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The correct option is (iii). Meristematic cells have thin walls, dense cytoplasm and a large prominent nucleus. These features support rapid cell division, active metabolism and continuous growth, allowing plants to increase in length, girth and regeneration.
The correct option is (ii) hinge joint. Hinge joints allow movement mainly in one direction, like bending and straightening. Knees and ankles function similarly to door hinges, providing controlled movement and stability during walking, running and jumping.
If tissues beneath the bark are severely damaged, transport of food throughout the plant would be hampered. Phloem damage prevents movement of sugars from leaves to roots and storage tissues, affecting growth, repair and survival of the tree.
Plants grow after being cut because intercalary meristematic tissues remain active at nodes and internodes. These cells divide rapidly and produce new branches or shoots, helping grasses, hedges and other plants regenerate after cutting or grazing.
Life starts from a single cell called a zygote. It divides repeatedly through mitosis to form many cells. These cells differentiate into tissues organs and organ systems, eventually developing into a complete multicellular organism with specialised functions.
