Explanation

Deserts are formed by weathering processes as large variations in temperature between day and night put strains on the rocks, which consequently break in pieces.

Although rain seldom occurs in deserts, there are occasional downpours that can result in flash floods.

Explanation

Due to biomagnification, DDT (Dichlorodiphenyltrichloroethane) accumulates more in organisms higher up the food chain. 

Seagulls, being top predators, experience the highest deposition of DDT.

Explanation

• An ecosystem includes all the living components (biotic factors) like plants, animals, and microorganisms, and non-living components (abiotic factors).
• Like soil, water, air, and sunlight, interacting with each other.

Explanation

In normal blood plasma, glucose is present at about 0.1% concentration, which is approximately 100 mg/dL.

This level is vital for supplying energy to body cells, especially the brain.

Explanation

Explanation

Plants have two main systems: the root system and the shoot system.

The root system anchors the plant and absorbs water.

The shoot system includes stems, leaves, and flowers for photosynthesis and reproduction.

Explanation

Rough Endoplasmic Reticulum (RER) appears granular due to the presence of ribosomes attached to its surface.

These ribosomes are responsible for protein synthesis within the cell.

Explanation

Smoking increases the risk of blood clots forming in arteries supplying the heart and brain.

These clots can lead to life-threatening conditions like heart attacks and strokes.

Explanation

Guava is a flowering plant because it produces flowers that later develop into fruits.

Ferns, Thuja, and Sago palms are examples of non-flowering plants.

Explanation

The peripheral nervous system (PNS) includes 12 pairs of cranial nerves that originate from the brain.

These nerves primarily control functions of the head, neck, and some internal organs like the heart and lungs.