The 'Hormone Leptin' is primarily secreted by adipose (fat) tissue and acts on the hypothalamus to: MCQ with Answer and Explanation

Question
The 'Hormone Leptin' is primarily secreted by adipose (fat) tissue and acts on the hypothalamus to:
A. Suppress appetite and increase energy expenditure
B. Increase fat storage
C. Stimulate appetite
D. Lower blood glucose levels
Answer: Option A
Solution (By JKExamLibrary)
Leptin is a peptide hormone produced primarily by adipocytes (fat cells). Its concentration in the blood is proportional to the amount of body fat. Leptin acts as a satiety signal, crossing the blood-brain barrier to act on receptors in the hypothalamus. It suppresses appetite (anorexigenic effect) and increases energy expenditure, thereby regulating long-term food intake and body weight. It is often called the 'satiety hormone' or 'fat hormone'.
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Question #1
The pigment that absorbs light in photosystem I is primarily:
A. Xanthophyll
B. P700
C. P680
D. Chlorophyll b
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Correct Answer: Option B

Explanation:
P700, a specialized chlorophyll a, is the reaction center of photosystem I, absorbing far-red light (700 nm). P680 is the reaction center of photosystem II. Chlorophyll b and xanthophyll are accessory pigments.
This question belongs to: Science Biology
Question #2
The biome characterized by permafrost and low biodiversity, dominated by mosses and lichens, is:
A. Temperate deciduous forest
B. Taiga
C. Tundra
D. Savanna
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Correct Answer: Option C

Explanation:
The tundra biome, found in Arctic and Antarctic regions, has permanently frozen subsoil (permafrost), extremely low temperatures, short growing seasons, and vegetation limited to mosses, lichens, grasses, and dwarf shrubs. Taiga is the boreal coniferous forest, savanna is tropical grassland, temperate deciduous forest has distinct seasons. Tundra is the coldest biome.
This question belongs to: Science Biology
Question #3
The instrument used to measure blood pressure is a:
A. Stethoscope
B. Thermometer
C. Sphygmomanometer
D. Electrocardiograph
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Correct Answer: Option C

Explanation:
A sphygmomanometer, often used with a stethoscope, measures arterial blood pressure (systolic/diastolic) in mmHg. A stethoscope listens to heart/lung sounds, thermometer measures temperature, ECG records heart electrical activity. Normal blood pressure is about 120/80 mmHg.
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