Biology mcqs P#5

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Biology mcqs for mcat test 2020

81. Which structure is involved in plant gas exchange?
(A) stomata
(B) lenticels
(C) cuticle
(D) all of these

82. Common traits of human and insect trachea
(A) non-collapsiable wall
(B) supporting rings
(C) ectodermal origin
(D) endodermal origin

83. Vomiting occurs due to
(A) constipation
(B) diarrhoea
(C) antiperistalsis
(D) peristalsis

84. Photosynthetic prokaryotes lack
(A) ribosomes
(B) chloroplast
(C) cell-membrane
(D) vacuole

85. Which of the following organs does not have teeth in birds?
(A) crop
(B) syrinx
(C) stomach
(D) gizzard

86. The scientific name of jelly fish is
(A) Aurelia
(B) Madrepore
(C) Actinia
(D) Obelia

87. In which plants leaves are always in whorls
(A) lycopsids
(B) psilopsids
(C) sphenopsids
(D) pteropsids

88. In bacterial and viral infections, their number increases
(A) platelets
(B) RBC’s
(C) antibodies
(D) WBC’s

89. In plants, which are involved in the formation of testa
(A) tracheids
(B) sclereids
(C) sclerenchyma
(D) none of these

90. The etiolated plants lack

(A) chlorophyll
(B) xanthophyll
(C) caroteins
(D) none of these

91. Highly intelligent mammals are
(A) rat
(B) bat
(C) dolphin
(D) elephant

92. Plants absorb most of the water they need
(A) stem
(B) root hairs
(C) leaf
(D) bark

93. One of the following is not a function of bones
(A) support
(B) production of blood cells
(C) protein synthesis
(D) muscle attachment

94. Concentration is called cell movement against inclination
(A) active transport
(B) osmosis
(C) diffusion
(D) both b and c

95. (b) Ugly change of pollen from one quart
(A) germination of pollen grains
(B) transfer pollen from anther to stigma
(C) formation of pollen grains
(D) none of these

96. DNA structure was first described by
(A) Pasteur
(B) Robert Koch
(C) Watson and Crick
(D) Carlous Linnaues

97. The most abundant element in the Earth’s atmosphere is
(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Carbondioxide
(E) None of these


81. (D) all of these
82. (A) non-collapsiable wall
83. (C) antiperistalsis
84. (B) chloroplast
85. (D) gizzard
86. (A) Aurelia
87. (C) sphenopsids
88. (D) WBC’s
89. (B) sclereids
90. (A) chlorophyll
91. (C) dolphin
92. (B) root hairs
93. (C) protein synthesis
94. (A) active transport
95. (B) transfer pollen from anther to stigma
96. (C) Watson and Crick
97. (B) Nitrogen