All Free Biology MCQs with Answers

1331. Who is commonly known as "the Father of Microbiology"?

• A. Charles Darwin
• B. Robert Hook
• C. Antonie van Leeuwenhoek
• D. None of these

Explanation: Antonie van Leeuwenhoek is commonly called the Father of Microbiology because his microscopes allowed him to observe and describe bacteria and other microscopic organisms. Students may choose Robert Hooke because he also made important microscopic observations, but Hooke mainly described cells in cork rather than founding microbiology through observations of microorganisms.

1332. Which one of the following toxic metals is extensively present in newspaper?

• A. Mg
• B. Cd
• C. Pb
• D. Hg

Explanation: Lead, symbol Pb, was historically used in printing inks and could therefore be present in newspapers. Students may choose mercury because it is a well-known toxic metal, but mercury was not the characteristic metal associated with newspaper printing ink.

1333. Cats mostly show which type of Diabetes Mellitus?

• A. Type 1 diabetes
• B. Type 2 diabetes
• C. Both A. & B
• D. None of these

Explanation: Most diabetic cats develop a type 2-like diabetes associated with insulin resistance and reduced insulin secretion, often linked with obesity. Students may choose type 1 because diabetes involves inadequate insulin, but the usual feline pattern is not primarily autoimmune type 1 disease.

1334. Dogs mostly show which type of Diabetes Mellitus:

• A. Type 1 diabetes
• B. Type 2 diabetes
• C. Both a& b
• D. None of these

Explanation: Canine diabetes most commonly resembles type 1 diabetes, with destruction or loss of pancreatic beta-cell function causing marked insulin deficiency. Students may choose type 2 because dogs can also show insulin resistance, but that is not the predominant classification in dogs.

1335. The method of reproduction of new plants by cells instead of seed is known is:___________?

• A. Tissue culture
• B. Mutation
• C. Antibiosis
• D. Recombination

Explanation: Tissue culture produces new plants from small pieces of tissue or cells under sterile conditions, without using seeds. Mutation changes genetic material, while recombination reshuffles genetic material; students may choose mutation because tissue-cultured plants can sometimes show variation.

1336. BOD refers to the __________?

• A. Bidding of Dermatology
• B. Binding of Dirt
• C. Biochemical occupied Date
• D. Biochemical Oxygen demand

Explanation: BOD means biochemical oxygen demand, the amount of dissolved oxygen microorganisms require to decompose organic matter in water. Students may choose c because it begins with “biochemical,” but “occupied Date” is not a scientific term and does not describe oxygen consumption.

1337. Mild tertian malaria is caused by _______ ?

• A. Plasmodium vivax
• B. Plasmodium falciparum
• C. Plasmodium ovale
• D. Plasmodium malariae

Explanation: Plasmodium vivax causes benign or mild tertian malaria, with fever commonly recurring every 48 hours because the parasite synchronously ruptures red blood cells. Students may choose P. falciparum because it causes the most severe malaria, but falciparum malaria is classically malignant tertian rather than mild tertian.

1338. Which of the following " Tikka disease" is related with the crop?

• A. Musturd
• B. Paddy
• C. Ground nut
• D. None of these

Explanation: Tikka disease is a fungal disease of groundnut, also called peanut leaf spot, caused mainly by Cercospora species. Students may choose paddy because it has several important fungal diseases, but tikka disease specifically refers to groundnut.

1339. Many bacteria in our digestive system synthesize vitamins for example vitamin_________?

• A. B1
• B. B2
• C. B12
• D. B6

Explanation: Intestinal bacteria can synthesize several B-group vitamins, including vitamin B12, which is also important for red blood cell formation and nervous-system function. Students may choose B1 because gut bacteria can produce some thiamine, but B12 is the standard example asked in this context.

1340. It is very serious disease of brain which is caused by fungi________?

• A. ring worm
• B. meningitis
• C. hepatitis
• D. none of these

Explanation: Meningitis is inflammation of the meninges surrounding the brain and spinal cord, and although bacteria and viruses are common causes, fungi can also cause serious fungal meningitis. Ringworm is a fungal skin infection, so students may choose it merely because it is caused by fungi.