Cell - Structure And Functions - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Long Q&A:
Q1: What is Cell? Define its components.
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Ans:
Cell is the structural unit of living organisms.
Components:
Cytoplasm is a jelly-like substance present between the cell membrane and nucleus.
Nucleus is spherical shaped component located in the centre of the cell. It acts as control centre of activities of cell.
Plasma membrane is a porous membrane surrounding the cytoplasm.
Q2: Define "Why plants need cell wall?"
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Ans:
Cell wall provides rigidity to plant cell. This provides plant cell protection against the variation of environmental condition like variation in temperature, humidity etc.
Q3: Compare plant and animal cell on basis of cellular components.
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Ans:
Comparison between plant and animal cell:
Part
Plant Cell
Animal Cell
Cell membrane
Cell wall
Nucleus
Nuclear membrane
Cytoplasm
Plastids
Vacuole
Present
Present
Present
Present
Present
Present
Present, large single
Present
Absent
Present
Present
Present
Absent
Present, small numerous
Q4: "Single cell organisms perform all the function that multicellular organisms perform." Define what functions are these. Also define who perform all these function in multicellular.
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Ans:
Single- celled organism performs all function that multicellular organisms perform. These functions are capturing and digestion of food, respiration, excretion, growth and reproduction.
In single-celled organism these function are performed by overall cell. However, in muticellular organism each function is performed by specific organ.
