The organelle that contains catalase and peroxidase enzymes is the: MCQ with Answer and Explanation

Explanation:
The pineal gland, a small endocrine gland in the brain, secretes melatonin in response to darkness, regulating circadian rhythms and sleep patterns. The pituitary controls other glands, thyroid metabolism, thymus immune development.

Explanation:
All are correct: biodiversity has three levels; hotspots have high endemism and threat; Western Ghats is a recognized hotspot.

Explanation:
Iodine atoms are incorporated into thyroxine (T₄, 4 iodine atoms) and triiodothyronine (T₃, 3 iodine atoms) synthesized by thyroid follicular cells. Iodine deficiency leads to goiter and hypothyroidism. Iron is in hemoglobin, calcium in bones, phosphorus in ATP and bones.