Explanation

Charles Elton defined a species' niche as its occupation — the role it plays in its environment.

It includes how the species obtains food, interacts with other organisms, and its place in the ecosystem structure.

Explanation

Explanation

• In maize (Zea mays), the first structure to emerge from the seed during germination is the radical root.
• It is also known as the primary root.
• This root grows downward into the soil, anchoring the seedling and absorbing water and nutrients.

Explanation

Heparin is generally considered safe during pregnancy.

It is the anticoagulant (blood thinner) of choice for many pregnant women

Warfarin is contraindicated in pregnancy due to its potential teratogenic effects,

While aspirin and clopidogrel may be used in certain situations but require careful monitoring.

Explanation

The smallest bone in the human body, the stapes, is located in the ear.

It is part of the middle ear and helps transmit sound vibrations.

The largest bone is the femur, or thigh bone, which supports the weight of the body.

Explanation

This statement is NOT true.

Plasmids replicate independently and are not necessary for the replication of the bacterial chromosome.

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)