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