Cells regulate growth through controlled division, contact inhibition and programmed cell death. These processes maintain balance by preventing excessive growth and removing unwanted or damaged cells.
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Water moves into Cell X in pure water, causing swelling and moves out of Cell Y in salt solution, causing shrinking. The correct explanation is option (iii).
Renu is correct because all plant cells, including roots, contain plastids. Roots have leucoplasts for storage, even though they lack chloroplasts for photosynthesis.
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.
(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.