7th Grade > Chemistry
FORESTS OUR LIFELINE MCQs
Total Questions : 81
| Page 5 of 9 pages
Answer: Option B. ->
canopy
:
B
The canopy looks like a roof over other plants in the forest. It is formed by the leaves of an individual tall tree or by a group of trees. It restricts the sunlight and rains from getting to the layers beneath it.
:
B
The canopy looks like a roof over other plants in the forest. It is formed by the leaves of an individual tall tree or by a group of trees. It restricts the sunlight and rains from getting to the layers beneath it.
Answer: Option A. ->
True
:
A
Plants are primary producers of food. Herbivorous animals depend directly on plants for their food. Carnivorous eat these herbivouros animals and gain energy. Thus, ultimately they too depend on plants for food and energy.
:
A
Plants are primary producers of food. Herbivorous animals depend directly on plants for their food. Carnivorous eat these herbivouros animals and gain energy. Thus, ultimately they too depend on plants for food and energy.
Answer: Option A. ->
Bacteria
:
A and C
The microorganisms which convert the dead and decaying plants and animals to humus are known as decomposers. Bacteria and fungi, both are decomposers.
:
A and C
The microorganisms which convert the dead and decaying plants and animals to humus are known as decomposers. Bacteria and fungi, both are decomposers.
Answer: Option A. ->
Provide oxygen
:
A, B, and C
∙ Forest plays an important role in the survival of life on the Earth.
∙ The trees in forest absorb the carbon dioxide gas released by animals and give out oxygen which is required for the existence of life.
∙ They provide a natural habitat to a large number of species. It provides them with food, shelter, oxygen etc. Forests are also a good source of medicinal plants.
:
A, B, and C
∙ Forest plays an important role in the survival of life on the Earth.
∙ The trees in forest absorb the carbon dioxide gas released by animals and give out oxygen which is required for the existence of life.
∙ They provide a natural habitat to a large number of species. It provides them with food, shelter, oxygen etc. Forests are also a good source of medicinal plants.
Answer: Option A. ->
Forests
:
A
:
A
A forest is a large area dominated by trees and is known as the 'green lungs'. Since, they absorb carbon dioxide from the atmosphere and release oxygen during the day time. Oxygen is required for animal respiration. Thus, in this manner they maintain the balance of these gases in the atmosphere.
Answer: Option A. ->
True
:
A
Deforestation is the clearing of the Earth's forests on a massive scale. Forests provide habitat to a large number of species. On clearing the forests, they lose their habitat and start dying. Thus, many species can go extinct if forests are cleared.
:
A
Deforestation is the clearing of the Earth's forests on a massive scale. Forests provide habitat to a large number of species. On clearing the forests, they lose their habitat and start dying. Thus, many species can go extinct if forests are cleared.
Answer: Option D. ->
Plastic
:
D
:
D
A forest product is any material derived from forests which is used for direct consumption or commercial use. Henna dye, rubber and spices are all forest products. Whereas, plastic is processed from chemicals and is not a forest product.
Answer: Option B. ->
False
:
B
:
B
Water cycle depends on the number of trees. Forests help in bringing a good amount of rainfall. They act as natural absorbers of rainwater and allow it to seep through the ground which helps in maintaining the water table.
Answer: Option B. ->
Less noise pollution
:
A, B, and C
:
A, B, and C
A forest is a large area of land covered with trees or vegetation. It absorbs the noise from surroundings, brings good rainfall and keeps the weather pleasant.
Answer: Option B. ->
Root system of trees
:
B, C, and D
The closed canopy and many layers of vegetation in a forest slows down the speed of raindrops. The root system helps the water to seep into the ground. The fertile and porous soil absorbs the water and let it reach underground. All these factors prevent flooding.
:
B, C, and D
The closed canopy and many layers of vegetation in a forest slows down the speed of raindrops. The root system helps the water to seep into the ground. The fertile and porous soil absorbs the water and let it reach underground. All these factors prevent flooding.
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