OBJECTIVE LIFE SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A single-celled organism peforms all the life processes such as respiration, digestion, excretion, reproduction
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All cells in a living organism have same shape and size.
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The size of cells determines the size of body of a living organism.
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Number of cells has no relation with the size of body of the living organism.
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Detailed explanation-1: -Answer: Answer is (c) unicellular organisms respire and reproduce. Explanation: Unicellular are single-celled organisms where single cell performs basic functions such as respiration, digestion, and reproduction.
Detailed explanation-2: -In single celled organisms diffusion is sufficient to meet all their requirements of food, exchange of gases or removal of wastes but it is not in case of multicellular organisms.
Detailed explanation-3: -The one cell of a unicellular organism must be able to perform all the functions necessary for life. These functions include metabolism, homeostasis and reproduction. Specifically, these single cells must transport materials, obtain and use energy, dispose of wastes, and continuously respond to their environment.