All Free Biology MCQs with Answers

1321. Which pollutant may lead to 'Black foot disease' ?

• A. Cd
• B. As
• C. Hg
• D. Cu

Explanation: Blackfoot disease is a severe form of arsenic poisoning associated with long-term consumption of arsenic-contaminated water. Students may choose mercury because it is also a toxic heavy-metal pollutant, but arsenic is specifically linked with Blackfoot disease.

1322. Oncogene is responsible for:_________?

• A. Cancer
• B. Malaria
• C. Typhoid
• D. Lung Disease

Explanation: An oncogene is a gene that can promote uncontrolled cell division when activated or abnormally expressed, contributing to cancer development. Students may choose lung disease because smoking-related lung cancer involves oncogenes, but oncogenes are linked to cancer generally, not to lung disease alone.

1323. MDT is used for disease :_________?

• A. Tuberculosis
• B. Polio
• C. Leprosy
• D. None of these

Explanation: MDT, or multidrug therapy, uses several antibiotics together to treat leprosy and reduce the chance of drug resistance. Students may choose tuberculosis because it can also require multiple drugs, but MDT is the standard term used for the combination treatment of leprosy.

1324. Leprosy bacillus was invented by :__________?

• A. Koch
• B. Harvey
• C. Hansen
• D. Fleming

Explanation: Gerhard Armauer Hansen identified the bacterium responsible for leprosy, now called Mycobacterium leprae, so it is known as Hansen's bacillus. Students may choose Koch because he discovered several disease-causing bacteria, but Koch did not identify the leprosy bacillus.

1325. Which fungus is known as 'Green Mold' ?

• A. Aspergillus
• B. Penicillium
• C. Mucus
• D. None of the above

Explanation: Penicillium forms blue-green or green mould on foods and was the fungus from which penicillin was first obtained. Students may choose Aspergillus because it is also a common mould, but Aspergillus is usually described as black, yellow or other coloured mould rather than the classic green mould.

1326. The part the body may be repaired, replaced or removed _____________?

• A. Pharmacology
• B. Medicine
• C. Physiology
• D. Surgery

Explanation: Surgery is the branch of health care concerned with repairing, replacing, removing or otherwise treating body parts through operative procedures. Students may choose medicine because it is the broader field of treating disease, but surgery is the specific discipline involving physical intervention on body structures.

1327. Major Biological Issues of today________?

• A. Human population growth
• B. Infectious diseases
• C. Addictive drugs
• D. Pollution
• E. All of these

Explanation: Human population growth, infectious diseases, addictive drugs and pollution are all major biological and public-health issues because each affects human survival, health or the environment. Students may select pollution alone because it is a widely discussed issue, but the inclusion of “all of these” makes option e the complete answer.

1328. Who introduced Homeopathy in 1796?

• A. Samuel Hahnemann
• B. Franz Anton Mesmer
• C. Edward Jenner
• D. Hakim Ajmal Khan

Explanation: Samuel Hahnemann introduced homeopathy in 1796 as a system based on the idea that substances causing symptoms in healthy people could treat similar symptoms. Edward Jenner is the likely distractor because he introduced vaccination, which is a different medical development.

1329. 'Mastectomy' is mainly associated with which of these diseases?

• A. AIDS
• B. Breast Cancer
• C. Tuberculosis
• D. Blood Cancer

Explanation: A mastectomy is the surgical removal of all or part of a breast and is mainly performed as a treatment for breast cancer. Students may choose blood cancer because both are serious cancers, but mastectomy is specific to breast tissue and therefore is not a treatment for blood cancer.

1330. Apiculture means:____________?

• A. Chicken farming
• B. Horse forming
• C. Silkworm farming
• D. Honey bee farming

Explanation: Apiculture is the managed rearing and keeping of honey bees, mainly for honey, beeswax and other products. Students may choose silkworm farming because it is another insect-based activity, but silkworm farming is called sericulture, not apiculture.