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Zoology Objective Questions and Answers for Competitive Exams | Page-3

21 ‘ELISA’ test is employed to diagnose:
A Cancer
B Polio virus
C AIDS antibodies
D Tuberculosis bacterium

Answer: Option [D]
22 Why excessive heating and repeated use of cooking oil is most undesirable?
A Loss and wastage of oil
B Nutrient value of food is lost
C Carcinogenic substances like benzpyrene are produced
D The oil vapours can cause indoor population

Answer: Option [C]


23 Which one of the following is a female sex hormone?
A Estrogen
B Insulin
C Oxytocin
D Androgen

Answer: Option [A]
24 Labourers who do hard manual labour develop thick skin on their palms and soles due to:
A thick epidermis
B thick dermis
C thick subcutaneous tissue
D all of these

Answer: Option [D]
25 AIDS virus has:
A single-stranded RNA
B double stranded RNA
C single stranded DNA
D double stranded DNA

Answer: Option [A]
26 A ‘breath test’ used by traffic police to check drunken driving uses:
A turmeric on filter paper
B silica gel coated with silver nitrate
C potassium perma-nganate-sulphuric acid
D potassium dichromate-sulphuric acid

Answer: Option [D]
27 Anglo-Nubian is a breed of:
A Sheep
B Goat
C Poultry
D Cattle

Answer: Option [B]
28 What kind of soil is treated with gypsum to make it suitable for cropping?
A Acidic
B Alkaline
C Water-logged
D Soil with excessive clay content

Answer: Option [A]
29 Typhoid fever is caused by-
A allergy
B fungus
C bacteria
D virus

Answer: Option [C]

Typhoid fever is a life-threatening illness caused by Salmonella Typhi bacteria. Paratyphoid fever is a life-threatening illness caused by Salmonella Paratyphi bacteria.

30 Which of the following blood group is a universal recipient?

Answer: Option [C]

NCERT Class 12 Biology Solved Multiple Choice Questions

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