Biology Quiz – Biology Objective Questions for Competitive Exams

1. Most of the plants obtain nitrogen from the soil in the form of
  • (A) Free nitrogen gas
  • (B) Nitric acid
  • (C) Nitrites
  • (D) Nitrates

2. Carbon becomes available to crop plants in the form of
  • (A) Amino acids
  • (B) Carbonates
  • (C) Carbon dioxide
  • (D) Element carbon

3. Growth curve is always
  • (A) Curved
  • (B) Straight line
  • (C) Sigmoid
  • (D) Both (A) and (B)

4. Full form of 2-4D is–
  • (A) 2-4 Dichloronephthalic acid
  • (B) 2-4 Dichlorophenoxy acetic acid
  • (C) 2-4 Dichlorobutyric acid
  • (D) 2-4 Dichloroacetic acid

5. Chlorophyll contain–
  • (A) Mg
  • (B) Fe
  • (C) K
  • (D) Mn

6. The chief element among the following required by a plant for making its proteins-
  • (A) Iron
  • (B) Calcium
  • (C) Magnesium
  • (D) Nitrogen

7. which of the following plants cannot fix atmospheric nitrogen directly
  • (A) Pea
  • (B) Bean
  • (C) Horse grams
  • (D) Castor

8. A bulk of nitrogen in nature is fixed by-
  • (A) Lightening
  • (B) Denitrifying bacteria
  • (C) Symbiotic bacteria
  • (D) Chemical industries

9. Proteins are made up of
  • (A) Sugars
  • (B) Fatty acids
  • (C) Amino acids
  • (D Nucleic acid

10. The correct sequence of growth is-
  • (A) Cell division-cell elongation-cell differentiation
  • (B) Cell division-differentiation-elongation
  • (C) Division differentiation
  • (D) Elongation-division-differentiation

11. Regulation of plant growth is due to
  • (A) Growth hormones
  • (B) Environment
  • (C) Genetics of plants
  • (D) Environment and growth hormones

12. Main function of Xylem is
  • (A) Mechanical support
  • (B) Conduction of water
  • (C) Protection
  • (D) Both (A) and (B)

13. Raw material for photosynthesis is-
  • (A) Water
  • (B) CO
  • (C) Both (A) & (B)
  • (D) SO2

14. Light reaction of photosynthesis occurs in-
  • (A) Grana
  • (B) Stomata
  • (C) Chloroplast membrane
  • (D) Cytoplasm

15. The dark reaction in photosynthesis so called because it
  • (A) Needs darkness
  • (B) Cannot occur in light
  • (C) is accelerated at night
  • (D) Does not require light energy

16. Energy rich compound produced in respiration is-
  • (B) ADP
  • (A) ATP
  • (C) AMP
  • (D) ACP

17. In presence of light, green plants convert carbon dioxide and water into food stuffs. Which of the following is likely to be the first substance that a green plant makes in photosynthesis
  • (A) A simple sugar
  • (B) Starch
  • (C) Cellulose
  • (D) Fats

18. Leaves appear green because they–
  • (A) Absorb green lights
  • (B) Reflect green light
  • (C) Both absorb and reflect green light
  • (D) None of these

19. The first step in photosynthesis is the-
  • (A) Joining of 3-carbon atoms to form glucose
  • (B) Formation of ATP
  • (C) Ionization of water
  • (D) Excitement of an electron of chlorophyll by a photon of light

20. oxygen which is liberated during photo-synthesis comes from–
  • (A) Carbon dioxide
  • (B) Water
  • (C) Phosphoglyceric acid
  • (D) Chlorophyll

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