Carbon

Q.

Biogas is a mixture of

1. Oxygen, carbon dioxide, methane

2. Nitrogen and oxygen

3. Methane, nitrogen, and hydrogen

4. None of these

Q.

CO₂ is called a greenhouse gas because

1. Transparent to heat but traps sunlight

2. Used in greenhouse to increase plant growth

3. Transparent to both sunlight and heat

4. Transparent to sunlight but traps heat

Q.

What is the chemical basis of life?

Q. Name a biologically important compound that contain both oxygen and nitrogen.

1. Proteins
2. Fats
3. Carbohydrates
4. Minerals

Q.

The supersonic jets cause pollution by the thinning of:

1. ${\mathrm{CO}}_2$ layer

2. ${\mathrm{SO}}_2$ layer

3. ${\mathrm{O}}_3$ layer

4. ${\mathrm{O}}_2$ layer

Q.

In a forest ecosystem, green plants are

1. primary producers

2. primary consumers

3. secondary consumers

4. decomposer

Q. Which of the following is a reservoir of carbon?

1. Oceans
2. Atmosphere
3. Terrestrial biosphere
4. Fossil fuel

Q.

Fossil fuels and metallic minerals are renewable resources.

1. Renewable resources

2. Combustable

Q.

How does the bulk fixation of carbon dioxide through photosynthesis take place?

Q. Which of the following is composed of carbon, oxygen and hydrogen?

1. Glucose
2. Graphite
3. Ammonia
4. Water

Q. Which of the following is composed of carbon, oxygen and hydrogen?

1. Glucose
2. Graphite
3. Ammonia
4. Water

Q.

Composted manure is produced from _____________.

1. Farmyard manure and green manure

2. Farm refuse and household refuse

3. Organic remains of biogas plants

4. Rotten vegetables and animals refuse.

Q. An ecosystem requires only one external input and that is

1. Soil
2. Water
3. Air
4. Solar energy

Q.

Vermicompost is rich in organic matter and nutrients and is derived from organic wastes of plant and animal origin by the activity of earthworms.

1. True
2. False

Q. What is green house effect? Why it is named so?

Q.

Is graphite a pure carbon?

Q. Describe greenhouse effect and global warming.

Q.

Carbon dioxide is important for the living world because

1. it is at the roots of the entire food chain

2. animals use it for photosynthesis

3. plants use it for respiration

4. animals use it for respiration

Q.

Give one word for :

Substance used to absorb hydrogen.

Q. Depletion of the ozone layer causes:

1. Blood cancer
2. Lung cancer
3. Breast cancer
4. Skin cancer

Q.

_______ warming is due to accumulation of greenhouse gases.

Q. What chemicals cause major damage to the protective ozone layer of the earth?

Q.

Molecules of carbohydrate, fats, and proteins contain

1. Carbon

2. Bromine

3. Chlorine

4. All of these

Q. Which of the following is not an elemental form of carbon?

1. Diamonds
2. Ozone
3. Graphite
4. Fullerenes

Q. Which of the following is composed of carbon, oxygen and hydrogen?

1. Glucose
2. Graphite
3. Ammonia
4. Water

Q.

Which of the following is the most vital component of all living forms?

1. Condensation

2. Evaporation

3. Raining

4. Thundering

Q.

Composting and vermicomposting

Q. The diagram shows the phenomenon of a natural disaster. Which of the following is an effect of the disaster?

1. Air pollution
2. Green house effect
3. Water pollution
4. Sound pollution

Q. If there was no carbon dioxide in the earth's atmosphere, the temperature of the earth would be

1. Higher than the present
2. Dependent on the amount of oxygen in the atmosphere
3. Less than the present
4. The same

Q. Which amidst these does not form organic molecules in living beings?

1. Carbon
2. Nitrogen
3. Sulphur
4. Aluminium