Explanation

Sharp knives have a smaller contact area, so the same force creates greater pressure.

Higher pressure allows the knife to cut through materials more easily.

Explanation

The ovary is the female reproductive part of a flower that holds and protects ovules (which develop into seeds after fertilization).

It is part of the pistil (gynoecium) and matures into a fruit after pollination.

Explanation

An allele that masks the expression of another allele is called a dominant allele.

The masked allele is known as the recessive allele in such a relationship.

Explanation

Sulphur powder is commonly found as a bright yellow solid.

It is non-metallic.

It is used in medicines, fertilizers, and chemicals.

Explanation

In this reaction, two reactants (CaO and CO₂) combine to form a single product (CaCO₃).

This is the definition of a combination (or synthesis) reaction.

Explanation

Carbon dioxide (CO₂) is a major greenhouse gas that helps trap heat in the Earth’s atmosphere.

It plays a key role in maintaining Earth’s temperature but excess CO₂ leads to global warming.

Explanation

In cellular respiration, glucose (food) is broken down in cells (via mitochondria) to produce ATP (energy), CO₂, and water.

Chemical equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (ATP)

Explanation

Definition of Equator:

The equator is an imaginary 0° latitude line, encircling Earth’s midpoint.

It divides the planet into the Northern and Southern Hemispheres.

Explanation

Let's calculate the number of protons, neutrons, and electrons for both atoms:

³¹₁₅P (Phosphorus)

•     Protons: 15
•     Neutrons: 31 - 15 = 16
•     Electrons (neutral atom): 15

³²₁₆S (Sulfur)

•     Protons: 16
•     Neutrons: 32 - 16 = 16
•     Electrons (neutral atom): 16

Both atoms have the same number of neutrons (16).

Explanation

Cyanobacteria are photosynthetic bacteria that contain chlorophyll and appear bluish-green in color.

They are called blue-green algae, but they are prokaryotic and not true algae (which are eukaryotic).