Most important biology questions for NDA, CDS, AFCAT for exam preparation.

Dear, students as you know biology is an important part of competitive exams especially when you are preparing for NDA, CDS, AFCAT so here in DOON DEFENCE DREAMERS, we will provide you with some of the most important biology questions regarding practising for competitive examinations which will make your preparation a little easy and helps you improve.

1. Golden rice, a genetically-modified crop plant where the incorporated gene used for biosynthesis of

(a) Omega-3 fatty acids

(b) Vitamin A

(c) Vitamin B

(d) Vitamin C

Ans. (b) Vitamin A

2. Which one of the following statements is not correct about microbes?

(a) They are used in processes for sewage treatment plants.

(b) They are used for the production of beverages in industrial fermenters.

(c) the antibiotic has not been obtained from a microbe.

(d) They are used for the treatment of diseases to get many bioactive molecules.

Ans. (C) No antibiotic has been obtained from any microbe.

 

3. Melanin, a natural pigment provides colour to human hair, skin, iris and It provides protection against

(a) Ultraviolet radiation

(b) Infrared radiation

(c) X-ray radiation

(d) Short wave radio radiation

Ans. (A) Ultraviolet radiation

4. Muscles are connected with tendons and bones are tightly spaced bundles of which one of the following long fibrous protein?

(a) Fibrin

(b) Collagen

(c) Elastin

(d) Cellulose

Ans. (b) firbrin

5. In following Vitamins which one has a role in blood clotting?

(a) Vitamin A

(b) Vitamin D

(c) Vitamin E

(d) Vitamin K

Ans. (d) Vitamin K

6. The `Probiotic’ term is applied to

(a) Organic food

(b) Antacid

(c) Antibiotic

(d) Live microbial food supplement

Ans. (d) Live microbial food supplement

7. Which of the following microbes causes curding of milk?

(a) Lactic Acid Bacillus

(b) Clostridium botulinum

(c) Vibrio cholerae

(d) Saccharomyces cerevisiae

Ans. (a) Lactic Acid Bacillus

8. which one of the following’s intake of food components should be reduced by patients facing Gouty Arthritis due to elevated serum uric acid level?

(a) Food fibres

(b) Nucleic acids

(c) Lipids

(d) Carbohydrates

Ans. (b) Nucleic acids

9. Which one of the following is the scientific name of the causal organism of elephantiasis?

(a) Ascaris lumbricoides

(b) Culex pipiens

(c) Wuchereria bancrofti

(d) Fasciola hepatica

Ans. (c) Wuchereria bancrofti

10. Who among the following shared the Nobel Prize in 1962 along with Francis Crick and James Watson for their discoveries concerning the molecular structure of nucleic acids?

(a) Erwin Chargaff

(b) Maurice Hugh Frederick Wilkins

(c) Rosalind Franklin

(d) Phoebus Levene

Ans. (b) Maurice Hugh Frederick Wilkins

11. For which among the following is not a true fruit?

1. Apple
2. Date
3. Grape
4. Plum

Answer : D.  Plum

12. Which of the following is least infectious?

1. leprosy
2. hepatitis
3. tuberculosis
4. conjunctivitis

Answer : A. leprosy

13. Which of the following is not a mosquito-borne disease?

1. Dengue fever
2. Malaria
3. Sleeping sickness
4. Filariasis

Answer : C.  Sleeping sickness

14. In amino acids, apart from addition to carbon, hydrogen, nitrogen and oxygen which one of the following is found ?

1. Phosphorus
2. Zinc
3. Calcium
4. Sulphur

Answer : D.  Sulphur

15. in which of the following elements, which one is important for the impulses in the nerve fibre?

1. Calcium
2. Iron
3. Sodium
4. Zinc

Answer : A.  Calcium

16. The vitamin which is very liable and easily destroyed during cooking as well as storage is

1. Vitamin A
2. Vitaminb6
3. Vitamin C
4. Vitamin K

Answer : C.  Vitamin C

17. The compound used in anti-malarial drug is

1. Aspirin
2. Neoprene
3. Isoprene
4. Chloroquin

Answer : D.  Chloroquin

18. Which of the following is a skin disease?

1. Anaemia
2. Pellagra
3. Osteomalacia
4. Rickets

Answer : B.  Pellagra

19. The richest source of vitamin D is

1. Cod liver oil
2. Spinach
3. Milk
4. Cheese

Answer : A.  Cod liver oil

20. Which of the following tests helps in diagnosis of cancer?

1. X-ray
2. Urine test
3. Blood test
4. Biopsy test

Answer : D.  Biopsy test