Explanation

Diatoms are microscopic algae and a major component of phytoplankton in aquatic ecosystems.

They play a key role in oxygen production and the marine food chain.

Explanation

Hydrolysis of one mole of ATP to ADP and inorganic phosphate releases approximately 7.3 Kcal of energy.

This energy is used to power various biological processes in cells.

Explanation

Nickel is a micronutrient essential for the activity of the enzyme urease, involved in nitrogen metabolism.

It helps in converting urea into usable forms of nitrogen for plants.

Explanation

The number of bones in a human skull is 22

The human skull is generally considered to consist of twenty-two bones

• eight cranial bones
• fourteen facial skeleton bones

**

while

300 bones are there in a newborn infant.

The human hand has 27 bones

Explanation

Oxygen is the most abundant bio-element in living organisms.

It mainly due to its presence in water and organic molecules.

It makes up about 65% of the human body by mass.

Explanation

Tertiary consumers are at the top of the food chain and feed on secondary consumers.

Lion, tiger, and hawk are carnivores that eat other carnivores or herbivores.

Explanation

Monosaccharides are the simplest form of carbohydrates.

They are called simple sugars because they cannot be broken down into smaller sugar units.

Explanation

Vitamin D helps the body absorb calcium from the intestines.

It regulates blood calcium levels by enhancing calcium absorption and reducing calcium loss from bones.

Explanation

Fats are lipids, not carbohydrates; they are made of fatty acids and glycerol.

Ribose, Starch, and Glucose are all carbohydrates composed of carbon, hydrogen, and oxygen.

Explanation

Activation energy is the minimum energy needed to start a chemical reaction by breaking bonds in reactants.

It determines reaction rates (lower = faster).