Free Control and Coordination 01 Practice Test - 10th Grade
Question 1
Identify the given pathway and label A, B, C, and D.
Reflex arc, A - Receptor, B - Sensory neuron, C - Motor neuron, D - Relay neuron
Central Nervous System, A - Electrical impulse, B - Sensory neuron, C - Motor neuron, D - Nerve ending
Peripheral Nervous System, A - Electrical impulse, B - Sensory neuron, C - Motor neuron, D - Nerve ending
Neuromuscular junction, A - Cell body, B - Sensory neuron, C - Motor neuron, D - Axon
SOLUTION
Solution : A
The figure shown above represents the pathway of the impulse taken during a reflex action. The pathway is called reflex arc. The components of a reflex arc are:
A: Receptor: The receptor acts as a sensory organ and detects the external stimulus.
B: Sensory neuron: It takes the information detected by the receptor to the spinal cord. The spinal cord processes this information and gives a signal.
C: Motor neuron: It takes the signal from spinal cord to the effector organ.
D: Relay neuron: It connects the sensory neuron to the motor neuron.
The effector organ, in this case a muscle, does the action of pulling the hand away from hot pan.
Question 2
When your finger gets accidentally caught at the door, the pain message is sent to your brain through:
Sensory nerves
Motor nerves
Cerebellum
Cerebrum
SOLUTION
Solution : A
The pain message is sent to our brain through the sensory nerves. These nerves carry impulses from the sense organs to either the spinal cord or the brain. Motor nerves carry impulses from the brain and spinal cord to the muscle and glands. Cerebellum and cerebrum are parts of the human brain.
Question 3
Rearrange the following words and match them with their correct descriptions:
1. RAMSWIDF
2. GOOTESNER
3. HENIXOTYR
Description
(i) Hormone secreted in females at puberty.
(ii) Deficiency of growth hormone in childhood leads to this condition.
(iii) This hormone regulates carbohydrate, protein and fat metabolism in the body.
1-ii, 2-iii, 3-i
1-iii, 2-i, 3-ii
1-ii, 2-i, 3-iii
1-iii, 2-ii, 3-i
SOLUTION
Solution : C
The rearranged words are as follows:
1. DWARFISM
2. OESTROGEN
3. THYROXINE
- Dwarfism is a condition that occurs as a result of deficiency of growth hormone in childhood.
- Oestrogen is the hormone secreted in females at puberty. Oestrogen plays a role in the development of so-called female secondary sex characteristics, such as breasts, wider hips, pubic hair and armpit hair.
- Thyroxine is the hormone which regulates carbohydrate, protein and fat metabolism in the body. It plays a crucial role in heart and digestive function, metabolism, brain development, bone health and muscle control.
Question 4
Which one of the following pair is correctly matched?
Gibberellin – internodal elongation
Cytokinin – fruit ripening
Ethylene – apical dominance
SOLUTION
Solution : A
Gibberellins promote internodal growth. Auxin helps in apical dominance. Cytokinin brings about cell division and ethylene promotes ripening of fruits.
Question 5
Which one of the following is a hormonal disease/disorder?
Scurvy
Malaria
Diabetes
Tuberculosis
SOLUTION
Solution : C
Diabetes is caused by a deficiency of the pancreatic hormone insulin, which results in a failure to metabolize sugars and starch. Sugars accumulate in the blood and urine since they are not used by the cells due to lack of insulin.
Question 6
The curvature of shoot due to auxins during phototrophic movements occur:
SOLUTION
Solution : B
When growing plants detect light, a hormone called auxin, synthesised at the shoot tip, help the cells to grow longer. When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards light.
Question 7
The messages carried by a neuron is called:
Nerve code
Reflex arc
Nerve impulse
Brain signal
SOLUTION
Solution : C
∙ Nerve impulses are simply signals that are transmitted along nerve fibres (or neurons). It is the process by which neurons communicate with one another.
∙ The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of difference in electrical charges across the membrane of the neuron.
∙ Nerve impulses can travel very quickly because they are electrical impulses.
Question 8
The movement of plant part in the direction of light is:
SOLUTION
Solution : B
Phototrophic movement is the growth of a plant in response to light.
If the plant part grows towards light, it is called positive phototropism, and if the plant part grows away from light, it is called negative phototropism. The shoot of a plant shows positive phototropism and the root of a plant shows negative phototropism.
Question 9
When you touch a hot pan accidently, you pull your hand back immediately. Identify the stimulus in the above statement.
SOLUTION
Solution : A
In the given case, touching the hot pan is the stimulus and pulling the hand back is the response.
Question 10
Out of the following, what could be the reason for dwarfism?
SOLUTION
Solution : B
One of the main hormones produced by pituitary is the growth hormone. This hormone is responsible for growth of the body. Excessive secretion of growth hormone causes gigantism and lack of growth hormone in a developing child causes dwarfism.