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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