Role of CHO

Q. Read the following statements.
1. Carbon, hydrogen, oxygen and nitrogen are micronutrients
2. Potassium and chlorine are macronutrients and help in maintaining anion-cation balance in cells
3. Some plants growing near nuclear test sites take up radioactive strontium
4. Potassium can alter the osmotic potential of a cell
How many of the above statements are correct?

1. One
2. Two
3. Four
4. Three

Q. Read the following statements.
1. Carbon, hydrogen, oxygen and nitrogen are micronutrients
2. Potassium and chlorine are macronutrients and help in maintaining anion-cation balance in cells
3. Some plants growing near nuclear test sites take up radioactive strontium
4. Potassium can alter the osmotic potential of a cell
How many of the above statements are correct?

1. One
2. Two
3. Three
4. Four

Q.

State any two precautions to be taken while handling radioactive substance.

Q. Identify the element which is an essential component of all the organic compounds in plants, but not absorbed from the soil

1. Nitrogen
2. Magnesium
3. Carbon
4. Phosphorus

Q.

Which element is obtained by plants in both gaseous and liquid form?

1. Hydrogen

2. Nitrogen

3. Oxygen

4. Carbon

Q. What is the role of carbon in our body?

Q.

The most abundant element found in plants is

1. Nitrogen

2. Carbon

3. Iron

4. Manganese

Q.

Which element is obtained by plants in both gaseous and liquid form?

1. Oxygen

2. Carbon

3. Hydrogen

4. Nitrogen

Q.

Q=Which is the most abundant element present in the plants?

Q. How many water molecule splite during light reaction for evolution of $4$ oxygen molecule?

1. $2$
2. $4$
3. $6$
4. $8$

Q.

The most abundant element found in plants is

1. Nitrogen

2. Carbon

3. Iron

4. Manganese