MPTET Biology Exam - March 28, 2025

1. The oxidizing stability of vegetable oil is due to the presence of:
   A. Tocopherol
   B. Aldehydes
   C. Phosphatides
   D. Vitamins
   Answer: A. Tocopherol
2. The browning on the cut surface of an apple is an example of:
   A. Caramelization
   B. Maillard reaction
   C. Protein denaturation
   D. Enzymatic browning
   Answer: D. Enzymatic browning
3. The yellow-orange color of carrots and tomatoes is due to:
   A. Porphyrins
   B. Carotenoids
   C. Flavonoids
   D. Betalains
   Answer: B. Carotenoids
4. Which of the following is a seed-borne disease?
   A. Powdery mildew of pea
   B. Loose smut of wheat
   C. Lentil rust
   D. Cercospora leaf spot of mungbean
   Answer: B. Loose smut of wheat
5. Rice Khaira disease is caused due to deficiency of:
   A. B
   B. Fe
   C. Mn
   D. Zn
   Answer: D. Zn