Explanation

Explanation

Eukaryotic cells have a well-defined nucleus enclosed by a nuclear membrane.

Prokaryotic cells lack a nucleus — their DNA floats freely in the cytoplasm.

This is the main difference between the two.

Explanation

Explanation

Benefits of GMOs:

Higher Crop Yields: Engineered for drought/pest resistance (e.g., Bt cotton).

Disease Resistance: Vaccines/biotech crops (e.g., virus-resistant papaya).

Nutritional Enhancement: Golden Rice (vitamin A enriched).

Explanation

Momentum is the product of an object’s mass and its velocity → Momentum = Mass × Velocity.

It is a vector quantity.

It is conserved in closed systems during collisions.

Explanation

Water is crucial for vital biological processes like digestion, circulation, and temperature regulation.

It also acts as a solvent, transporting nutrients and waste in living organisms.

Explanation

Fertilization in frogs involves the fusion of male and female gametes — a clear example of sexual reproduction.

The budding, fission, vegetative propagation are all forms of asexual reproduction.

Explanation

Liquids have smaller intermolecular spaces compared to gases, allowing particles to be more tightly packed.

This closeness results in a higher density in liquids than in gases.

Explanation

In a solid metal conductor, electric current is due to the flow of free electrons.

Electrons are negatively charged particles that move through the metal to create current.

Explanation

When calcium carbonate (CaCO₃) reacts with dilute hydrochloric acid (HCl), it produces carbon dioxide (CO₂) gas.

The reaction is:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O