Question

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Answer 1

Question 1:

Give one example showing the process of diffusion

Answer:

The exchange of gases like oxygen and carbon dioxide through the stomatal pore present in the leaves of plants is an example for diffusion.

Question 2:

Give the main difference between diffusion and osmosis

Answer:

Osmosis requires the presence of a semi permeable membrane and only the movement of solvent particle occurs while diffusion does not require a semi permeable membrane and both solvent and solute particles move till equilibrium is attained.

Question 3:

Why are companion cells and sieve tubes called sister cells?

Answer:

Both of them depend on each other to complete their functions. Since sieve tubes lack nucleus, the functions of sieve tubes are regulated by the nucleus of the companion cell.

Question 4:

Give two examples of macronutrients

Answer:

Macronutrients are elements which are present in large amounts in the tissues of the plants.

Some examples are: Nitrogen, Carbon, Oxygen, Hydrogen, Potassium, Calcium, Magnesium etc.

Question 5:

Which cells form the tracheid elements of xylem

Answer:

Tracheids consist of cells which are narrow , long and hollow without perforations.

Question 6:

List two diseases caused by the deficiency of nutrients in plants:

Answer:

Chlorosis: Yellowing of leaf due to loss of chlorophyll due to deficiency of Nitrogen, Potassium, Molybdenum, Magnesium, Manganese, Iron.

Necrosis: Death of plant tissue resulting in brown spots in leaves due to the deficiency of calcium, copper, magnesium, potassium.