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Question

Shreya set up an experiment to investigate the outcome when different cell parts of a plant leaf are removed. The result are recorded as shown in the table given.
Cell partsOutcomesPThe cell could not function properly and diedQBoiled leaf remained the same when iodinesolution was added to it.RThe cell could not control the substancesentering and exiting itSThe cell lost its regular shape
Which of the following best represents the cell parts P, Q, R and S?

A
PQRSNucleusRibosomeCell wallCytoplasm
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B
PQRSNucleusChloroplastCell membraneCell wall
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C
PQRSCytoplasmChloroplastNucleusCell membrane
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D
PQRSChloroplastNucleusERCell membrane
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Solution

The correct option is B PQRSNucleusChloroplastCell membraneCell wall
-The nucleus controls all the functions of a cell. If the nucleus is removed the cell functioning will be adversely affected.
-Iodine test is to detect the presence of starch. Chloroplasts are responsible to produce 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.
-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.
-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.

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