Explanation

Cellulose is the main structural component of the primary cell wall in green plants.

It provides rigidity and support to the growing plant cells.

Explanation

Sclerenchyma provides rigidity and strength, while Collenchyma offers flexible support in growing parts.

Both are considered mechanical tissues because they help maintain the structural integrity of plants.

Explanation

Carbohydrates are the primary source of energy for the body, broken down into glucose.

They fuel cellular activities, brain function, and physical movement.

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

• Lysosome is the cell organelle found in animal cells that helps in intracellular digestion.
• It contains digestive enzymes and acids that break down cellular waste and foreign substances.

Explanation

The process of taking air into the lungs is known as inspiration or inhalation, and the process of breathing it out is expiration or exhalation.

Air is inhaled through the mouth or the nose.

The sequence of air passage during inhalation is as follows:

Nostrils→pharynx→larynx→trachea→alveoli

Explanation

Biotic Components:

Living organisms (e.g., plants, animals, microbes).

Abiotic Components:

Non-living factors (e.g., sunlight, water, soil, temperature).

Explanation

Sori are clusters of sporangia found on the underside of fern leaves (sporophylls).

They are responsible for producing and releasing spores for reproduction.

Explanation

Lactic acid fermentation occurs in skeletal muscles during intense exercise when oxygen is scarce, converting pyruvate to lactate.

It provides rapid but temporary energy, causing muscle fatigue.

Explanation

Cells are the basic building blocks of all plants and animals.

It forming the fundamental structure and function of living organisms.