The process that regulates body temperature by sweating and shivering is an example of:
A. Circadian rhythm
B. Negative feedback
C. Feedforward control
D. Positive feedback
Answer: Option B
Solution (By JKSSB Mock Tests)
Thermoregulation uses negative feedback mechanisms: when body temperature rises, sweating and vasodilation cool the body; when it falls, shivering and vasoconstriction generate and conserve heat. Negative feedback counteracts deviations from a set point. Positive feedback amplifies a change (e.g., labor contractions).
Explanation:
Lacrimal glands, located above the outer corner of each eye, produce tears that lubricate and protect the eye surface. Parotid and sublingual are salivary glands, ceruminous glands produce ear wax.
Explanation:
The Golgi apparatus consists of flat, disc-shaped cisternae and is primarily involved in the packaging, modification, and secretion of materials (proteins and lipids) synthesized in the ER. It has a cis face (forming face) near the ER and a trans face (maturing face) directed towards the plasma membrane.
Explanation:
Bacteria lack a true nucleus; their circular chromosome is concentrated in a region called the nucleoid. Plasmids are extra-chromosomal DNA but the main genome is in the nucleoid. Eukaryotes have a membrane-bound nucleus.
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