Explanation

Steroids are lipids that do not contain fatty acids.

They have a structure composed of four fused carbon rings (steroid nucleus) and are involved in various biological functions, such as hormones (e.g., cholesterol, testosterone, and estrogen).

Other lipids like neutral lipids, phosphatidic acids, and waxes do contain fatty acids in their structures.

Explanation

Obstruction of the circumflex artery leads to a Posterior wall myocardial infarction (MI).

The circumflex artery supplies the lateral and posterior parts of the left ventricle, so its blockage affects the posterior wall of the heart.

Explanation

1 calorie = 4.2 joules (exact value is 4.184 J), so 1000 cal = 4184 J.

1 kilocalorie (kcal) = 4184 joules, commonly used in food energy.

Explanation

The Hindbrain is divided into three main parts:

• Medulla Oblongata (controls breathing, heart rate, and blood pressure)
• Pons (involved in controlling sleep and arousal)
• Cerebellum (coordinates movement, balance, and learning)

Explanation

• The alimentary canal, also known as the gastrointestinal (GI) tract, is a continuous tube that extends from the mouth to the anus.
• It includes all the organs of the digestive system.

Explanation

• Small Vacuole because plant cells typically have a large central vacuole, not small vacuoles.

The components of a plant cell:

• Cell wall
• Cell membrane
• Cytoplasm
• Large vacuole
• Nucleus
• Chromosomes
• Chloroplast

Explanation

• Diffusion is the random movement of particles from a region of higher concentration to a region of lower concentration, resulting in uniform distribution.
• In this case, the ink particles spread out and mix with the water particles, causing the color to disperse throughout the glass.

Explanation

• Cholera is a waterborne disease caused by the bacterium Vibrio cholerae, which is typically found in contaminated water sources.
• If a child has cholera, it indicates that they have ingested contaminated water.
• It addressing water pollution is crucial to prevent further spread of the disease.

Water pollution can cause:

• Waterborne diseases (cholera, typhoid, diarrhea)
• Death of aquatic life (fishes, animals, plants)
• Health problems (immune depression, reproductive failure, acute poisoning)

Explanation

• Hypogeal germination occurs in monocotyledonous seeds (Monocot Seed).
• Where the cotyledon remains underground and the plumule emerges above the soil surface.
• Examples of monocot seeds include maize, wheat, rice, and grasses.

Explanation

• Plants are multicellular, composed of many cells that work together to form roots, stems, leaves, and other structures.
• They have modified cell wall and nucleus.
• They have chlorophyll.
• Algae are unicellular with proper cell wall and nucleus.
• It contain chlorophyll.
• It causes diseases: Cutleria, Ulva and Volvox.