NEET Biology 2019 Questions and Answers(31-40)

31. Select the incorrect statement.
(1) Male fruit fly is heterogametic
(2) In male grasshoppers 50% of sperms have no sex-chromosome
(3) In domesticated fowls, sex of progeny depends on the type of sperm rather than egg
(4) Human males have one of their sexchromosome much shorter than the other
 Answer (3) In domesticated fowls, sex of progeny depends on the type of sperm rather than egg
32. DNA precipitation out of a mixture of biomolecules can be achieved by treatment with
(1) Isopropanol (2) Chilled ethanol (3) Methanol at room temperature (4) Chilled chloroform
Answer (2) Chilled ethanol
33. Select the correct group of biocontrol agents.
(1) Bacillus thuringiensis, Tobacco mosaic virus, Aphids
(2) Trichoderma, Baculovirus, Bacillus thuringiensis
(3) Oscillatoria, Rhizobium, Trichoderma
(4) Nostoc, Azospirillium, Nucleopolyhedrovirus
Answer ( (2) Trichoderma, Baculovirus, Bacillus thuringiensis
34. Select the incorrect statement.
(1) Inbreeding increases homozygosity
(2) Inbreeding is essential to evolve purelines in any animal.
(3) Inbreeding selects harmful recessive genes that reduce fertility and productivity
(4) Inbreeding helps in accumulation of superior genes and elimination of undesirable genes
Answer (3) Inbreeding selects harmful recessive genes that reduce fertility and productivity
35. Match the following organisms with the products they produce
 (a) Lactobacillus                          (i) Cheese
 (b) Saccharomyces cerevisiae  (ii) Curd
 (c) Aspergillus niger                   (iii) Citric Acid
 (d) Acetobacter aceti                   (iv) Bread
                                                        (v) Acetic Acid
Select the correct option.
      (a) (b) (c) (d)
(1) (ii) (iv) (v) (iii)
(2) (ii) (iv) (iii) (v)
(3) (iii) (iv) (v) (i)
(4) (ii) (i) (iii) (v)
 36. What is the direction of the movement of sugars in phloem?
(1) Non-multidirectional (2) Upward (3) Downward (4) Bi-directional
Answer (4) Bi-directional
37. In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as
 (1) Autogamy (2) Parthenocarpy (3) Syngamy (4) Parthenogenesis
Ans: (4) Parthenogenesis
NEET Biology 2019 Questions and Answers
38. Persistent nucellus in the seed is known as
(1) Chalaza (2) Perisperm (3) Hilum (4) Tegmen
Ans: (2) Perisperm
39. What map unit (Centimorgan) is adopted in the construction of genetic maps?
 (1) A unit of distance between two expressed genes representing 10% cross over.
(2) A unit of distance between two expressed genes representing 100% cross over.
 (3) A unit of distance between genes on chromosomes, representing 1% cross over.
 (4) A unit of distance between genes on chromosomes, representing 50% cross over.
ans:  (3) A unit of distance between genes on chromosomes, representing 1% cross over.
40. What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
(1) 50 beats per minute (2) 75 beats per minute (3) 100 beats per minute (4) 125 beats per minute
Ans: (3) 100 beats per minute

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