(a) Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel ? Name the…
(a) Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel ? Name the component of blood which helps in this process and state how this component perform this function.
Solution
(a)
• Plugging of the leak in blood vessels prevents lowering of
the blood pressure / maintains the efficiency of the pumping
system.
• Platelets
• Help to clot the blood at the site of injury.
OR
(b)
(i) Plants have low energy needs because they have a large
proportion of dead cells in many tissues / Plants have
low energy needs as they do not move
(ii) Translocation of soluble products of photosynthesis from
leaves to other parts of the plant / It transports amino
acids and other substances to storage organs of roots,
fruits and seeds and to growing organs.
24 u = - 60 cm f = -30 cm
1 1
= –
𝑓 𝑣 𝑢
1
= –
– 30 𝑐𝑚 𝑣 – 60 𝑐𝑚
1
= –
𝑣 −30
−3
v = – 20 cm
=
60 𝑐𝑚 𝑣
Position of image is 20 cm from a concave lens.