Question

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

Cell Parts	Outcomes
P- Nucleus	The cell could not function properly and died.
Q-Chloroplast	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

Identify the parts R and S and write one function that best represents P, Q, R and S.
[5 Marks]

Answer 1

Cell Parts	Outcomes	Function
P-Nucleus	The cell could not function properly and died.	The nucleus controls all the functions of a cell. If the nucleus is removed the cell functioning will be adversely affected. [1 Mark]
Q- Chloroplast	Boiled leaf remained the same when iodine solution was added to it.	Iodine test is to detect the presence of starch. Chloroplasts are responsible for producing it by photosynthesis. If chloroplasts are removed, no photosynthesis takes place and hence, no starch will be formed. The leaves will answer a negative test for starch. [1 Mark]
R-Cell membrane [0.5 Marks]	The cell could not control the substances entering and exiting it.	The cell membrane also known as the plasma membrane is a selectively permeable membrane. It allows only selected substances (solids and liquids) to pass through it. If the cell membrane is removed, there will be no check on the substances entering and exiting the cell. [1 Mark]
S-Cell wall [0.5 Marks]	The cell lost its regular shape	Cell walls are present in plant, fungal and bacterial cells. In plants, they are responsible for maintaining the shape of the cell and providing structural and mechanical support to the plant cell. If the cell wall is removed, the plant cell loses its structure. [1 Mark]