The transfer of pollen grains from the anther of one plant to the stigma of a genetically different plant is known as: MCQ with Answer and Explanation

Explanation:
The pyramid of energy shows the flow of energy at successive trophic levels. Energy decreases as it moves up (about 10% transfer), so the pyramid is always upright. Pyramids of number and biomass may be inverted in some ecosystems (e.g., parasitic food chains, pond ecosystem), but the energy pyramid never is, according to the second law of thermodynamics.

Explanation:
Viruses are non-living outside a host cell and must hijack a host's cellular machinery to replicate, making them obligate intracellular parasites. They contain either DNA or RNA, not both (except some rare cases). They lack cell walls and metabolic machinery. Their status as living or non-living is debated, but they are biologically active only inside a host.

Explanation:
Oxytocin is a peptide hormone produced by the paraventricular nucleus of the hypothalamus and released by the posterior pituitary. In females, it has two major roles: 1) During childbirth, it stimulates powerful contractions of the uterine smooth muscle, facilitating labor and delivery (this is a positive feedback loop). 2) During lactation, it stimulates the contraction of myoepithelial cells surrounding the alveoli in the mammary glands, causing the ejection (let-down) of milk into the ducts in response to suckling. It does not produce milk; prolactin does that.