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971. Which of the following are most penetrating ?
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
Explanation:
972. The corners of the cells or collenchyma tissue in plants are thickened due to the deposition of :
A. Lignin and Suberin
B. Suberin and Cutin
C. Cellulose and Pectin
D. Chitin and Lignin
Explanation:
973. Which of the following are correctly matched ? 1. Haemoglobin Transport protein2. Myosin and actin Contractile proteins3. Collagen proteins Structural4. Gamma globulins Protective proteins
A. 1, 2 and 4
B. 1, 3 and 4
C. 1, 2 and 3
D. 1, 2, 3 and 4
Explanation:
974. Which of the following is used as a coolant in nuclear reactors ?
A. Heavy water
B. Cadmium
C. Liquid sodium
D. Graphite
Explanation:
975. Which AIDS is correct ?
A. It does not affect women
B. It generally affects the brain
C. AIDS virus can vary its genetic code outwitting a vaccine
D. all those infected by a blood transfusion get AIDS within five years
Explanation:
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