Class 7 Forests Our Lifeline

From the given image, identify the tree name.

• Neem

• Sheesham

• Semal

• Bamboo

From the given image, identify the tree name.

• Neem

• Sheesham

• Semal

• Bamboo

What is canopy?

• Branchy part of a tree

• The branches of the tall trees look like a roof over the other plants in the forest

• Micro-organisms feed upon the dead plant and animal tissues and convert them into a dark coloured substance

• The micro-organisms which convert the dead plants and animals to humus

This is said to form a food chain: Grass→ insects→ frog→ snake→ eagle. Is it TRUE OR FALSE.

• False

• True

Do all food chains are linked and if any one food chain is disturbed, it affects other food chains?

• True

• False

Why forests are called lungs?

• Plants release oxygen through the process of photosynthesis.

• The plants help to provide oxygen for animal respiration.

• They also maintain the balance of oxygen and carbon dioxide in the atmosphere.

• ALL OF THE ABOVE

In water cycle, trees take in water from their roots and release water vapour into the air through __________

• Vaporization

• Evaporation

• Condensation

• Respiration

Explain how animals dwelling in the forest help it grow and regenerate.

• Animals help in pollination which helps in growing & dispersing a number of plants.

• Microorganisms work on dead bodies of plants and animals and degenerate them.

• Herbivores helps the carnivores to grow as they serve as food for them. Thus the food chains and food web get maintained.

• ALL OF THE ABOVE

Name any two of decomposers.

• Fungi

• Bacteria

• Oxygen and carbon dioxide

• Both Bacteria and Fungi

Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.

• Plants release oxygen in the environment during photosynthesis. This oxygen is inhaled by the animals for respiration. During respiration, they release carbondioxide which is absorbed by plants. In this way the oxygen and carbon dioxide cycle goes on.

• They pollute the soil and environment of the forest

• Forest has no role in maintaining the balance between oxygen and carbon dioxide in the atmosphere. That is why the air of forest always stays polluted.

• NONE OF THESE