Which of the following is the strongest part of our body ?
Correct Answer:
(B)
Enamel
Tooth enamel is the thin outer covering of the tooth and the strongest part of our body. It makes our teeth white and it exists to protect the crowns of healthy teeth. Tooth decay is due to the destruction of tooth enamel. It is made up of hydroxyapatite crystals, which is mainly calcium phosphate.
Ques:
42
The strongest muscle in human body is found in:
Correct Answer:
(A)
Jaws
The strongest muscle based on its weight is the masseter, known as jaw muscle. With all muscles of the jaw working together, it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars
Ques:
43
Hair is composed of protein called –
Correct Answer:
(C)
Keratin
Hair is composed of the protein keratin, which is also the primary component of finger and toe nails.
Ques:
44
Match List-I with List-II and select the correct answer using the codes given below the lists :
List-I List-II
(Bones) (Names)
A. Breastbone 1. Clavicle
B. Collarbone 2. Patella
C. Knee-cap 3. Scapula
D. Shoulder blade 4. Sternum
Code : A B C D
Correct Answer:
(D)
4 1 2 3
The correctly matched lists are as follows :
Breastbone – Sternum
Collarbone - Clavicle
Knee-cap - Patella
Shoulder blade – Scapula
Ques:
45
There are how many pairs of cranial nerves in human?
Correct Answer:
(B)
12
Nerves that exit from the cranium are called cranial nerves. There are 12 pairs of cranial nerves which are found on the ventral (bottom) surface of the brain.
Ques:
46
How many pairs of nerves arise from the spinal cord?
Correct Answer:
(B)
31
Nerves that arise from the spinal cord are called spinal nerves. A spinal nerve is a mixed nerve, which carries motor, sensory and autonomic signals between the spinal cord and the body. In human there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccygeal regions of the spine. There are eight pairs of cervical nerves, twelve pairs of thoracic nerves, five pairs of lumbar nerves, five pairs of sacral nerves and one pair of coccygeal nerves. The spinal nerves are part of the peripheral nervous system.
Ques:
47
The brain is responsible for:
Correct Answer:
(D)
All of the above three
The brain is composed of the cerebrum, cerebellum, and brainstem. The cerebrum is the largest part of the brain and it performs higher functions like interpreting touch, vision and hearing as well as speech, reasoning, learning and fine control of movement. The function of the cerebellum is to coordinate muscle movements, maintain posture and balance. The brainstem performs many automatic functions such as breathing, heart rate, body temperature, woke and sleep cycles, digestion, etc. Hence, option (d) is the correct answer.
Ques:
48
The heart of human embryo starts beating?
Correct Answer:
(C)
In the fourth week of its development
About 4-5 weeks after fertilization, when the heart first begins to beat, the sound of the little heart is too soft to hear. In 4 weeks, the heart typically beats between 105 to 121 times per minute.
Ques:
49
Match the hormones in List-I with items in List-II and select the correct answer using the codes given below:
List-I List-II
Adrenaline 1. Anger, fear, danger
Estrogen 2. Attracting partners through sense of smell
Insulin 3. Females
Pheromones 4. Glucose
Correct Answer:
(C)
1342
Adrenaline - Anger, fear, danger
Estrogen - Females
Insulin - Glucose
Pheromones - Attracting partners through the sense of smell
Ques:
50
With reference to the human body, consider the following statements:
The production of somatotropin goes up when a person exercises.
Men's testes produce progesterone.
Women's adrenal glands secrete testosterone.
Stress causes the adrenals to release very less amount of cortisol than usual.
Which of these statements are correct?
Correct Answer:
(B)
1, 2 and 3
Growth hormone (GH), also known as somatotropin, is a peptide hormone that stimulates growth, cell production and regeneration in human and other animals. The production of somatotropin goes up when a person exercises. Progesterone is primarily a female sex hormone, but it is produced in small amount within men. Progesterone is produced in the ovaries, adrenal glands, testes and brain, and in the placenta during pregnancy. Testosterone is a naturally occurring sex hormone that is produced in a men’s testicles. Small amount of testosterone is also produced in a woman’s ovaries and adrenal glands. Cortisol is produced in humans by the zona fasciculata of the adrenal cortex within the adrenal gland. Its release is increased in response to stress and low blood- glucose concentration.