Class Notes NCERT Solutions for CBSE Students
Question: ‘Cells are the basic structural units of living organisms’. Explain.
Answer: Cells constitute various components of plants and animals. A cell is the smallest unit of life and is capable of all living functions. Cells are the building blocks of life. This is the reason why cells are referred to as “the basic structural and functional units of life”. All cells vary in their shapes, sizes, and activities they perform. In fact, the shape and size of the cell is related to the specific function it performs.
Question: State the difference between eukaryotes and prokaryotes.
Answer: Difference is as follows:
Prokaryotes
Eukaryotes
1. Most prokaryotes are unicellular
1. Most eukaryotes are multicellular.
2. The nucleus is poorly defined due to the absence of a nuclear membrane.
2. The nucleus is well defined and is surrounded by a nuclear membrane.
3. Nucleolus is absent
3. Nucleolus is present.
4. Cell organelles such as plastids, mitochondria, golgi bodies, etc. are absent.
4. Cell organelles such as plastids, mitochondria, golgi bodies, etc. are present.
5. Bacteria and blue-green algae are prokaryotic cells.
5. Fungi, plant, and animal cells are eukaryotic cells.
