Explanation

• Humans are born with around 300 bones, but as they grow and develop.
• Some of these bones fuse together, resulting in a total of 206 bones in the adult human skeleton.
• This process of bone fusion, called ossification.

Explanation

Calcium phosphate, specifically hydroxyapatite, is the main component of bones and teeth.

It is a calcium salt of phosphoric acid.

It is the primary mineral constituent of bone tissue, making up about 70-80% of bone dry weight.

Calcium phosphate gives bones and teeth their strength and rigidity.

Explanation

Rice is rich in carbohydrates but low in protein and other essential nutrients.

A diet of rice alone can lead to protein deficiency, causing conditions like kwashiorkor.

Explanation

Trypsin works best in a basic (alkaline) environment like the small intestine.

The stomach is highly acidic, which inhibits trypsin’s activity.

Explanation

Plants have a transport system (xylem and phloem) to move water, minerals, and food throughout the plant.

This system ensures that all parts get the nutrients and water needed for growth and survival.

Explanation

The insoluble parts of cytoplasm are mainly the organelles, which include structures like the nucleus, mitochondria, ER, etc.

Mitochondria is a type of organelle, so the broader correct term is organelles.

Explanation

Micro molecules (or small molecules) have low molecular weight, like glucose or amino acids.

Macromolecules are large molecules like proteins, carbohydrates, and nucleic acids.

Explanation

Photosynthesis requires carbon dioxide, water, and sunlight, not oxygen.

Respiration, rusting, and combustion all need oxygen to occur.

Explanation

Explanation

Fossil fuels (like coal, oil, and natural gas) are non-renewable because they take millions of years to form.

Once used, they cannot be replenished on a human timescale.