Explanation

• InIntrinsic factor is secreted by parietal cells of the stomach lining.
• It is essential for the absorption of Vitamin B12 in the small intestine.
• Without intrinsic factor, Vitamin B12 deficiency can occur.
• This may lead to pernicious anemia.
• It is produced in the gastric glands of the stomach.

Last verified on 10-06-2026

Explanation

• White blood cells (WBCs) are responsible for the body’s immunity and defense system.
• They protect the body from bacteria, viruses, and infections.
• They identify and destroy harmful pathogens.
• They are also called leukocytes.

Last verified 10-06-2026

Explanation

• Ornithology is the branch of zoology that deals with the study of birds.
• It includes bird behavior, classification, and migration patterns.
• Scientists who study birds are called ornithologists.

Last verified on 10-06-2026

Explanation

• Nuts and seeds are rich sources of Vitamin E.
• Vitamin E acts as a strong antioxidant in the body.
• It helps protect cells from damage and aging effects.
• Common sources include almonds, sunflower seeds, and walnuts.
• It supports skin health and immune system.

Last verified on 09-06-2026

Explanation

• The human body contains about 65% oxygen by mass.
• Oxygen is the most abundant element in the human body.
• It is mainly present in water (H₂O) and organic compounds.
• It is essential for respiration and energy production.

Additional information:

• Carbon: ~18%
• Hydrogen: ~10%
• Nitrogen: ~3%
• Other elements: ~4% (calcium, phosphorus, etc.)

Last verified 09-06-2026

Explanation

• The causative organism of malaria (Plasmodium) was discovered by Charles Louis Alphonse Laveran in 1880.
• He identified the parasite in the blood of infected patients.
• This discovery proved that malaria is caused by a protozoan parasite.

Additional information:

• Ronald Ross discovered that malaria spreads through female Anopheles mosquito (1897).

Last verified on 09-06-2026

Explanation

• Acromegaly is caused by excess secretion of Growth Hormone (GH).
• This hormone is released from the anterior pituitary gland.
• It usually occurs due to a pituitary tumor (adenoma).
• It leads to abnormal growth of hands, feet, and facial bones in adults.
• It develops after puberty when bone growth plates are already closed.

Last verified on 09-06-2026

Explanation

• Leucocytes (WBCs) increase in number when the body is fighting an infection.
• This condition is called Leukocytosis.
• It usually occurs due to bacterial or viral infections.
• WBCs help the body in defense against disease-causing germs.
• It is a sign that the immune system is actively responding to illness.

Last verified on 09-06-2026

Explanation

• The Tundra is a cold, treeless region found in high latitudes (Arctic) or high mountains.
• It has very low temperatures and a short growing season.
• Soil remains frozen for most of the year (permafrost).
• Common vegetation includes mosses, lichens, and small shrubs.
• It is found in regions like Arctic Canada, Siberia, and Alaska.

Last verified on 09-06-2026

Explanation

• Herpetology is the branch of zoology that studies reptiles and amphibians.
• Reptiles include: snakes, lizards, crocodiles, turtles.
• Amphibians include: frogs, toads, salamanders.
• The word comes from Greek “herpeton” meaning creeping animal.

Last verified on 09-06-2026