Agriculture Quiz 42

1. Stomata are regulated by

A) N

B) P

C) K

D) Ca

2. Maximum density of water exists at

A) 0°C

B) 4°C

C) 40°C

D) 100°C

3. Plant lost water in transpiration up to the extent of

A) 80%

B) 90%

C) 95%

D) 99%

4. The chemical nature of GA3 is

A) Phenolic

B) Terpene

C) Purine

D) Indole

5. Guttation is not favoured under

A) Low humidity

B) High humidity

C) Low root pressure

D) High humidity and low root pressure

6. The xylem and phloem elements in the plant are surrounded by a layer of living cells called

A) Casparian strips

B) Pericycle

C) Stele

D) Endodermis

7. A plant hormone which is primary regulator of abscission process is

A) Ethylene

B) Auxin

C) ABA

D) Gibberellins

8. Growing of plant in soilless nutrient solution is referred as

A) Aeroponics

B) Hydroponics

C) Xeroponics

D) Thaloponics

9. Most commonly grown crop plants are included in

A) Halophytes

B) Glycophytes

C) Sciophytes

D) Xerophytes

10. Optimum temperature for maximum crop development in wheat is

A) 10–15°C

B) 20–25°C

C) 25–30°C

D) 30–35°C

11. ‘Little leaf’ and ‘rosette’ of apple, ‘white bud’ of maize are the deficiency symptoms of

A) Fe

B) Zn

C) Cl

D) Mo

12. In citrus plant, die back disease is the result of deficiency of

A) N

B) P

C) Boron

D) Copper

13. Acid rains are due to which of the following gases?

A) CO₂ and CO

B) Ozone and CO₂

C) NO₂ and SO₂

D) NH₃ and CO₂

14. Which one of the following is the most harmful pollutant by automobiles?

A) SO₂

B) CO

C) N₂O

D) CO₂

15. Callus is induced to form roots in the medium of

A) Auxin

B) Cytokinins only

C) More cytokinins than auxin

D) More auxin than cytokinins

16. Blue light is always less efficient in photosynthesis than

A) White

B) Red

C) Orange

D) Violet

17. Protein content in pulses ranges from

A) 10–15%

B) 20–25%

C) 25–30%

D) 40–45%

18. Protein content of cereals ranges from

A) 8–12%

B) 12–15%

C) 15–20%

D) 20–25%

19. Natural inhibitor of IAA oxidase is

A) Caffeic acid

B) Coumaric acid

C) ABA

D) Lactic acid

20. How many ATP are required to produce 1 mole of hexose in photosynthesis?

A) 8

B) 18

C) 28

D) 38

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