Ecosystem

Q. What are forests products

Q.

Give reasons for the following:

Decomposers help in keeping the environment clean.

Q.

“A bunch of seedlings was seen sprouting on a heap of animal dropping in a forest.” How do you think the seedling benefited from the animal dung?

Q.

What is the importance of decomposers in the forest?

1. They help in the process of recycling of nutrients by decomposing various dead organisms to form humus.

2. They help in the process of developing humus by decomposing various dead organisms to form nutrients.

3. They help in the process of recycling of forests by decomposing various dead organisms to form nutrients.

4. They help in the process of rebuilding of forests by decomposing various dead organisms to form nutrients.

Q. What is forestry of India

Q.

A food __ is made up of several connected food chains.

Q.

How is carbon dioxide harmful for our environment?

Q. Global warming is slow and steady in the Earth's surface temperature.

1. rise
2. drop
3. decrease
4. change

Q. Which of the following is not a forest product?

1. Gum
2. Ply wood
3. Sealing wax
4. Kerosene

Q. Decaying animal dung provides ____ for the seedlings to grow.

1. oxygen
2. nutrients
3. canopy
4. habitat

Q.

What is the role of detritus in the swamp?

Q. If saprophytic organisms disappear from earth, what would be the effect?

1. Absorption of sunlight by plants will reduce
2. Rate of photosynthesis will decrease
3. Dead organisms will not decompose and the earth will remain dirty
4. There will be no food for human beings

Q. Which of the following is not a forest product?

1. Matchstick
2. Plywood
3. Kerosene
4. Paper

Q.

Question 13

Paheli wrote a food chain in the following way:
$Frog\to eagle\to insects\to grass\to snake$
The chain is not in the correct order. Help her to write the food chain correctly

Q. (1)

Read the following statement and give the appropriate term for them. ​

(a)The process of breakdown of rocks by the action of wind, wa

(2)

Read the following statement and give the appropriate term for each of them.​

(b) Removal of topsoil during heavy rains or strong winds.

(3)
Read the following statement and give the appropriate term for each of them. ​

(c) Accumulation of wastes in the soil generated by human activity which alter the features of the soil.

(4)
Read the following statement and give the appropriate term for each of them.​

(d) The process of movement of water into deeper layers of soil.

Q.

Question 1

Which of the following serve as green lungs?
(a) Green pigment of the plants
(b) Forests
(c) Kitchen gardens
(d) Greenhouse gases

Q.

Balance between oxygen and carbon dioxide in atmosphere is depicted through the following diagram. Match the numbers with the correct gas name.

9 

Q. Which of the following cause global warming by enhancing greenhouse effect?

1. Carbon dioxide
2. Methane
3. Oxygen
4. Jet planes

Q. Mountains are part of the natural ecosystem.

1. True

2. False

Q.

The decaying leaves and animal droppings in a forest enrich the ___

Q.

Decomposers decompose the dead animals into minerals.

1. True
2. False

Q.

Question 25

"Forests are our lifeline". Write five sentences on this topic.

Q.

Is forest an ecosystem? Why or why not? Give examples. [5 MARKS]

Q. An area consisting of plants, animals and microbes along with the non-living components is known as:

1. Zoo
2. Ecosystem
3. Sanctuary
4. Atmosphere

Q. Enhanced greenhouse effect leads to .

1. global warming
2. pollution
3. deforestation

Q.

Generally, a leaf performs the function of photosynthesis. Does the stem prepare food for any plant?

Q.

Question 13
Microorganisms act upon the dead plants to produce

(i) sand
(ii) mushrooms
(iii) humus
(iv) wood

Q.

Name some trees that grow in forests which have great commercial potential. [2 MARKS]

Q. The water that comes down as rain infiltrates through the soil.

1. True
2. False

Q.

What is global warming?

1. Slow and steady rise in the earth's surface temperature
2. Sudden harmful rise in the earth's surface temperature
3. Slow and steady decrease in the entire earth's temperature
4. Sudden harmful decrease in the entire earth's temperature