Question

Q-3: Attempt any two questions. All carry equalm arks,
(10x220)
a) ) Whata re two basic shapes ofl enses? Explain the
difference in their working with the help ofd iagrams. [6]
ii) Compare reversible reactions with irreversible chemical
reactions. Also give one example ofe ach.
14)
b) i) Briefly describe the different parts of the human digestive
system
171
Briefly discuss different types of pulley systems [3]
c) i) Identify the types ofr eaction shown below. Whati s
happening in both reaction? Give example for particular
reactions
[6]
B
A
1)
+
B
+
2)
B
A
A
141
[
ii) How does breathing occur in human beings?​

Answer 1

Answer:

Breathing includes inhalation and exhalation. inhalation is an active process. exhalation is a passive process.