A plant requires magnesium for

Which of the following element helps in maintaining the structure of ribosomes?

Plants take zinc in the form of:

The major role of minor elements inside living organisms is to act as:
1. Co-factors of enzymes
2. Building blocks of important amino acids
3. Constituent of hormones
4. Binder of cell structure

Cytochrome is:
1.  Metallo flavo protein
2.  Fe containing porphyrin pigment
3.  Glycoprotein
4.  Lipid

Assertion: Micronutrients function in plants mainly as cofactors.
Reason: Iron is a metallic component of cytochromes.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

Necrosis of young leaves is a symptom of deficiency of calcium in plants indicating that calcium:
1. is a relatively immobile nutrient in plants.
2. is tied up in formed chlorophyll molecules.
3. is concentrated in the xylem of older leaves.
4. is concentrated in older leaves.

Identify the incorrectly matched pair: