These are some PYQs (previous year questions) from the CBSE board for Class 10 Science, Chapter 6: Control and Coordination.
By practicing these questions, you will get an idea of what type of questions may appear in the examination.
Question 1:
Select out of the following a gland which does NOT occur as a pair in the human body.
(a) Pituitary
(b) Ovary
(c) Testis
(d) Adrenal
1 mark; CBSE 2024
Answer:
(a)
Question 2:
In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be:
(a) lifted ribs and curve/dome shaped diaphragm.
(b) lifted ribs and flattened diaphragm.
(c) relaxed ribs and flattened diaphragm.
(d) relaxed ribs and curve/dome shaped diaphragm.
1 mark; CBSE 2024
Answer:
(b)
Question 3:
Sensory nerve of a reflex arc carries information from the receptor cells to the
(a) spinal cord
(b) brain
(c) muscles of the effector organ
(d) bones of the receptor organ
1 marks; CBSE 2023
Answer:
(a)
Question 4:
(a) Name one gustatory receptor and one olfactory receptor present in human beings.
(b) Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.
Dendrite –> a –> b –> End point of Neuron
2 marks; CBSE 2017
Answer:
(a) Tongue / Nose.
(b) a is Cell body, b is axon
Question 5:
Define neuron. Name the parts of the neuron where:
a. information is acquired.
b. impulse must be converted into a chemical signal for onward transmission?
2 marks; CBSE 2016
Answer:
Neuron is a functional and structural unit of nervous system. These cells are specialised for conducting information via electrical impulses from one part of the body to another.
(a) dendrites
(b) end of axon.
Question 6:
Write two differences between the response of the plants and response of the animals to stimuli?
2 marks; CBSE 2015
Answer:
| Plants | Animals |
| No specific or specialized tissue present for conduction of information. | Specialised tissues are present in the body for conduction of information. |
| Plant cells change shape by changing the amount of water in them. | Specialised proteins are found in muscle cells which help in changing the shape. |
Question 7:
How does feedback mechanism regulate the hormone secretion?
2 marks; CBSE 2014
Answer:
The feedback mechanism controls how much and when hormones are released. For example, if there is too much sugar in the blood, the pancreas detects it and releases more insulin to help process the sugar. Conversely, if there is less sugar, the pancreas releases less insulin.
Question 8:
What is meant by hydrotropism? Give an example.
2 marks; CBSE 2013
Answer:
Hydrotropism is how plants respond to water. Plant roots move towards water, showing positive hydrotropism.
Question 9:
Tendrils encircle or coil around the object in contact with it. Elaborate.
2 marks; CBSE 2013, 2012, 2011
Answer:
Tendrils are touch-sensitive. When they touch something, the part that makes contact grows more slowly than the rest of the tendril. This difference in growth makes the tendril curl around the object and hold on to it.
Question 10:
Name the hormones secreted by the following endocrine glands and specify one function of each:
(a) Thyroid
(b) Pituitary
(c) Pancreas
3 marks; CBSE 2017
Answer:
a. Thyroid: Produces thyroxine, which helps regulate the metabolism of carbohydrates, fats, and proteins.
b. Pituitary Gland: Produces growth hormone, which controls growth and development.
c. Pancreas: Produces insulin, which helps lower blood sugar levels.
Question 11:
A cheetah, on seeing a prey moves towards him at a very high speed. What causes the movement of his muscles? How does the chemistry of cellular components of muscles change during this event?
3 marks; CBSE 2020
Answer:
When a cheetah spots its prey, it uses photoreceptors in its eyes to detect it, and this information is sent to its central nervous system. Neurons then carry this information to the rest of the body.
At the same time, the hormonal system is involved. The adrenal glands release adrenaline into the cheetah’s bloodstream, which triggers the fight-or-flight response.
This hormone speeds up the heart rate, increases breathing, boosts blood flow to the leg muscles, and causes the liver to release more glucose into the blood. These changes give the cheetah the energy it needs to run quickly.
Question 12:
a. Name the diseases by which a person is likely to suffer due to the deficiency of:
(i) iodine
(ii) insulin
b. How the timing of secretion and amount of hormone secretion are regulated in human system. Explain with example.
3 marks; CBSE 2013, 2012
Answer:
a.
(i) Goitre
(ii) Diabetes
b. Hormone release is controlled by feedback mechanisms. For example, if blood sugar levels increase, the pancreas detects this and produces more insulin. When blood sugar levels drop, the pancreas produces less insulin.
Question 13:
Give the function(s) of the following plant hormones:
a. Auxins
b. Gibberellins
c. Cytokinins
d. Abscisic acid
e. Ethylene
5 marks; CBSE 2015
Answer:
a. Auxins help cells grow longer, form roots, divide, and also support fruit growth.
b. Gibberellins encourage stems to grow longer, seeds to germinate, and flowers to bloom.
c. Cytokinins help seeds and buds start growing, delay leaf aging, and open stomata.
d. Abscisic acid causes leaves and fruits to fall.
e. Ethylene speeds up fruit ripening.
