(c) six billion, two hundred million cells
    (d) eight billion, two hundred million cells
Ans: (b)
9.  The plant cells are surrounded rigidly by
    (a) plasmalemma
    (b) cell membrane
    (c) cell wall
    (d) plasma membrane
Ans: (c)
10. Which of the following plays an important part in photosynthesis?
    (a) Chloroplast
    (b) Centrosome
    (c) Tonoplast
    (d) Nematoblast
Ans: (a)
11. Total number of amino acids in plants is
    (a) 10
    (b) 20
    (c) 30
    (d) Plenty
Ans: (b)
12. The protein synthesis takes place in
    (a) Ribosomes
    (b) Chromosomes
    (c) DNA
    (d) None of these
Ans: (a)
13. Heart is made up of
    (a) nonstriated muscle
    (b) cardiac muscle
    (c) connective tissue
    (d) nervous tissue
Ans: (b)
14. Dr Khorana"s work relates to
    (a) synthesis of simple DNA
    (b) genetic code
    (c) reduction of mutation
    (d) synthesis of RNA from bacterial cell
Ans: (b)
15. The function of connective tissue is
    (a) to hold the other tissues together
    (b) to facilitate diffusion
    (c) to help transportation of dissolved material from capillaries to epithelial cells
    (d) protection
Ans: (a)
16. The science of improving the hereditary qualities of future generations of mankind is referred to as
    (a) genetics