SSC Biology Previous year questions Set 25

241. ‘ELISA’ test is employed to diagnose : [SSC CGL Prelim 2000]
A. Polio virus
B. AIDS antibodies
C. Tuberculosis bacterium
D. Cancer
Answer – C. Tuberculosis bacterium

242. Why excessive heating and repeated use of cooking oil is most undesirable?[SSC CGL Prelim 2000]
A. The oil vapours can cause indoor pollution
B. Carcinogenic substances like benzpyrene are produced
C. Nutrient value of food is lost
D. Loss and wastage of oil
Answer –B. Carcinogenic substances like benzpyrene are produced

243. Which one of the following is a female sex hormone?[SSC CGL Prelim 2000]
A. Estrogen
B. Androgen
C. Oxytocin
D. Insulin
Answer – A. Estrogen

244. What kind of soil is treated with gypsum to make it suitable for cropping?[SSC CGL Prelim 2000]
A. Alkaline
B. Acidic
C. Water-logged
D. Soil with excessive clay content
Answer –A. Alkaline

245. Clove, the commonly used spice, is obtained from the :[SSC CGL Prelim 2000]
A. root
B. stem
C. flower bud
D. fruit
Answer –C. flower bud

246. Reserpine is used to : [SSC CGL Prelim 2000]
A. reduce high blood pressure
B. increase blood pressure when it is low
C. alleviate pain
D. cure arthritis
Answer –A. reduce high blood pressure

247. A ‘breath test’ used by traffic police to check drunken driving uses:[SSC CGL Prelim 2000]
A. potassium dichromate-sulphuric acid
B. potassium perma-nganatesulphuric acid
C. turmeric on filter paper
D. silica gel coated with silver nitrate
Answer –A. potassium dichromate-sulphuric acid

248. Labourers who do hard manual labour develop thick skin on their palms and soles due to : [SSC CGL Prelim 2000]
A. thick epidermis
B. thick dermis
C. thick subcutaneous tissue
D. All of these
Answer –D. All of these

249. Maximum photosynthetic activity occurs in :[SSC CGL Prelim 2000]
A. blue and red region of light
B. green and yellow region of light
C. blue and orange region of light
D. violet and orange region of light
Answer –A. blue and red region of light

250. AIDS virus has : [SSC CGL Prelim 2000]
A. single-stranded RNA
B. double-stranded RNA
C. single-stranded DNA
D. double-stranded DNA
Answer –A. single-stranded RNA

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