Gautam observed a plant cell and an animal cell under electron microscope and found one organelle that is present only in animal cells but not in plant cells. The figure of this organelle is shown alongside.

(a) What is this structure called ?

(b) It contains one or two dot-like dense bodies, surrounded by microtubules. Name them.

(c) Write one important role of the above mentioned structure.

Study the diagram given below and answer the questions that follow:

(a) Identify the unicellular organism shown above.

(b) Is it a prokaryotic or eukaryotic cell ?

(c) Name the spherical bodies composed mainly of RNA, shown by (A).

(d) Mention one difference between the cellular structures shown by (B) and (C) with respect to permeability.

(e) Write one important role of the structure shown by (D).

Assertion (A): Leukoplasts are colourless plastids as they have no pigments.

Reason (R): Leukoplasts are normally found in the non-photosynthetic parts of a plant.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Cristae are the finger-like projections arising from the inner walls of mitochondria.

Reason (R): These projections increase the surface area of the inner membrane and help in the production of ATP.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.