✓ Board-verified
Science · 2025 · 5 marks
CBSE 2025 · Region 5 · Set 1 · Q35
(A) (a) Analyse the given situations and interpret the possible reason for each: (i) Iodine deficiency in diet increases the possibility of a disease…
(a)
Analyse the given situations and interpret the possible reason for each :
(i)
Iodine deficiency in diet increases the possibility of a disease of swollen neck in a person.
(ii)
Some people in population may have very short heights (dwarfs).
(iii)
Thick facial hairs develop in boys at the age of $\displaystyle 10$-$\displaystyle 12$ years.
(b)
Explain two reasons which necessitate the need of chemical communication in multicellular organisms.
(a)
Differentiate between voluntary and involuntary action.
(b)
Define reflex action. With the help of a flow diagram, show the correct sequence of path of Nerve impulse from place of its ori in.
Marking-scheme solution
(A) (a)(i) Iodine is necessary for the thyroid gland to make thyroxin hormone, its deficiency causes goitre.
(ii) Deficiency of growth hormone in childhood causes dwarfism.
(iii) Secretion of testosterone during puberty in males.
(b) • Hormones or chemical compounds can potentially reach all cells of body steadily and persistently.
Hormones help to coordinate growth, development and responses to environment.
All Control and Coordination questions2025 question paperNCERT solutions: Control and CoordinationPractice Control and Coordination →
More from Control and Coordination
- Write the name and location of a hormone which helps a person to respond when chased by a dog. Mention the responses in the body which help him to…2024
- Assertion: In our actions of writing or talking, our nervous system communicates with the muscles. Reason (R): Cranial nerves and spinal nerves form…2025
- How is an electric impulse created in human nervous system? Identify the parts of a neuron which helps the nerve impulse to travel (i) towards the…2023
- (i) Define a reflex arc. Why have reflex arcs evolved in animals? Trace the sequence of events which occur, when you suddenly touch a hot object.…2024
- Identify an involuntary action from the following:2024
- Some plants like pea plants have tendrils which help them to climb up other plants. Explain how is it done. Name the plant hormone responsible for…2023
- How is brain protected in our body? A doctor finds in one of his patients that he is not maintaining a proper posture and balance of his body. State…2025
- Give reasons for the following: Adrenal gland is known as the stress gland of the body. Prenatal sex determination is banned in India. Vegetative…2026
CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.