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.

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