Explanation

• The pharynx passes air into the larynx.
• It is the voice box.
• It is part of the respiratory system.
• The glottis is the opening between the vocal folds that allows air to pass through the larynx.
• The larynx directs air into the trachea, which carries it toward the bronchi and lungs.
• Air pathway: Pharynx → Larynx → Trachea → Bronchi → Lungs.

Last verified on 25-10-2026

Explanation

• Peripheral proteins are located on the inner or outer surface of the cell membrane.
• They are not embedded deeply in the lipid bilayer.
• They perform important functions, including cell signalling, enzymatic activity, and supporting the cell membrane.

Additional information:

• Integral proteins, in contrast, are embedded within the lipid bilayer and may extend across the entire membrane.
• Plasmodesmata are microscopic channels connecting adjacent plant cells, allowing substances and signals to pass between them.

Last verified on 25-10-2026

Explanation

• A, D, E, and K are fat-soluble vitamins.
• Fat-soluble vitamins are absorbed by the body along with dietary fats.
• They are present in foods that contain fats.
• The body stores these vitamins in the liver and fat tissue when they are not in use. 
• Megadoses of fat-soluble vitamins can be toxic.

Last verified on 25-10-2026

Explanation

• Polio can be effectively prevented through vaccines: Oral Polio Vaccine (OPV) and Inactivated Polio Vaccine (IPV).
• There is no cure or medication for polio, only prevention through immunization.

Last verified on 23-10-2026

Explanation

• Most skull bones are connected by fixed joints, also called suture joints.
• These are fibrous, immovable joints that hold the skull bones firmly together and protect the brain.
• The lower jaw is an exception because it forms a movable joint with the skull.

Last verified on 23-10-2026

Explanation

• The ozone layer protects the Earth from the sun.
• It is a part of the atmosphere that absorbs most of the harmful ultraviolet light from the sun.
• It sits in the stratosphere.
• It is about 9 to 18 miles above the Earth.
• It stops dangerous UV rays from hurting living things.

Last updated by NS on 14-8-2026

Explanation

• Excretion is the biological process by which waste products are removed from the body.
• The kidneys remove urea, excess water, and salts through urine.
• The lungs remove carbon dioxide and some water vapour during exhalation.
• The skin eliminates small amounts of water and salts through sweat.
• Excretion helps maintain the body's internal balance, known as homeostasis.

Last verified on 22-10-2026

Explanation

• Carbohydrates are the fastest and main source of energy.
• They are quickly converted into glucose in the body.
• Glucose is used immediately for energy production.
• They provide instant fuel for brain and muscles.

Last verified on 14-05-2026

Explanation

• Guava is rich in vitamin C, which improves the absorption of non-haem iron found in cereals, pulses, and other plant foods.
• Tea contains polyphenols that can reduce iron absorption when consumed with meals.
• Postponing tea until about 1–2 hours after the meal can help reduce its inhibitory effect on iron absorption.
• Combining vitamin C-rich foods, such as guava, citrus fruits, or tomatoes, with plant-based meals is a practical way to improve iron availability.

Last verified on 21-10-2026

Explanation

• Hepatitis A vaccination provides effective protection against the Hepatitis A virus.
• Hepatitis A mainly spreads through contaminated food or water and the fecal–oral route.
• Washing hands thoroughly with soap and clean water, especially after using the toilet and before preparing or eating food, helps prevent infection.
• Drinking safe water and eating properly prepared food further reduce the risk of transmission.

Last verified on 21-10-2026