81. How many types of white blood cells do we have?
(a) 3
(b) 5
(c) 7
(d) None of these
82. Which is a physical base of life?
(a) Nucleus
(b) Ribosome
(c) Protoplasm
(d) Mitochondria
83. The protoplasm of a child is exactly the same as that of its:
(a) Mother
(b) Father
(c) Grandfather
(d) Identical twin
84. The outermost layer of skin is known as:
(a) Epidermis
(b) Epiglottis
(c) Ligament
(d) Cartilage
85. Age of a tree can be determined by:
(a) Counting the number of rings in the stem
(b) Counting the number of leaves
(c) Counting the number of branches
(d) Measuring the size of the tree
86. Which of the following plays an important part in photosynthesis?
(a) Chloroplast
(b) Centrosome
(c) Tonoplast
(d) Nematocyst
87. Within the cell, the site of respiration is the
(a) Golgi bodies
(b) Ribosomes
(c) Mitochondria
(d) Nucleus
88. A Mitochondria possesses a
(a) Single membrane
(b) Double membrane
(c) Three-layered membrane
(d) Four-layered membrane
89. Blood does not coagulate inside the body due to the presence of:
(a) Hemoglobin
(b) Heparin
(c) Fibrin
(d) Plasma
90. Endoplasmic reticulum is bound by
(a) Cellulose
(b) Membranes
(c) Sclerotized layer
(d) Chitinized wall