641. A person with vision defect “Myopia ‘can see-

1. Nearby objects clearly
2. Distant objects clearly
3. Nearby as well as distant object clearly
4. Neither nearby nor distant objects clearly

Option “1” is correct.
Near-sightedness or myopia as it is medically termed is a vision condition in which close objects are seen clearly, but objects faraway appear blurred. It can be corrected by wearing concave or divergent lenses.
642. Japanese encephalitis is caused by:

1. Bacteria
2. Virus
3. Parasitic protozoan
4. Fungus

Option “2” is correct.
Encephalitis virus is the causing factor of Japanese encephalitis.
643. When does heart rest?

1. Never
2. While sleeping
3. Between two beats
4. While doing yoga

Option “3” is correct.
Each ‘heartbeat’ consists of a contraction and relaxing of the heart muscles. When the heart contracts, it pumps blood through the blood vessels. When it relaxes, it draws blood in. It takes rest between relaxation and contraction.
644. How many chambers are there in heart?

1. 2
2. 4
3. 6
4. 8

Option “2” is correct.
In humans, other mammals and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right ventricles.
645. Which one of the following diseases cannot be controlled by vaccination?

1. Diabetes
2. Polio
3. Whooping cough
4. Small pox

Option “1” is correct.
Whooping cough is caused by a bacterium called Bordetella pertussis. Polio is caused by virus; Small pox is also caused by virus. All the three can be prevented by vaccination. Diabetes is a disease associated with insulin imbalance which cannot be prevented by vaccinatio
646. Who discovered that plants trees also have life?

1. Robert Koach
2. J.C. Bose
3. Benjamin Franklin
4. Louis pasture

Option “2” is correct.
Indian scientist Jagadish Chandra Bose discovered that plants and trees also have a life.
647. Dolphins are classified in-

1. Fish
2. Amphibians
3. Reptile
4. Mammals

Option “4” is correct.
Dolphins are highly intelligent marine mammals and are part of the family of toothed whales. India has declared Ganga Dolphin as the national aquatic animal of India.
648. CDRI (India) is located at:

1. Allahabad
2. Delhi
3. Bangalore
4. Lucknow

Option “4” is correct.
CDRI (central Drug research institute) is located in Lucknow.
649. Which of the following plant is used for ‘bio-diesel?’

1. Sugarcane
2. White carrot
3. Senna
4. Jatropha curcas

Option “4” is correct.
Jatropha Curcas, the plant is considered a future feedstock for biodiesel production . The seeds of these plants are used as biodiesel. Biodiesel has become more attractive because of its environmental benefits and it is obtained from renewable resources.
650. Golden Rice is a rich source of:

1. Vitamin A
2. Vitamin B
3. Vitamin K
4. Vitamin C

Option “1” is correct.
Golden rice is a variety of rice (Oryza sativa) produced through genetic engineering to biosynthesize beta-carotene, a precursor of vitamin A, in the edible parts of rice.
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