The disease caused by the bacterium Corynebacterium diphtheriae is: MCQ with Answer and Explanation

Explanation:
The hypothalamus is a small region in the forebrain that maintains homeostasis by regulating body temperature, hunger, thirst, sleep, and emotions. It also controls pituitary gland secretions. The cerebellum coordinates movement, medulla controls respiration and heart rate, pons relays signals. Hypothalamus acts as the body's thermostat and the link between nervous and endocrine systems.

Explanation:
Adrenaline (epinephrine) from the adrenal medulla mediates the 'fight-or-flight' response, increasing heart rate, contractility, and blood pressure. Acetylcholine slows heart, insulin lowers glucose, melatonin induces sleep.

Explanation:
Double fertilization is a unique feature of angiosperms. One male gamete fuses with the egg cell to form the diploid zygote (syngamy), which develops into the embryo. The second male gamete fuses with the diploid secondary nucleus (polar nuclei) of the central cell to form the triploid Primary Endosperm Nucleus (PEN), which develops into the endosperm.