Explanation

• The main purpose of pre-natal ultrasound is to monitor the growth and health of the fetus during pregnancy.
• It helps doctors check the baby’s position, heartbeat, and development.
• It can detect abnormalities or complications early.

Last verified on 23-06-2026

Explanation

• On average, the human body contains about 60–70% water.
• Adult males: 60–65%
• Adult females: 50–60%
• Infants: ~75%
• Main functions: transport, digestion, temperature regulation

Last verified on 23-06-2026

Explanation

• Hydrophytes have poorly developed roots.
• Because they live in water and can absorb water directly from their surroundings.

Additional information:

Key Characteristics of Hydrophytes:

• Reduced xylem tissue
• Large air spaces in tissues (aerenchyma)
• Thin or absent cuticle
• Flexible stems and leaves

Examples include water lily and Hydrilla.

Last verified on 23-06-2026

Explanation

• Damage to alveoli due to smoking leads to reduced gas exchange efficiency in the lungs.
• Alveoli are tiny air sacs where oxygen enters blood and carbon dioxide is removed.
• Smoking destroys alveolar walls, reducing surface area for gas exchange.
• This causes breathing problems and diseases like emphysema and COPD.

Last verified on 22-06-2026

Explanation

• Vascular tissue is present in both angiosperms and gymnosperms.
• It includes xylem and phloem.
• It helps in transport of water and food.
• Both plant groups are vascular plants.
• It is absent in non-vascular plants like mosses.

Last verified on 18-06-2026

Explanation

• Endoplasmic Reticulum (ER) and Golgi apparatus transport proteins.
• Rough ER helps in protein synthesis and initial transport.
• Golgi apparatus modifies, packages, and sends proteins.

Last verified on 18-06-2026

Explanation

• Mitochondria and chloroplasts contain their own DNA besides nucleus.
• They can reproduce independently to some extent.
• Mitochondrial DNA is inherited from the mother.
• Chloroplast DNA is found in plant cells.
• Both are semi-autonomous organelles.

Last verified on 18-06-2026

Explanation

• Chromosomes are made of DNA and proteins.
• DNA carries genetic information.
• Proteins (mainly histones) help package DNA.
• Together they form chromatin material.
• Chromosomes are found in the nucleus of cells.

Last verified on 18-06-2026

Explanation

• The retina is the light-sensitive layer located at the back of the human eye.
• It contains special cells called rods and cones that detect light and color.
• These cells convert light into electrical signals.
• The signals are then sent to the brain through the optic nerve to produce vision.

Last verified on 11-03-2026

Explanation

• A bicycle stays stable in motion due to the gyroscopic effect of rotating wheels, which resists tilting.
• When the wheels spin, they create angular momentum that keeps the bicycle balanced.
• At rest, there is no rotation, so no gyroscopic stability is produced.

Last verified on 14-06-2026