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Science Do as instructed[4M]

Cell Structure and Micro-organisms · Maharashtra Board STD 7 (MSBSHSE - Semi English Medium). 2 questions.

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Do as instructed[4M]

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2 questions · self-marked practice — reveal the answer and mark yourself.

Question 14 Marks
What is the difference between us:
Simple microscope and Compound microscope.
Answer
Simple microscopeCompound microscope
1. It consists of single lens.1. It consists of 2 lenses.
2. Magnification power is upto 300X2. Magnification power is upto 2000X.
3. It uses natural light source.3. It uses illumination as light source.
4. It is used to observe small objects.4. It is used to observe very tiny objects or cells which we cannot see with naked eye.
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Question 24 Marks
What is the difference between us:
Prokaryotic cell and Eukaryotic cell
Answer
Prokaryotic cellEukaryotic cell
1. No well defined nucleus.1. Well defined nucleus with a nuclear membrane
2. Ribosomes are small.2. Ribosomes are large.
3. A single length of DNA is present.3. Several lengths of genetic materials (DNA) is present.
4. No other cell organelles are present.4. Several organelles like mitochondria, chloroplasts, etc. are present.
5. Examples: Bacteria, blue green algae5. Examples: Euglena, Amoeba, all plant and animal cells
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