Explanation

This phenomenon is called persistence of sound or auditory memory.

The human ear retains the sensation of a sound for about 0.1 second (1/10) after the sound stops.

Explanation

When a grain of sand enters an oyster's body, the oyster secretes layers of nacre (mother of pearl) around the irritant.

Over time, these layers build up and form a pearl.

Explanation

Plasma proteins (like albumin, globulin, and fibrinogen) make up 7–8% of plasma by weight.

These proteins help in maintaining osmotic pressure, immunity, and blood clotting.

Explanation

Oil and petrol form a thin layer on the water surface, blocking sunlight from reaching underwater plants.

This layer also restricts the mixing of oxygen from the air into the water, harming aquatic life.

Explanation

The term complementarity refers to the specific pairing of nitrogenous bases in DNA: Adenine pairs with Thymine, and Cytosine pairs with Guanine.

This rule ensures accurate DNA replication and structure.

Explanation

In a food chain, herbivores are primary consumers, feeding on producers (plants), which places them at the second trophic level.

The first level is occupied by plants (producers), and herbivores come next.

Explanation

Children under 5 are most vulnerable to waterborne diseases due to their developing immune systems and high susceptibility to dehydration.

Poor sanitation and contaminated water sources can severely impact young children, leading to high mortality rates in this age group.

Explanation

During interphase, the cell grows, replicates its DNA, and prepares for cell division.

This phase is crucial for the cell to accumulate the necessary resources and genetic material for the subsequent mitotic division.

Interphase consists of three stages:

1. G1 (Gap 1): Cell growth and preparation

2. S (Synthesis): DNA replication

3. G2 (Gap 2): Final preparation for cell division

These stages ensure the cell is ready for successful division.

Explanation

Tuberculosis (TB) is primarily treated with a combination of antibiotics, which is a form of chemotherapy.

The treatment usually involves a prolonged course of multiple antibiotics to eliminate the bacteria.

Explanation

Diphtheria is a bacterial infection caused by Corynebacterium diphtheriae.

It affects the respiratory system.

It can lead to serious complications if untreated.