Forests: Our Lifeline quiz

The roof formed by the crowns of tall trees is called the:

The branchy part of a tree above the stem is the:

Organisms that convert dead matter into humus are:

In a food chain, the producer is a:

Forests help to prevent floods by:

Which gas do plants release during photosynthesis?

Which is NOT a forest product?

Cutting down forests on a large scale is called:

The dark, nutrient-rich layer formed from dead leaves is:

Which of these is a decomposer?

Why do we see very few herbs on the floor of a dense forest? (2 marks)

Name two animals that disperse seeds in a forest. How do they do it? (2 marks)

What is a food web? How is it different from a food chain? (2 marks)

Why is the forest floor soft and spongy? (2 marks)

How do forests help in maintaining the water cycle? (2 marks)

Name two medicinal plants or products obtained from forests. (2 marks)

Why is it said that "nothing goes waste in a forest"? (2 marks)

What would happen to herbivores if all the grass in a forest disappeared? (2 marks)

Why do plants in a forest grow in layers? (2 marks)

Give two reasons why forests should be conserved. (2 marks)

India's forest and tree cover is about 25 percent of its geographical area of about 32.9 lakh square km. Find the approximate area under forest and tree cover. (3 marks)

In a food chain grass -> deer -> tiger, only about 10 percent of the energy passes from one level to the next. If grass has 10,000 units of energy, how much reaches the deer and the tiger? (3 marks)

A school planted 240 saplings. 85 percent survived after a year. How many survived? If each tree absorbs about 20 kg of carbon dioxide per year when grown, how much will the surviving trees absorb in a year? (3 marks)

A forest area of 500 hectares loses 4 percent of its trees every year. How many hectares are lost in the first year? Why is this dangerous over 10 years? (3 marks)

Arrange these in a food chain with five links and count the consumers: hawk, grasshopper, grass, snake, frog. Which is the tertiary consumer? (3 marks)

Read the passage and answer the questions. Tibu, a boy living near a forest, took Boojho and Paheli inside. They noticed that it was cooler and darker than the village and the ground was covered with dead leaves. (i) Why was the forest cooler? (ii) Why was it darker? (iii) What happens to the dead leaves over time? (5 marks)

Read the passage and answer the questions. After heavy rain, a hill with forests had clear streams, but a nearby bare hill had muddy water and small landslides. (i) Why was the water muddy near the bare hill? (ii) How did the forest protect the soil? (iii) Suggest one way to protect the bare hill. (5 marks)

Read the passage and answer the questions. In a forest, a deer eats grass, a tiger eats the deer, and when the tiger dies, its body is broken down by bacteria and fungi. (i) Write the food chain. (ii) What role do bacteria and fungi play? (iii) How do nutrients return to the soil? (5 marks)

Read the passage and answer the questions. A city near a deforested area began to face hotter summers, less rain and more dust storms. (i) How did loss of forests reduce rain? (ii) Why are there more dust storms? (iii) Name two other effects of deforestation. (5 marks)

Read the passage and answer the questions. Villagers living near a forest collect honey, gum, fruits and dry wood, and they protect the forest from fires and cutting. (i) Name two products collected by them. (ii) Why do they protect the forest? (iii) How does this help the environment? (5 marks)

Draw a labelled diagram of the layers of a forest and describe the plants and animals found in each layer. (6 marks)

Explain the role of decomposers in a forest with a cycle diagram showing how nutrients move from plants to animals to soil and back to plants. (6 marks)

Explain five reasons why forests are called our lifeline. (6 marks)

Draw a food web of a forest with at least eight organisms. Explain what would happen if all the frogs were removed. (6 marks)

Describe the effects of deforestation on soil, rainfall, climate, wildlife and people. Draw a flowchart showing how deforestation leads to floods. (6 marks)