Cell is the functional and structural unit of plants and animals.
A
Cell is the functional and structural unit of plants and animals.
B
All cells have nuclei.
C
All cells are living.
D
Cells divide by both mitosis and meiosis.
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Solution
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The cell theory that all the plants and animals are composed of cells and the cell is the basic unit of life, was presented by two biologists, Schleiden (1838) and Schwann (1839). In 1855, a German physiologist, Rudolf Virchow added a third principle to the cell theory. He gave the phrase, 'Omnis cellula-e-cellula', i.e., all cells arise from pre-existing cells. Later, discoveries led to the modification of cell theory. Modified cell theory is termed as cell principle or modern cell theory which postulates that all living organisms are composed of cells or cell products and arise from pre-existing cells. All cells are basically alike in chemical composition and metabolic processes. So, the correct answer is option D.
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Q1
All the plants and animals are composed of cells and the cell is the basic unit of life. Which theory states this?
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Q2
Mark the following statements 'true' or false. Rewrite the wrong ones correctly.
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(b) Chloroplasts are present in all plant cells.
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Q3
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Q4
The cell theory states that all living organisms are made up of cells.
Which of the following is a living organism not composed of cells?
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Q5
Cells are basic structural and functional units of living organisms.