61. In which part of the eye lies the pigment that decides the colour of the eyes of a person?

1. Cornea
2. Choroid
3. Iris
4. Vitreous body

Option “3” is correct.
The iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupils and thus the amount of light reaching the retina. “Eye color” is the color of the iris, which in humans can be green, blue, black or brown.
62. The presence of what distinguishes a plant cell from an animal cell?

1. Chloroplasts
2. Protoplasm
3. Cell membrane
4. Nucleus

Option “1” is correct.
Animal cells do not have chloroplasts but plant cells do.
63. Edward Jenner is associated with –

1. Cholera
2. Typhoid
3. Small Pox
4. Paralysis

Option “3” is correct.
Edward Anthony Jenner was an English physician and scientist from Berkeley, Gloucestershire, who was the pioneer of smallpox vaccine. He is often called “the father of immunology”.
64. On the average, what percentage of human body has the element of oxygen?

1. 65
2. 25
3. 10
4. 5

Option “1” is correct.
In the human body, the oxygen is absorbed by the blood stream in the lungs, being then transported to the cells where an elaborated change process takes place. Approximately 65% of human body contains oxygen.
65. A large blood vessel that carries blood away from the heart is called –

1. Vein
2. Artery
3. Capillary
4. Nerve

Option “2” is correct.
Arteries carry oxygenated blood away from the heart to the tissues.
66. Plants which grow on saline soils are-

1. Xerophytes
2. Hydrophytes
3. Halophytes
4. Succulents

Option “3” is correct.
A halophyte is a plant that grows in waters of high salinity, coming into contact with saline water through its roots or by salt spray, such as in saline semi-deserts, mangrove swamps, marshes and sloughs and seashores.
67. Animals living on the tree trunks are known as-

1. Arboreal
2. Volant
3. Amphibious
4. Aquatic

Option “1” is correct.
Arboreal animals are creatures who spend the majority of their lives in trees. They eat, sleep and play in the tree canopy. There are thousands of species that live in trees, including monkeys, koalas, possums, sloths, various rodents, parrots, chameleons, geckos, tree snakes and a variety of insects.
68. Tuberculosis is caused by a-

1. Bacterium
2. Virus
3. Fungus
4. Protozoa

Option “1” is correct.
Tuberculosis (TB) is an infectious disease usually caused by the bacterium Mycobacterium tuberculosis (MTB). It generally affects the lungs, but can also affect other parts of the body.
69. Which of the following pairs is not correctly matched?

1. Vitamin B6 : Pyridoxine
2. Vitamin C : Ascorbic acid
3. Vitamin E : Alpha tocopherol
4. Vitamin D : Sunshine

Option “4” is correct.
Sunlight is source of Vitamin D not its chemical name.In humans, the most important compounds in this group are vitamin D3 (also known as cholecalciferol) and vitamin D2 (ergocalciferol).
70. The enzyme that is present in the saliva of man is –

1. Pepsin
2. Renin
3. Amylase
4. Trypsin

Option “3” is correct.
Saliva contains the enzyme amylase, also called ptyalin, which is capable of breaking down starch into simpler sugars such as maltose and dextrin that can be further broken down in the small intestine.
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