Carbon Cycle

Q.

Which of the following actions does not release carbon dioxide?

1. Combustion

2. Photosynthesis

3. Respiration

4. Decomposition

Q. how many chiral carbon atoms are present in fructose?

Q. Plants absorb water from the soil or water reservoir and add it to the atmosphere as vapour by ___ .

1. Absorption
2. Respiration
3. Photosynthesis
4. Transpiration

Q.

Circle the odd one out. Give reasons for your choice.

respiration, photosynthesis, combustion, decay of dead plants and animals.

Q. The basis of C-14 dating method is that the:

1. C-14 fraction is the same in all objects
2. C-14 is highly unstable and is readily lost from the objects
3. The ratio of C-14 and C-12 in our atmosphere has always been constant.
4. Living tissue will not absorb C-14 but will absorb C-12 from its source of carbon

Q.

In photosynthesis, solar energy is captured by the pigment called ______ .

Q. as helium and argon are called monoatomic molecules and phosphorus is called tetra atomic molecule, what would carbon be called in such a way ?? in other words what is the atomicity of CARBON ??

Q. The number of sigma bonds formed between two atoms with four shared electrons are:

1. two
2. one
3. three
4. zero

Q. Read the following carefully to mark the correct option out of the options given below:

Statement I: $Si-Si$ bond is weaker then $Si-O$ bond.
Statement II: Silicon forms double bonds with itself.

1. c
2. a
3. b
4. d

Q. The process by which carbon sinks remove carbon dioxide ($C{O}_2$) from the atmosphere is known:

1. carbon absorber
2. carbon well
3. carbon sequestration
4. carbon chain

Q.

Name the part of a plant which produces its food.

Q. How many $\sigma$-bonds present in given compound ?

1. $6$
2. $12$
3. $18$
4. $24$

Q. Which element is the foundation of organic chemistry, as it occurs in all living organisms?

1. Carbon
2. Hydrogen
3. Nitrogen
4. Oxygen

Q. Phosphorus molecule having an atomicity of 4.

1. True
2. False

Q. Fill in the blanks in the following:
The process of changing water vapour into water is called___