Q4. Assertion: a hormone affects only its target tissues. Reason: its specific receptors are located in the target tissues only. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion (NCERT page 247).
Q5. What is formed when a hormone binds to its receptor?
A hormone-receptor complex, which leads to biochemical changes in the target tissue (NCERT page 247).
Q6. Name two steroid hormones.
Any two of cortisol, testosterone, estradiol and progesterone (NCERT page 248).
Q7. A hormone reaches two tissues, but only one responds. Must the other tissue have received no hormone?
No. It may lack a suitable receptor or the necessary signalling machinery. Delivery alone does not establish a direct hormonal response.