The correct answer is (ii) Mitochondria and Nucleus because both contain DNA. Other options are incorrect since ribosomes, Golgi bodies and lysosomes do not contain DNA.
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(i) Test osmosis effect. (ii) Use equal size and weight carrots, measure weight. (iii) Plain water makes carrot stiff due to water gain; salt solution removes water, making it limp.
If mitochondria are removed, the cell cannot produce energy. Without energy, cellular activities stop and the cell eventually dies due to lack of ATP.
Plants need a rigid cell wall because they are fixed and must withstand environmental forces. Animals move and need flexible cells, so they do not have a cell wall.