Class 9th Biology Chapter 2 Solving a Biological Problem

biology 9th notes Chapter No 2

1. Female Anopheles spreads:


2. Symptom of malaria is:          


3. Following is supported by a great deal of evidence: 


4. In man malarial parasite is transmitted by:


5. Observations are made with the help of:


6. Meaning of aria is:


7. In sparrows, malaria is spread by:


8. The biological method has played an instrumental role in scientific research for almost ______ years.


9. Dengue fever is transmitted by: 


10. Experimentation is only a step of the scientific process but it is very important step because it always:           


11. Logical consequence / results of hypothesis is:


12. A hypothesis must be testable to be scientifically valid. Being testable means that:


13. The first step to solve the biological problem is:


14. An irrefutable theory is called:


15. What would be the best experimental design for testing a hypothesis that bean plants require sodium?


16. Part of mosquito’s body which prevents the blood from clotting in its food canal after drawing blood:


17. Freezing point of water is less than its boiling point. Which type of observation is?


18. Deductions are drawn from:  


19. A ratio in scientific data may be expressed by putting a _____ mark between the two numbers.


20. In biological method the next step of hypothesis is called;


21. Chemical found in the bark of cinchona plant is:


22. At which point, is a biologist most likely to use reasoning?


23. Specific observations are used to draw a general hypothesis in _______.


24. Mosquito which spread malaria in sparrow is:


25. The most basic step of biological method is;


26. A biologist uses ______ for observations.


27. An Italian word “mala” means:


28. The word “Malaria” has been derived from which language?


29. Biological method has been playing an important role for the last;     


30. Biologists use reasoning to formulate a/an:


31. “Mosquitoes transmit Plasmodium and are involved in spread of malaria” this hypothesis was suggested by:


32. Choose the heavier product:  


33. Malaria is a/an _____ word.


34. How many senses a biologist uses for observations?


35. In which of the following biological problems, the knowledge of mathematics is used?


36. One liter of ethanol weighs:


37. Ronald Ross performed experiments in:


38. Which one is the correct sequence of biological method?


39. If Plasmodium is the cause of malaria, then all persons ill with malaria should have Plasmodium in their blood. The above statement is a:


40. An effective drug for malaria is:


41. Five senses are involved in:   


42. A scientific law is an irrefutable: 


43. Quinine is obtained from:      


44. Number of steps of biological method are:


45. Experiments on sparrow was performed by: 


46. The hypothesis that stand the test of time are called:


47. The logical consequences of hypothesis are called:


48. A gardener sees a large snake nearby. He knows that generally snakes sting, so the gardener ran away. The gardener did which of the following?


49. Proportion means to join two equal ratios by the sign of:


50. Bark of quina – quina was imported from:


51. The welts that appear after the mosquito leaves is a/an;    


52. Many plants from America sent back to Europe to be used as medicines in the:


53. A relation between the two numbers is called;


54. The tentative explanation of the observations is called:


55. Excellent medicine for treating malaria is:


56. Quantitative observation describes: 


57. __________format is used to organize scientific data.


58. Female mosquitoes need the blood of mammals or birds for;        


59. Tentative explanation of observation is called:


60. Malaria is caused by; 


61. Disease cured through Quinine from 17th to 20th century is:


62. Ratio may be expressed by putting a sign;


63. A scientific theory has which of the following properties?


64. Uniform or constant law of nature is.


65. You are testing a hypothesis; “students learn more if they drink tea before sitting for study”. Your 20 experimental students drink tea before study; you test their learning by giving question. Your 20 students of the control group should have all experimental conditions identical to the experimental group EXCEPT that;


66. Plasmodium is the cause of malaria. This statement is:


67. Biologists learn which hypothesis is correct through.


68. “It should be a general statement”, belongs to:


69. The scientific method in which biological problems are solved is:


70. Ross found that the saliva of the infected mosquito contained;


71. A physician A. F. A. King listed 20 observations in;            


Short Questions

Define ‘extremes’ in a proportion.
Define a law or principle.
Define bioinformatics.
Define deductive reasoning?
Define hypothesis.
Define scientific method.
Define theory. OR How a theory is formulated?
Describe meanings of words “mala” and “aria”.
Describe the experimentation.
Describe the services of the biological method.
Differentiate between Law and Theory.
Differentiate between ratio and proportion.
Give some examples of scientific laws.
Give two examples of Biological laws.
How are quantitative observations better in biology?
How did Darwin form his theory of evolution?
How does a female mosquito prevent the blood from clotting in her food canal?
How hypothesis is made?
How mathematics is an integral part of scientific methods?
How quantitative observations are more accurate than qualitative observations.
How the results are reported?
Justify man has always been a biologist.
Name the mosquitoes which spread malaria in human and sparrows.
Name the steps in biological method.
What are deductions?
What are the characteristics of a hypothesis?
What are the different formats of data organization?
What are the observations of A.F.A. King?
What do you know about observations?
What is a biological method?
What is a biological problem?
What is a hypothesis?
What is a productive theory?
What is a scientific law? Give two examples.
What is a theory?
What is biological method?
What is computational biology?
What is incubation period?
What is inductive reasoning?
What is meant by ‘means’ in a proportion?
What is meant by Bioinformatics?
What is meant by data organization?
What is meant by data?
What is the association of Anopheles mosquito with humans?
What is the difference between control group and experimental group? 
What is the relation of Cinchona with quina-quina?
What is the role of hypothesis?
What steps are included in solving a biological problem?
Why do welts appear after biting the mosquito?
Why is Cinchona bark important in biologist’s mind for treating malaria?
Why quantitative observations are more accurate than qualitative ones?
Write any two observations of A. F. A King. 
Write down importance of saliva for mosquitoes.
Write down the contributions of Dr. Laveran.
Write major observations about malaria.


Long Questions

Describe the steps involved in Biological Method
Write a note on Theory , Law and Principle.
Describe the steps involved in Biological Method taking malaria as an example.

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