Plant Nutrients and Physiology

1. Which vitamin is abundantly found in carrots?
   (A) Vitamin A
   (B) Vitamin C
   (C) Vitamin D
   (D) Vitamin E
   Answer: (A)
2. What happens when iodine solution is added to a freshly cut surface of a potato tuber?
   (A) Brown turns blue-black
   (B) Brown turns orange-red
   (C) Blue turns pink
   (D) Pink turns blue-green
   Answer: (A)
3. Which type of sugar is present in ripe grapes?
   (A) Fructose
   (B) Sucrose
   (C) Galactose
   (D) Glucose
   Answer: (A)
4. Which of the following is a micronutrient essential for plant growth?
   (A) Carbon
   (B) Oxygen
   (C) Nitrogen
   (D) Boron
   Answer: (D)
5. Yellowing spots on citrus leaves indicate a deficiency of:
   (A) Zinc
   (B) Magnesium
   (C) Boron
   (D) Iron
   Answer: (B)
6. Chlorophyll molecule contains which of the following elements?
   (A) Iron
   (B) Magnesium
   (C) Cobalt
   (D) Zinc
   Answer: (B)

🌿 Plant Adaptations and Special Features

7. Which of the following is a carnivorous plant?
   (A) Balanophora
   (B) Rafflesia
   (C) Orobanche
   (D) Drosera
   Answer: (D)
8. In plant-water relationships, the symbol Ψ represents:
   (A) Osmotic pressure
   (B) Water potential
   (C) Solute potential
   (D) Osmosis
   Answer: (B)
9. Membrane lipids in cold-sensitive plants typically have:
   (A) Low saturated fatty acids
   (B) Low unsaturated fatty acids
   (C) Equal saturated and unsaturated fatty acids
   (D) High unsaturated fatty acids
   Answer: (D)
10. What is the role of quarantine regulations in plant health?
    (A) Cultivating superior varieties
    (B) Preventing entry of infected organisms
    (C) Spraying insecticides on infected plants
    (D) Identifying plant diseases
    Answer: (B)
11. Which among the following is not a carnivorous plant?
    (A) Nepenthes
    (B) Utricularia
    (C) Drosera
    (D) Cuscuta
    Answer: (D)

🌼 Plant Products and Classification

12. Curcumin is extracted from:
    (A) Garlic
    (B) Turmeric
    (C) Sunflower
    (D) Rose
    Answer: (B)
13. Autotrophic thallophytes with chlorophyll are known as:
    (A) Algae
    (B) Lichens
    (C) Fungi
    (D) Bryophytes
    Answer: (A)
14. Which angiosperm is characterized by absence of xylem vessels?
    (A) Hydrilla
    (B) Trochodendron
    (C) Maize
    (D) Wheat
    Answer: (B)

🍃 Photosynthesis and Related Processes

15. Conversion of starch into sugar is essential for:
    (A) Stomatal opening
    (B) Stomatal closing
    (C) Stomatal formation
    (D) Stomatal growth
    Answer: (A)
16. A green plant observed under red light appears:
    (A) Green
    (B) Red
    (C) Violet
    (D) Black
    Answer: (D)
17. Hydroponics is a technique for growing plants without:
    (A) Sand
    (B) Soil
    (C) Water
    (D) Light
    Answer: (B)
18. The dissipation of excess light energy during photosynthesis is called:
    (A) Quenching
    (B) Scavenging
    (C) Photolysis
    (D) Photophosphorylation
    Answer: (A)

🦠 Plant Pathology and Modifications

19. Which bacterium causes crown gall disease in plants?
    (A) Bacillus thuringiensis
    (B) Agrobacterium tumefaciens
    (C) Pseudomonas fluorescens
    (D) None of the above
    Answer: (B)
20. Which of the following is not a stem modification?
    (A) Onion bulb
    (B) Arvi corm
    (C) Sweet potato tuber
    (D) Potato tuber
    Answer: (C)