Why do organisms need to take food?

3

(a)

Distinguish between a parasite and a saprotroph.

3

(a)

How would you test the presence of starch in leaves?

3

(a)

Show with the help of a sketch that the plants are the ultimate source of food.

3

(a)

Different modes of nutrition has been observed in plants. What are they? Give example of each.

3

(a)

Plants are considered an essential part of earth as they keep a check on lot of process occurring all over. What would happen if all the green plants are wiped from earth?

3

(a)

Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

3

(a)

Observe the given figure and label the following terms given in the box. Stomatal opening, guard cell

3

(a)

Nitrogen is an essential nutrient for plants growth. But farmers who cultivate pulses as crops like green gram, bengal gram, black gram, etc., do not apply nitrogenous fertilisers during cultivation. Why?

3

(a)

Water and minerals are absorbed by the roots and then transported to leaves. How?

3

(a)

Some plants have deep red, violet or brown coloured leaves. Can these leaves perform the photosynthesis process?

3

(a)

In the absence of photosynthesis, life would be impossible on earth. Is it true or false?

3

(a)

1. (a) Identify the following figure and label the parts marked as A and B.

(b) Which position of stomata-open or closed, has been shown in the figure?

3

(a)

Vivek went to visit his grandfather in village where he saw that his grandfather's field of wheat is infected with fungus but no one is aware of this. Vivek told him that he should use an antifungal agent in his fields to stop this infection?
(a) What is fungus?
(b) Can fungus only cause disease or can it be helpful also?
(c) What values are shown by Vivek?

3

(a)

Ashish went to visit his grandfather in his village. He told her grandfather to plant crops like pulses, gram, beans, etc. for a year then follow with regular crops. It will increase the crop productivity.
(a) What will you name the process suggested by Ashish?
(b) What are noted benefits of this process?
(c) What values are shown by Ashish ?

3

(a)