The term 'biological magnification' refers to: MCQ with Answer and Explanation

Explanation:
The aorta receives blood directly from the left ventricle under high pressure (systolic ~120 mmHg). Pressure decreases as blood moves through arteries, capillaries, and veins. Vena cava pressure is near zero.

Explanation:
Diatomaceous earth is a siliceous, sedimentary rock formed from the fossilized remains of diatoms. Diatoms have unique, highly resistant cell walls called frustules, made of hydrated silicon dioxide (silica). Over millions of years, these frustules accumulate on ocean and lake floors, forming diatomaceous earth, which has numerous industrial applications due to its abrasive and porous nature.

Explanation:
Kwashiorkor is a severe form of malnutrition in children caused by a significant deficiency of protein in the diet, despite potentially adequate calorie intake. It is characterized by edema (swelling, especially in the belly due to low albumin), an enlarged liver, thinning hair, and a 'flaky paint' skin rash. Marasmus is caused by overall protein-calorie deficiency.