Environment

Q.

Why we need to add manures and fertilizers to the soil?

Q.

Give any two ways in which biodegradable substances would affect the environment.

Q.

What are the resources that are found everywhere on the earth?

Q.

Define a pollutant. Classify the pollutants on the basis of their ability to degrade. Give examples.

Q.

(a) What is meant by 'environment'?

(b) What type of substances are the major pollutants of the environment? Name two such substances.

(c) Name the organisms whose uncontrolled activities are damaging the environment.

(d) Explain why it is better to use paper bags than plastic bags.

Q.

Which one term in the following includes the others? air, flora, fauna, environment, water, sunlight, soil

Q. The most significant source of energy in the solar system is.

1. Sun
2. Moon
3. Stars
4. Petroleum

Q. Why is it necessary to conserve our environment?

Q. World environment day is celebrated on ______

1. ${16}^{st}September$
2. $3^{rd}December$
3. $5^{th}June$
4. ${22}^{nd}April$

Q.

Our atmosphere is made up of many layers. The layer nearest to the surface of the earth is known as-

1. Geosphere

2. Stratosphere

3. Troposphere

4. none of the above

Q.
Outer layer of the earth is called ___________.

Q. What is the impact of garbage on the environment?

Q.

Soil helps to-

1. Clean the water

2. Remove the nutrients

3. Increases rains

4. Prevents flooding

Q. What is environment?

Q. Assertion :Ecology is the study of the relationship between living organisms and their environment. Reason: The biotic community and non-living environment of an area function together to form an ecosystem.

1. If both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. If both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. If assertion is correct but Reason is incorrect
4. If Assertion is incorrect but Reason is correct

Q. Identify the type of components of our environment shown in these figures:

1. 
2. 
3. 
4. 

Q.

What do you mean by dead zones?

1. Area where vegetation can survive.

2. Cold deserted areas where life can survive.

3. Areas where no vegetation and animal life can survive.

4. Areas where all animal life can survive.

Q.

As an individual, what would you do to reduce burden on natural resources?

Q.

Current concentration of $C{O}_2$ in atmosphere is:

1. 350 ppmv

2. 270 ppmv

3. 430 ppmv

4. 500 ppmv

Q. Which of the following does not lead to loss of biodiversity?

1. Overexploitation of resources
2. Deforestation for agriculture and constructions of houses
3. Invasion by alien species by introduction of dogs and cats in places where is not normally seen
4. Keeping animals in zoos

Q. The most significant source of energy in the solar system is.

1. Mercury
2. Stars
3. Sun
4. Moon

Q. Environment protection act was enforced in the year ____

1. 1986
2. 1958
3. 1925
4. 1900

Q. Greenhouse gases include____

1. Carbondioxide $\left(C{O}_2\right)$
2. Methane $\left(C{H}_4\right)$
3. Water vapour
4. All of the above

Q. Soil conservation means:

1. All of these
2. Prevention of spread of desert
3. To check soil erosion by wind and rains
4. To check soil erosion by afforestation

Q.

The lessons from Easter Island include:

1. Like the Islanders, humans on Earth have limited resources.

2. We too are depleting our resources to supply our growing population.

3. All of the above

4. We are irreversibly damaging our surroundings.

Q. Farming is very extractive in nature. Which of the following helped human beings overcome this?

1. Metal tools
2. Leguminous plant
3. Adding manure
4. All of the above

Q.

Which of the following is true?

1. All non renewable resources are exhaustible.

2. No renewable resource is exhaustible.

3. Some non renewable resources are non-exhaustible.

4. There is no relationship between resource renewal and resource exhaustion.

Q. Agriculture led to food safety and hence social organization.

1. True
2. False

Q. Unlike hunting for food, commercial hunting leads to lot of wastage of food.

1. False
2. True

Q.

Question 27
It is said, “$C{O}_2$ contributes to global warming.” Explain.