The hind-brain consists of the cerebellum, pons and medulla oblongata. Among these, the medulla oblongata controls vital involuntary actions such as blood pressure, heartbeat, breathing, salivation and other reflex activities essential for survival. sample paper for class 10 science board exam ...
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Excessive use of chemicals and pesticides pollutes soil, air, and water, kills beneficial organisms, reduces soil fertility, contaminates crops and enters the food chain, ultimately harming biodiversity, human health and causing long-term environmental degradation. class 10 science half yearly paper download class ...
Plugging a leak in a blood vessel is essential to prevent entry of pathogens and maintain blood circulation. The blood component responsible is platelets, which stick to the damaged site, release clotting factors and form a temporary plug, eventually leading ...
The phloem in plants transports food, mainly sucrose, from the leaves where it is produced to all other parts of the plant, including roots, stems and fruits, supplying energy and materials necessary for growth, storage and development. Download cbse sample paper ...
The transport system in plants is slower than in animals because plants lack a pumping heart; movement of water, minerals and food occurs mainly through osmosis, diffusion and transpiration pull, which are slower processes compared to the rapid blood circulation ...