Food prepared in leaves is transported by phloem tissue. Sieve tubes carry dissolved food materials from leaves to roots, stems and storage organs, while companion cells help regulate loading and unloading of sugars during transportation.
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Nervous tissue enables us to sense heat or cold. Specialised nerve cells called neurons receive sensory information from receptors in the skin and transmit messages to the brain, which interprets the sensations and produces appropriate responses.
Blood clotting is caused by platelets present in blood. When injury occurs, platelets gather at the wound and help form a clot, preventing excessive blood loss and protecting the body from harmful microorganisms entering through cuts.
These actions are controlled by nervous tissue. Neurons quickly transmit signals to the brain and muscles, enabling rapid responses like withdrawing from heat. Nervous tissue also stores and processes information, helping memory and learning functions effectively.
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.