Identify the INCORRECT statement about the human nervous system:
A. The medulla oblongata regulates heartbeat and respiration.
B. The hypothalamus controls reflex actions of the spinal cord.
C. The cerebellum maintains body balance.
D. The cerebrum controls voluntary actions.
Answer: Option B
Solution (By JKSSB Mock Tests)
The hypothalamus regulates body temperature, hunger, and thirst, and controls the pituitary. Reflex actions are primarily coordinated by the spinal cord, not the hypothalamus. Hence, D is incorrect.
Explanation:
Calcium ions (Ca2+) play a crucial role in the blood clotting (coagulation) cascade. They are required for the conversion of prothrombin to thrombin, and fibrinogen to fibrin. Without calcium, the clotting process cannot proceed, which is why calcium salts are often added to blood collection tubes to prevent clotting during tests.
Explanation:
Root hairs are unicellular extensions of epidermal cells found in the zone of maturation (differentiation) of the root, just behind the zone of elongation. They increase surface area for water and mineral absorption. The root cap protects the tip, the meristematic zone contains dividing cells, and the elongation zone causes root lengthening.
Explanation:
Solanum tuberosum is the scientific name of potato, a member of the Solanaceae family. Solanum melongena is brinjal (eggplant), Capsicum annuum is chili, and Lycopersicon esculentum is tomato. Potato is a tuber (modified stem) rich in starch, and is one of the world's major food crops.
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