Question

Shreya set up an experiment to investigate the outcome when different cell parts of a balsam plant leaf are removed. The results are recorded as shown in the table given.

Cell Parts		Outcomes
P		The cell could not function properly
Q		Boiled leaf remained the same when iodine solution was added to it
R		The cell could not control the substances entering and exiting it
S		The cell lost its regular shape

Which one of the following best represents the cell parts P, Q, R and S?

• A. P - Nucleus, Q - Ribosomes, R - Cell wall, S - Cytoplasm
• B. P - Cytoplasm, Q - Chloroplast, R - Nucleus, S - Cell membrane
• C. P - Nucleus, Q - Chloroplast, R - Cell membrane, S - Cell wall
• D. P -Chloroplast, Q - Nucleus, R - Endoplasmic reticulum, S - Cell membrane

Answer 1

Answer: (C)

P - Nucleus, Q - Chloroplast, R - Cell membrane, S - Cell wall

The label P is the nucleus, a controlling centre of the cell. All the activities of the cell are controlled and regulated by the nucleus and the cell cannot function properly in the absence of it.

The label Q is the chloroplast responsible for making food in the form of starch which turns the iodine solution to bluish black. In the absence of chloroplast, the solution remains yellowish brown.

The label R is the cell membrane which controls the entry and the exit of the molecules.

The label S refers to the cell wall which maintains the shape of the cell.

Thus, the correct answer is option C.