Rickets in children is characterized by: MCQ with Answer and Explanation

Explanation:
Fertilization in humans typically occurs in the fallopian tube (ampullary region), not the uterus; the zygote then travels to the uterus for implantation. The placenta is the vital organ providing oxygen and nutrients to the growing fetus and removing waste. Spermatogenesis, the production of sperm, occurs in the seminiferous tubules of the testes. Thus, statements 2 and 3 are correct.

Explanation:
Zymase is the enzyme complex in yeast that catalyzes alcoholic fermentation, converting pyruvate to ethanol and CO₂. Invertase hydrolyzes sucrose, lactase breaks lactose, maltase breaks maltose. Zymase activity is exploited in baking and brewing industries.

Explanation:
The iris is the colored part of the eye containing smooth muscles (sphincter and dilator pupillae) that adjust the pupil diameter to control light entry. The cornea and lens focus, retina senses light.