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Science [3 Mark Questions]

MODEL PAPER - 2 [2026] · CBSE STD 10 (CBSE - English Medium). 2 questions.

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[3 Mark Questions]

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Question 13 Marks
A portion of destarched leaf of a potted plant was covered with a black strip of paper. The plant was exposed to sunlight for six hours and then tested for starch. What will be the observation?
Answer
The leaf turns blue-black except in the covered region. As this covered region did not receive light, photosynthesis did not occur. Hence no starch was formed there. The uncovered region received light and starch was formed there due to photosynthesis.
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Question 23 Marks
Differentiate between binary fission and multiple fission giving one example for each.
Answer
Binary fissionMultiple fission
A parent cell is present which on cytokinesis forms 2 daughter cells.A parent cell is present which forms multiple daughter cells.
It undergoes cytokinesis.It undergoes multiple divisions to form many daughter cells.
Occurs during favorable conditions.Occurs during unfavorable conditions.
most common form of reproduction in prokaryotes.most common form of reproduction in Protists and parasitic species.
both cytoplasm and nucleus divide togetherthe nucleus divides first and is surrounded by cytoplasm whose division occurs in the later stage.
Example: Bacteria, Amoeba, etc.Example: Plasmodium, Algae, etc.
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[3 Mark Questions] - Science STD 10 Questions - Vidyadip