Question Paper Olympiad NSO Science

1.   Which of the following is incorrectly paired ?
(a) Rose – Cutting                                                         
(b) Bougainvillea – Budding
(c) Apple – Grafting                                                      
(d) Grape vine – Layering                            
Ans (b)
2.   Tissue culture is important for certain crops and few commercially important plants. Select the incorrect statement about the advantages of this technique.
(a) It takes up relatively little space compared with growing plants in fields.
(b) It can be carried out independently of seasonal changes of climate.
(c) It is suitable for propagation of only seedless plants.
(d) It produces disease free plants.                             
Ans (c)
3.   Which of the following is a characteristic of wind pollinated flowers ?
(a) Pollen grains are heavy and dry whereas the stigma is short and sticky.
(b) Flowers are brightly coloured.
(c) Pollen grains are light, small and dusty whereas the stigma is hairy and feathery.
(d) Flowers are small with nectar and fragrance.    
Ans (c)
4.   Which of the following fuses with a male gamete to form a triploid endosperm nucleus ?
(a) Secondary nucleus                                             
(b) Polar nuclei
(c) Egg apparatus                                                
(d) Either (a) & (b)                                          
Ans (d)
5.   Which of the following methods of preventing pregnancy, act by changing hormonal balance of the body so that eggs are not released and fertilization cannot occur ?
(a) Creating a mechanical barrier                                              
(b) Taking oral pills
(c) Using IUCDs                                                       
(d) Using copper-T                                         
Ans (b)
6.   Which of the following statement is incorrect ?
(a) Placenta allows exchange of materials between mother and foetus.
(b) The foetal part of the placenta consists of the cells of the chorion which produce projections called chorionic villi.
(c) Antibody cannot cross the placenta from mother to foetus.
(d) Placenta also secretes pregnancy hormones in great amounts.                                                          
Ans (c)
7.   It is a unicellular organism, which develops protective wall during unfavorable conditions and on getting favorable conditions splits to form many new organisms at the same time. Identify the organism.
(a) Mucor                                                                
(b) Amoeba
(c) Trypansoma                                                     
(d) Leishmania                                                 
Ans (b)
8.   In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation is :
(a) 25 %                                                           
(b) 50 %
(c) 75 %                                                                 
(d) 100 %                                                            
Ans (b)
9.   Genetic drift is defined as :
(a) A random change in gene frequencies from one generation to the next.
(b) A change in an allele due to alteration in the DNA molecule.
(c) A change in gene frequencies due to exchange of genes between different populations
(d) A product of natural selection                        
Ans (a)
10.   During the early stages of development, the embryos of reptiles, birds and mammals look very similar. This suggests that reptiles, birds and mammals :
(a) Have evolved from a common ancestor.
(b) Live in same type of environment.
(c) Have undergone parallel evolution.
(d) Are no longer undergoing evolution.                       
Ans (a)
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