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Q1. Premature fruit fall results in significant loss of yield in some cases. This can be stopped by
Q2. Exposure to carbon monoxide (from coal gas) is extremely dangerous and can kill a patient because
Q3. Heart murmur is due to a
Q4. We lose consciousness if blood flow to the brain is cut off for more than
Q5. Which of the following plant hormone is involved in bolting of the rosette plants?
Q6. A particular cell organelle is sometimes referred to as the 'suicide bag' because it contains certain enzymes that can break down the cell components or even the whole cell. Which one of the following is such an organelle?
Q7. A new technique that is noninvasive, does not utilize radiation, and gathers biochemical information without time-consuming chemical analyses is
Q8. Freshly passed urine has hardly any smell but when it is allowed to stand, it develops a strong ammoniacal odour owing to
Q9. It is related to the following Figure: Labels in the Figure represent the route of reflex arc. The labels 1 to 6 are:
Q10. The tests normally descend into the scrotum about
Q11. Menopaus normally occurs between
Q12. In humans, ovarian follicles reach maturity from the beginning of a menstrual cycle in
Q13. The adult human skeleton consists of
Q14. The total number of ear bones are
Q15. A fish that is devoid of any scales is
Q16. Most fish do not sink in water due to the presence of
Q17. Which of the following animals have flippers?
Q18. The largest of the living birds is
Q19. The mammal that lays eggs is
Q20. Pseudocoel is present in
Q21. Bacteriophages are
Q22. The scientist who first isolated a virus in pure crystalline form was awarded a Nobel prize for his con­tribution. Which of the following was this scientist?
Q23. Much of our present-day knowledge in molecular genetics has been obtained by using the bacterium E.coli. If we were to collect samples of this bacterium, where should we look for it?
Q24. A bacterium divides every minute and takes an hour to fill a cup. How much time will it take to fill half the cup?
Q25. That genes control heredity through their control on enzyme synthesis and that one gene controls the synthesis of one enzyme-the one gene one enzyme hypothesis-was proposed by .
Q26. Gene, the basic unit of heredity, was first synthesized in the laboratory by
Q27. Gregor Mendel is often referred to as the Father of Genetics since he first enunciated the Principles of Heredity. His experimental material was
Q28. A pair of chromosomes determines sex in human beings and, therefore, these chromosomes are called sex chromosomes. What is the name given to the other chromosomes?
Q29. Which of the following human disease/s is/are hereditary in nature?
Q30. A white woman marries a black man. They have four children-2 sons and 2 daughters. What proportion of these children is likely to be black
Q31. That some human diseases are genetically controlled was first established by
Q32. Which of the following human disease/s is/are controlled by heredity?
Q33. Famous case in Mumbai a young. woman sued a movie star for support of her child, claiming that he was the father. By testing the blood of the three persons involved, it was found that the woman (mother) was of group A, the child was B, and the accused man (movie star) was O. The judge considered the available evidence and decreed in favour of the woman. If you were the judge, how would you have decided the case?
Q34. If an old tree is cut transversely, distinct growth rings are visible and it is possible to calculate the age of a tree by counting such rings. These rings are most prominent in
Q35. In some arctic and alpine regions, the snow appears red. This 'red snow' phenomenon is caused by
Q36. Most higher plants are incapable of making use of free atmospheric nitrogen and have, therefore, to be supplied with costly nitrogenous fertilizers costing billions of rupees every year. However one of the following groups of plants is capable of fixing atmospheric nitrogen, thus, enriching the soil. Identify this group
Q37. Red tides in the west coast of Florida resulting in the death of hundreds of millions of fish. Such tides are caused by
Q38. Nori has been a favourite Japanese food for centuries. This is prepared/obtained from
Q39. The red rust of tea is caused by
Q40. Lichen is a symbiotic association between an alga and which one of the following?
Q41. Some plants develop fruits without fertilization. This phenomenon is called
Q42. Litmus is obtained from
Q43. Some flowering plants produce allergenic pollen grains. Which of the following is/are such plants?
Q44. 'Sulphur shower' is
Q45. Which of the following statements about green plants is true?
Q46. Which of the following spices is obtained from roots?
Q47. Which of the following spices is obtained from flower buds?
Q48. Which of the following plant disease is caused by bacteria?
Q49. Alexander Fleming discovered the wonder drug 'penicillin'. The first clinical tests for this drug were conducted in the year
Q50. The antibiotic penicillin is obtained from
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