Answer:
The food digestion is completed in small
intestine. Duodenum brings semi-digested food, which receives bile juices (from
liver) and pancreatic juices (from pancreas). The fat is emulsified by bile
juices. Proteins, fats and carbohydrates are digested byenzyme of pancreatic
juice. (2)
(a) Trypsin acts on proteins to form
peptides.
(b) Lipase acts on fats to form
fatty acids and glycerol.
(c) Amylase acts on starch to
form sugars.
The intestinal walls have small
projections called villi. Each villus is richly supplied by blood vessels. The
villi increase the surface area of the intestinal walls to help in absorption of
absorbed food.
The success sentericus juice
completes the digestion process and food is absorbed to reachall cells of the
body by villi walls. (1)
Or
This process is called
transpiration. (1/2)
It is defined as the process of
loss of water in vapour form from the aerial parts (leaves) of the plant. (1)
Transpiration is important
because it helps ingenerating a pull for water and minerals upwards through
xylem. It also helps to maintain plant temperature.
The stomatal cells open or close
to regulate exchange of gases and transpiration in plants.
The opening and closing of
stomata is guidedby guard cells through the process of turgid and flaccid condition.
This turgid and flaccid condition of guard cells is due to osmosis (endosmosis
and exosmosis) i.e., when theguard cells take up water and become turgid, the
stoma opens and when guard cells lose water and shrink, it
closes. (2)
You need to login to perform this action.
You will be redirected in
3 sec