this observation to explain what a consumer is. (2 marks)

Wanjohi observed that goats in his compound feed on grass. Use this observation to explain what a consumer is. (2 marks)

Using the food chain below, what would happen to the lion if all the rabbits died? (2 marks)

Using the food chain below, what would happen to the lion if all the rabbits died? (2 marks)

Using the food chain below, what would happen to the lion if all the rabbits died? (2 marks)

A farmer kills all the owls in his farm thinking they are harmful. What long-term effects would this have on the farm ecosystem? (2 marks)

How would the disappearance of grass affect the entire food web consisting of grass, zebras, gazelles, vultures, and lions?  (2 marks)

Use the table below to identify the possible food chain and explain how removal of the snake would affect the food web. (3 marks) Organism Possible Role in Food Web Example Link Grass Producer Grass → Grasshopper Grasshopper Primary Consumer Grasshopper → Frog Frog Secondary Consumer Frog → Snake Snake Tertiary Consumer Snake → Eagle Eagle Quaternary consumer —

Use the table below to identify the possible food chain and explain how removal of the snake would affect the food web. (3 marks) Organism Possible Role in Food Web Example Link Grass Producer Grass → Grasshopper Grasshopper Primary Consumer Grasshopper → Frog Frog Secondary Consumer Frog → Snake Snake Tertiary Consumer Snake → Eagle Eagle Quaternary consumer —

Use the table below to identify the possible food chain and explain how removal of the snake would affect the food web. (3 marks) Organism Possible Role in Food Web Example Link Grass Producer Grass → Grasshopper Grasshopper Primary Consumer Grasshopper → Frog Frog Secondary Consumer Frog → Snake Snake Tertiary Consumer Snake → Eagle Eagle Quaternary consumer —

What would happen to the population of lions in a savannah ecosystem if zebras were drastically reduced due to prolonged drought?  (2 marks)

Why is the eagle often found at the last level of a food chain in a forest ecosystem?  (2 marks)