In the human brain, the 'limbic system' is primarily associated with: MCQ with Answer and Explanation

In the human brain, the 'limbic system' is primarily associated with:
A. Regulation of emotions, memory, and motivation
B. Processing of visual and auditory information
C. Regulation of heart rate and breathing
D. Coordination of voluntary motor movements
Answer: Option A
Solution (By JKSSB Mock Tests)
The limbic system is a complex set of structures in the medial temporal lobe, including the hippocampus, amygdala, and hypothalamus. It is often called the 'emotional brain' and is primarily responsible for processing emotions (fear, anger, pleasure), forming and retrieving memories, and regulating motivation and homeostatic drives (hunger, thirst). The medulla regulates heart rate, the cerebellum coordinates movement, and the occipital/temporal lobes process sensory information.

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Fungi primarily reproduce asexually by the formation of:
A. Buds only
B. Seeds
C. Gems
D. Spores

Correct Answer: Option D


Explanation:
Fungi reproduce asexually primarily through the formation of spores, which are produced in large numbers in specialized structures like sporangia (in Rhizopus) or conidiophores (in Aspergillus). These spores are highly resistant and can be dispersed by wind, water, or animals. Some fungi, like yeast, also reproduce asexually by budding.

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The pigment that gives brown algae their color is:
A. Phycocyanin
B. Phycoerythrin
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D. Fucoxanthin

Correct Answer: Option D


Explanation:
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In plant physiology, the 'Osmotic pressure' is the pressure that must be applied to a solution to prevent the inward flow of water across a semipermeable membrane. It is directly proportional to the:
A. Temperature only
B. Concentration of solute particles
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Correct Answer: Option B


Explanation:
Osmotic pressure (OP) is a colligative property of a solution, meaning it depends on the number of solute particles dissolved in a given volume of solvent, not on the nature or size of the particles. It is defined as the hydrostatic pressure that must be applied to a solution to prevent the net flow of water (osmosis) into the solution across a semipermeable membrane. According to the van't Hoff equation, osmotic pressure is directly proportional to the molar concentration of solute particles and the absolute temperature. The more concentrated the solution, the higher its osmotic pressure.

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