Consider statements about microorganisms: 1. Algae are photosynthetic. 2. Protozoa are multicellular. 3. Fungi reproduce by spores. Which are correct? MCQ with Answer and Explanation

Explanation:
The pineal gland, located in the brain, secretes melatonin, which regulates circadian rhythms and the sleep-wake cycle. Its secretion increases in darkness.

Explanation:
Louis Pasteur developed pasteurization (heating to kill spoilage organisms), vaccines for rabies and anthrax, and disproved spontaneous generation.

Explanation:
A reflex arc is the neural pathway that controls a reflex action. It typically involves: a receptor (detects stimulus), a sensory neuron (carries impulse to CNS), an interneuron (in the spinal cord), a motor neuron (carries impulse away from CNS), and an effector organ (muscle or gland that responds). The motor neuron is responsible for the final output.