1) Who discovered ribosomes__________________? a. Palade b. Altmann c. Cowdry d. Garner
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2) What is the function of Gorge bodies__________________? a. Photosynthesis b. Protein synthesis c. Segregation of the products of sunthesis d. RNA synthesis
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3) The smallest cell organelle so far is_____________________? a. Peroxisome b. Spherosome c. Ribosome d. Lysosome
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4) The maximum magnification possible within electron microscope is____________________? a. 2000 times b. 4000 times c. 400,000 times d. 200,000 times
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5) The outer most part of plant cell is____________________? a. Plasma membrane b. Epidermis c. Nuclear membrane d. Cellulose cell wall
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6) The membrane which surrounds the___________________? a. Nucleus b. Chloroplast c. Vacuole d. Cutoplasm
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7) In cereals limiting amino acids are________________? a. Threonine b. Lysine c. Methionine d. a and b
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8) In maize source of high lysine is___________________? a. Opaque 2 b. Proline c. Gang as d. African tall
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9) The term useful heterosis was first used by__________________? a. Meredith and Bridge (1972) b. Richey (1914) c. Jenkins (1935) d. Hull (1950)
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10) Top cross was first suggested by__________________? a. Simmonds (1979) b. East (1908) c. Davenport (1908) d. Davis (1927)
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11) Heterosis can be fully exploited in the form of_____________________? a. Composites b. Hybrids c. Multi lines d. Synthetics
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12) Heterosis can be fixed by___________________? a. Apomixis b. Polyploidy c. Asexual reproduction d. All the above
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13) Out breeding leads to reproduction in____________________? a. Heterozygosity b. Homozygosity c. Population mean d. None of the above
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14) Colchicum () is extracted from__________________? a. Seed b. Bulb c. Fruit d. Flower
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15) A nullisomic individual is represented by________________? a. 2n-1 b. 2n+1 c. 2n-2 d. 2n+2
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16) The change in chromosome number which involves the entire set of genome is known as______________? a. Anenploidy b. Euploidy c. Trisomy d. all the above
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17) In primary trisomic the extra chromosome is__________________? a. Isochromosome b. Traits located chromosome c. Normal chromosome d. None of the above
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18) Stadler, first used X-rays for induction of mutation in_________________? a. Oat b. Maize c. Wheat d. Barley
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19) A mutation which kills 50% of the individual that carry the mutation is known as_________________? a. Lethal mutation b. Sub lethal mutation c. Vital mutation d. Sub-vital mutation
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20) In Incern, resistance to spotted aphid is associated with__________________? a. low sinigen in leaves b. High saponin in leaves c. High DIMBOA in leaves d. High silicant content
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