Explanation

Skin cells form the outermost layer of the body, acting as a protective barrier.

They shield internal organs and tissues from injury, pathogens, and dehydration.

Explanation

Explanation

Zygote is formed in the ovary after the fusion of male and female gametes during fertilization.

The ovary then develops into a fruit, and the zygote grows into an embryo.

Explanation

Desertification means وہ عمل جس سے صحرائی زمین صصرا بن جائے

Desertification refers to the process of fertile land becoming desert due to factors like drought, deforestation, or improper agricultural practices.

It results in the loss of productivity and ecological balance in the affected areas.

Explanation

Sugarcane is a monocot plant with parallel leaf venation and fibrous roots.

Guava, Mango, and Rose are dicot plants with net-like venation and taproot systems.

Explanation

Air contains water vapour, smoke, dust particles, and ozone in varying amounts.

These components are naturally present in the atmosphere, contributing to various environmental and weather phenomena.

Explanation

3% of Earth's water is fresh water.

2.5% of that fresh water is unavailable because it is:

• Locked in glaciers and polar ice caps
• Present in the atmosphere and soil
• Too deep underground to extract affordably

Only 0.5% of Earth's water is available as usable fresh water for human use.

Explanation

Dendrites are branched fibers that receive nerve impulses and carry them toward the cell body.

They act like antennas, picking up signals from other neurons.

Explanation

Antibodies are specialized proteins produced by the immune system to identify and neutralize viruses and bacteria.

They specifically bind to foreign particles (antigens) to help destroy them.

Explanation

Alveoli are tiny air sacs in the lungs where oxygen enters the blood and carbon dioxide is removed.

Their thin walls and rich capillary network make gas exchange efficient.