Cancer cells grow uncontrollably due to loss of regulation. They form tumours and can spread to other parts of the body, damaging normal tissues and disrupting body functions.
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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.
Cell membrane is selectively permeable, while cell wall is freely permeable. RER has ribosomes attached, while SER lacks them. Chloroplasts contain green chlorophyll, while chromoplasts have red, yellow or orange pigments.
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.