Explanation

Irritation or stimulation triggers a response in organisms.

It leading to movement as they react to the changes in their environment.

Explanation

• The mismatched pair is: Proteases → Carbohydrate
• Proteases are enzymes that break down proteins, not carbohydrates.

Explanation

• Group IIIA (or group 13) elements, such as boron (B), aluminum (Al), and gallium (Ga), lose three electrons to form ions with a charge of +3.
• This means that they typically form compounds by losing three electrons, resulting in a valency of +3.

Explanation

Mass number (237) = Number of protons (92) + Number of neutrons

Number of neutrons = Mass number - Number of protons

= 237 - 92

= 145

Therefore, the isotope 92U^237 has 145 neutrons.

Explanation

The bond formed between water molecules (H2O) is a hydrogen bond.

The bond within the water molecule itself is a covalent bond

Explanation

• Red meat is a good source of protein and other nutrients.
• It is not a significant source of calcium.

Explanation

When water cools from 4°C to 0°C, ice crystals begin to form 

When water freezes, the water molecules form a lattice that increases the volume.

As a result, the density decreases

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ND22-1-2023

Explanation

Refraction is the change in the direction of light when it passes from one medium to another.

It is one of the most commonly observed natural phenomena of light.

Optical prisms and lenses involve refraction to redirect light, and so does the eyes of living beings.

Explanation

The highest percentage of fat in a fish is present in the brain.

Fish brains contain a high concentration of lipids.

They are essential for their neurological functions.

Explanation

In a constructive reaction, also known as a synthesis reaction, large molecules are formed from smaller ones.

This type of reaction involves the combination of two or more molecules to form a larger molecule, often with the release of energy.