Carbon Cycle

Q. If a plant is releasing carbon dioxide and taking in oxygen during the day, This means that there is no photosynthesis occurring during the day time.

1. True
2. False

Q.

What is the energy cycle?

Q.

What is the carbon cycle?

Q.

The most abundant greenhouse gas is ___.

1. Carbon dioxide

2. Nitrous Oxide

3. Water Vapour

4. Methane

Q.

What is carbon fixation and how does it relate to photosynthesis?

Q.

What is the role of sunlight in the ecosystem?

Q. When it rains, the atmospheric carbon combines with rain water to form which dissolves the rocks. This process is called

1. carbonic acid
2. sulphuric acid
3. chemical weathering
4. physical weathering

Q.

Question 40
If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your answer.

Q. Which of the following processes take place in all living organisms?

1. Transpiration
2. Respiration
3. Photosynthesis
4. All of these processes

Q.

Do germination of seeds require oxygen

Q.

How is carbon cycled through an ecosystem?

Q.

Which of the following are greenhouse gases?

(i) Water Vapour

(ii) Carbon Dioxide

(iii) Nitrous Oxide

(iv) Methane

1. Only (i) and (iv)

2. Only (ii) and (iii)

3. Only (i), (ii) and (iii)

4. (i), (ii), (iii) and (iv)

Q.

Pathway of energy flow from sun to the organisms is:

Solar energy -> Green plants -> Herbivorous animals -> Carnivorous animals

True or False?

1. True

2. False

Q.

What is happening to the amount of carbon dioxide in the atmosphere?

1. It is increasing

2. It is decreasing

3. It is fluctuating wildly

4. It is holding steady

Q.

All plants and animals respire by reducing carbohydrates in their cells to produce energy and give out carbon dioxide into the atmosphere.

True or False?

1. True

2. False

Q. Explain carbon cycle in ecosystem. Give a linear diagram of carbon cycle.

Q. Explain the significance of photosynthesis.

Q.

Greenhouse gases do not play an important role in keeping the climate warm.

True or False?

1. True

2. False

Q.

If glucose is synthesised in plants and we eat that plant than why do we need to synthesise glucose again in our body

Q.

Does photorespiration regenerate any RuBP at all?

Q. State any two differences between phosphorus and carbon cycle in nature.

Q.

Why is the energy flow considered as unidirectional? [2 MARKS]

Q. In carbon cycle processes, carbon is used by plants to form organic molecules but most carbon is found in the atmosphere as carbon dioxide.
Which process is most responsible for removing carbon dioxide from the atmosphere?

1. Photosynthesis
2. Respiration
3. Combustion
4. Decopmosition
5. Evaporation

Q. The source of energy for carbon assimilation is

1. sunlight
2. $C{O}_2$
3. water
4. chlorophyll

Q. Short / Long Answer Type Questions :
Explain with the help of a flow chart recycling of phosphorus in nature. Describe the role of living organisms in the cycle. How is phosphorus cycle different from carbon cycle in nature?

Q.

is photosynthesis a cycle ? why ?

Q. Write a short note on carbon cycle.

Q. Role of bacteria in carbon cycle is

1. Photosynthesis
2. Chemosynthesis
3. Breakdown of organic compounds
4. Assimilation of nitrogen compounds

Q. Select incorrect statements about the carbon cycle.

1. Carbon dioxide levels fluctuate during the year.
2. Carbon dioxide levels are rising because of consumption of fossil fuels.
3. Atmospheric carbon dioxide will eventually be transferred to the oceans.
4. Carbon dioxide levels are up because of the burning of forests.
5. Carbon dioxide levels can be reduced by cleaning the gases that leave the smokestacks of power generating facilities.

Q.

The ultimate source of energy for all living beings is ___________________ .