Human
body is made up of countless millions of cells. Food is needed to built up new
cells and replace the worn out cells. However, the food that we take must be
changed into substances that can be carried in the blood to the places where
they are needed. This process is called digestion.
The
first digestive process takes place in the mouth. The food we eat is broken up
into small pieces by the action of teeth, mixed with saliva, a juice secreted
by glands in the mouth. Saliva
contains digestive juice which moisten the food, so it can be swallowed easily.
From the mouth, food passes through the esophagus (the food
passage) into the stomach. Here, the food is mixed with the juices secreted by
the cells in the stomach for several hours. Then
the food enters the small intestine. All the time the muscular walls of the
intestine are squeezing, mixing and moving the food onwards.
In a
few hours, the food changes into acids. These are soon absorbed by the villi
(microscopic branch projections from the intestine walls) and passed into the
bloodstream.
1. What is
the text about?
A. The digestive system
B. The digestive juice
C. The method of the digestive system
D. The process of intestine work
E. The food substances
2. How can
we swallow the food easily?
A. The food changes into acids absorbed by the villi.
B. The food must be digested first through the process.
C. The food is directly swallowed through esophagus into the
stomach.
D. The food is mixed with the juices secreted by the cells
in the stomach.
E. The food we take must be changed into substances carried
in the blood to the places.
3. From the
text above, we imply that ….
A. a good process of digestive system will help our body
becoming healthier.
B. no one concerned with the process of digestive system for
their health.
C. the digestive system is needed if we are eating the food
instantly.
D. every body must conduct the processes of digestive system
well.
E. the better we digest the food we eat, the healthier we
will be.
4. “Human
body is made up of countless millions of cells.” (Paragraph 1) The phrase “made
up” means ….
A. Produced
B. Managed
C. Arranged
D. Completed
E. Constructed
What is
photosynthesis? Photosynthesis is a food-making process that occurs in green
plants. It is the chief function of leaves. The word photosynthesis means
putting together with light. Green plants use energy from light to combine
carbon dioxide and water to make sugar and other chemical compounds.
How is
the light used in photosynthesis?
The light used in photosynthesis is absorbed by a green
pigment called chlorophyll. Each food-making cell in a plant leaf contains
chlorophyll in small bodies called chloroplasts. In chloroplast, light energy
causes water drawn form the soil to split into hydrogen and oxygen.
What
are the steps of photosynthesis process? Let me tell you the process of
photosynthesis, in a series of complicated steps, the hydrogen combines with
carbon dioxide from the air, forming a simple sugar. Oxygen from the water
molecules is given off in the process. From sugar together with nitrogen,
sulphur, and phosporus from the soil-green plants can make starch, fat,
protein, vitamins, and other complex compounds essential for life.
Photosynthesis provides the chemical energy that is needed to produced these
compounds.
9. What step
after the hydrogen combines with carbon dioxide from the air …
A. Photosynthesis provides the chemical energy that is
needed to produced these compounds.
B. Water drawn form the soil to split into hydrogen and
oxygen.
C. Food-making process that occurs in green plants.
D. Phosporus from the soil-green plants can make starch,
fat, protein, vitamins, and other complex compounds essential for life.
E. Oxygen from the water molecules is given off in the
process.
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