The primary muscle of breathing is the: MCQ with Answer and Explanation

Explanation:
Tetanus (lockjaw) is caused by the neurotoxin of Clostridium tetani, a soil bacterium that enters through wounds. The toxin causes muscle spasms and rigidity. Diphtheria is by Corynebacterium diphtheriae, pertussis by Bordetella pertussis, botulism by Clostridium botulinum (also a neurotoxin, but from food poisoning). Vaccination with DPT/tetanus toxoid prevents tetanus.

Explanation:
Phyllotaxy is the pattern of leaf arrangement on the stem. In sunflower (and many other plants like mustard), the phyllotaxy is alternate, meaning a single leaf arises at each node. In opposite phyllotaxy (e.g., guava), two leaves arise at a node, and in whorled (e.g., Nerium), more than two leaves arise at a node.

Explanation:
Cortisol, from the adrenal cortex, is a glucocorticoid that increases blood glucose, suppresses inflammation, and aids the body's adaptation to prolonged stress. Adrenaline is for acute stress, thyroxine metabolism, insulin glucose.