FOREST CLASS 7 CBSE
Objective-Type Questions
A. Tick (✓) the
correct options.
- What is the role of forests
in reducing the effects of climate change?
- a. They have no role in
reducing the effects of climate change.
- b. They absorb carbon
dioxide, a greenhouse gas, that contributes to climate change. ✓
- c. They increase the amount
of carbon dioxide in the atmosphere.
- d. They cause sea levels to
rise and cause floods.
- Which layer of the forest
receives the most sunlight?
- a. emergent layer ✓
- b. canopy
- c. understorey
- d. forest floor
- Which of the following organisms
are producers in a food chain?
- a. wolves
- b. snakes
- c. trees ✓
- d. lions
- What is the role of
decomposers in a food chain?
- a. to break down dead
organisms and recycle nutrients ✓
- b. to produce food for
other organisms
- c. to eat other organisms
for energy
- d. to compete with other
organisms for resources
- How do forests prevent soil
erosion?
- a. by cutting down trees
- b. by increasing the speed
of the wind
- c. by slowing down the flow
of water ✓
- d. by increasing the amount
of soil exposed to sunlight
B. Choose
the correct word to fill in the blanks.
- The layer of vegetation in a
forest below the canopy is known as the ______________. understorey
- A ______________ is a
network of interconnected food chains in an ecosystem. food web
- The increase in the Earth's
average temperature due to the trapping of heat by gases in the atmosphere
leads to ______________. global warming
- The clearing of trees in
forests, especially for commercial purposes, is called ______________. deforestation
- Animals that eat both plants
and other animals are called ______________. omnivores
Crossword Puzzle
ACROSS
2. Animals
that eat dead plants and animals in the forest: Scavengers
3. Animals
that eat only plants and leaves in the forest: Herbivores
DOWN
1. Organisms
that make their food using sunlight in the forest: Producers
2. Process
of clearing forest land to grow crops: Shifting Cultivation
3. Cutting
down of trees in the forest to sell the wood: Deforestation
Short-Answer Questions
1. How
does the canopy provide a habitat to many living beings in the forest?
o
The canopy provides a habitat to many living
beings by offering shelter, food, and protection from predators. It supports a
diverse range of organisms, including birds, insects, and arboreal mammals,
creating a unique ecosystem.
2. What
role do the forests play in the purification of air?
o
Forests play a crucial role in purifying the air
by absorbing pollutants, such as carbon dioxide, and releasing oxygen through
the process of photosynthesis. This helps improve air quality and mitigate the
effects of pollution.
3. How
do forests prevent soil erosion?
o
Forests prevent soil erosion by stabilizing the
soil with their root systems, reducing surface runoff, and minimizing the
impact of wind and water on the soil. The leaf litter and vegetation cover also
help protect the soil from erosion.
4. Name
any three useful products that we get from forests.
o
Timber, medicinal plants, and fruits are three
useful products that we get from forests.
5. Differentiate
between primary and secondary consumers.
o
Primary consumers are herbivores that feed on
plants (e.g., deer), while secondary consumers are carnivores that feed on
primary consumers (e.g., wolves).
Long-Answer Questions
1. Explain
in detail any four factors that are responsible for the destruction of forests.
o
Logging: The removal of trees
for timber and other products.
o
Agriculture: Clearing forests
for crop cultivation and grazing land.
o
Urbanization: Expanding cities
and infrastructure, leading to deforestation.
o
Mining: Extracting minerals and
resources from forested areas.
2. Describe
the food web with an example.
o
A food web is a network of interconnected food
chains in an ecosystem. For example, in a forest ecosystem, plants (producers)
are eaten by herbivores like deer (primary consumers), which are then eaten by
carnivores like wolves (secondary consumers). Decomposers like fungi and
bacteria break down dead organisms, returning nutrients to the soil for plants
to use.
3. Explain
in detail the different layers of a forest with examples.
o
Emergent Layer: The topmost
layer with tall trees like the Kapok tree that receive the most sunlight.
o
Canopy Layer: The dense layer
of foliage below the emergent layer, home to many animals like monkeys and
birds.
o
Understorey Layer: The layer
beneath the canopy with smaller trees and shrubs, providing habitat for insects
and small mammals.
o
Forest Floor: The bottom layer
with decomposing leaves, fungi, and microorganisms that break down organic
matter.
4. Describe
any four ways of conserving forests.
o
Reforestation: Planting trees
in deforested areas.
o
Sustainable Logging: Practicing
responsible logging methods to allow forests to regenerate.
o
Establishing Protected Areas:
Creating national parks and wildlife sanctuaries.
o
Raising Awareness: Educating
people about the importance of forests and conservation efforts.
5. What
are the effects of deforestation? Explain in detail.
o
Deforestation leads to loss of biodiversity,
disruption of the water cycle, increased greenhouse gas emissions, soil
erosion, and negative impacts on indigenous communities. It also contributes to
climate change and the degradation of ecosystems.
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