NEET Biology 2020 Questions and Answers (61-70)

61. Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to

(1) Fungal diseases 

(2) Plant nematodes

(3) Insect predators 

(4) Insect pests

62. Meiotic division of the secondary oocyte is completed

(1) At the time of copulation

(2) After zygote formation

(3) At the time of fusion of a sperm with an ovum

(4) Prior to ovulation

63. Which of the following statements are true for the phylum-Chordata?

(a) In Urochordata notochord extends from head to tail and it is present throughout

their life.

(b) In Vertebrata notochord is present during the embryonic period only.

(c) Central nervous system is dorsal and hollow.

(d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata

(1) (c) and (a) 

(2) (a) and (b)

(3) (b) and (c)

 (4) (d) and (c)

64.Match the following columns and select the correct option.

Column-I                                                          Column-II

(a) Clostridium butylicum                                 (i) Cyclosporin-A

(b) Trichoderma polysporum                              (ii) Butyric Acid

(c) Monascus purpureus                                    (iii)Citric Acid

(d) Aspergillus niger                                          (iv) Blood cholesterol lowering agent

     (a) (b) (c) (d)

(1) (ii) (i) (iv) (iii)

(2) (i) (ii) (iv) (iii)

(3) (iv) (iii) (ii) (i)

(4) (iii) (iv) (ii) (i)

65. Which of the following pairs is of unicellular algae?

(1) Gelidium and Gracilaria

(2) Anabaena and Volvox

(3) Chlorella and Spirulina

(4) Laminaria and Sargassum

66. Presence of which of the following conditions in urine are indicative of Diabetes Mellitus?

(1) Uremia and Renal Calculi

(2) Ketonuria and Glycosuria

(3) Renal calculi and Hyperglycaemia

(4) Uremia and Ketonuria

67.  Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

(1) Growth response

(2) Defence action

(3) Effect on reproduction

(4) Nutritive value

68. Which of the following would help in prevention of diuresis?

(1) Reabsorption of Na+ and water from renal tubules due to aldosterone

(2) Atrial natriuretic factor causes vasoconstriction

(3) Decrease in secretion of renin by JG cells

(4) More water reabsorption due to undersecretion of ADH

69. Select the correct match

(1) Phenylketonuria – Autosomal dominant trait

(2) Sickle cell anaemia – Autosomal recessive trait, chromosome-11

(3) Thalassemia – X linked

(4) Haemophilia – Y linked

70. Which of the following is not an attribute of a population?

(1) Natality

(2) Mortality

(3) Species interaction

(4) Sex ratio


61. (4) Insect pests

62. (4) Prior to ovulation

63. (3) (b) and (c)

64.  (1) (ii) (i) (iv) (iii)

65. (3) Chlorella and Spirulina

66. (2) Ketonuria and Glycosuria

67. 2) Defence action

68. (1) Reabsorption of Na+ and water from renal tubules due to aldosterone

69. (2) Sickle cell anaemia – Autosomal recessive trait, chromosome-11

70. (3) Species interaction

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