The process of eliminating undigested food from the body is: MCQ with Answer and Explanation

Explanation:
Louis Pasteur, through his famous swan-neck flask experiment (1861), demonstrated that life does not arise spontaneously from non-living matter. Sterilized broth in flasks remained sterile unless exposed to airborne microorganisms. Fleming discovered penicillin, Koch established postulates for microbial disease, Jenner developed smallpox vaccine. Pasteur's work was foundational for microbiology.

Explanation:
Deforestation, the removal of trees and vegetation, exposes the topsoil to wind and water, leading to severe soil erosion and loss of fertility. Afforestation, the planting of trees in barren areas, increases biomass and helps in carbon sequestration, as trees absorb atmospheric CO2 during photosynthesis, mitigating global warming. Most plastics are synthetic polymers that are non-biodegradable, persisting in the environment for hundreds of years and causing pollution. Thus, statements 1 and 2 are correct.

Explanation:
Oleic acid is a monounsaturated fatty acid (one double bond), found in olive oil. Stearic acid is saturated, linoleic acid is polyunsaturated (two double bonds), linolenic acid is polyunsaturated (three double bonds). Unsaturated fats are generally liquid at room temperature and healthier for the heart. Oleic acid is an omega-9 fatty acid.