The process by which a cell engulfs a solid particle is termed: MCQ with Answer and Explanation

Explanation:
Alveoli are tiny air sacs surrounded by capillaries where gas exchange (O₂ and CO₂) occurs. Nephrons are kidney units, neurons nerve cells, villi intestinal projections. The lungs contain millions of alveoli to maximize surface area.

Explanation:
Dairy farming is the agricultural practice of breeding and raising livestock (like cows, buffaloes, goats) specifically for the long-term production of milk and milk products. Poultry farming involves the commercial rearing of domesticated birds (like chickens, ducks, turkeys) for the production of meat (broilers) and eggs (layers). Apiculture is the scientific rearing and management of honeybees (Apis species) for the production of honey, beeswax, and other hive products; silk production is sericulture. Thus, statements 1 and 2 are correct.

Explanation:
Zinc is a micronutrient that acts as a cofactor for tryptophan synthetase, an enzyme involved in the biosynthesis of the auxin indole-3-acetic acid (IAA) from tryptophan. Zinc deficiency causes stunted growth and 'little leaf' disease. Iron is for chlorophyll synthesis, copper for enzymes, manganese for photosystem II.