5 Question Explanation Text
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.
1. What the product of photosynthesis …
A. Sugar
B. Food and O2
C. Root
D. Food
E. Branch
ANS : B. Food and O2
2. What are photosynthesis need …
A. Water, light, oxygen, worm
B. Soil, chlorophyll, sun, human
C. Bug, air, oxigen, food
D. Light, Carbon dioxide, humus
E. Candle, vitamins, hydrogen
ANS : D. Light, Carbon dioxide, humus
3. 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.
ANS : E. Oxygen from the water molecules is given off in the process.
The sense of taste is one of a person’s five senses. We taste with the help of taste-buds in the tongue.
There are four main kinds of taste: sweet, sour, salty, and bitter. All other tastes are just mixtures of two or more of these main types.
The surface of the tongue has more than fifteen thousand taste-buds (or cells). These are connected to the brain by special nerves which send the so-called ‘tastes messages.
When the tongue comes into contact with food of any kind, the taste-buds will pick up the taste. The nerves then send a message to the brain. This will make us aware of the taste. All this happens in just a few seconds.
There are four kinds of taste-buds, each of which is sensitive to only a particular taste. These four groups are located in different parts of the tongue.
The taste-buds for salty and sweet tastes are found round the tip of the tongue and along its sides. Sour tastes can be picked up only at the sides of the tongue. The taste-buds of the bitter taste are found at the innermost edge of the tongue. There are taste-buds at the centre of the tongue.
The senses of smell and sight can affect taste. The good smell of food increases its taste. Similarly, attractive colours can make food appear tastier and more delicious. If food does not smell good or is dull-coloured, it will look tasty and may not taste good at all.
Very hot or cold sensations can make the taste-buds insensitive. Food that is too hot or too cold, when placed in the mouth, will have no tastes at all.
4. We can taste any kind of food because of ……..
A. The good smell of food
B. The four main kinds of taste
C. The taste-buds in the tongue
D. The senses of smell and sight
E. The taste-buds round the tip of the tongue
ANS : C. The taste-buds is the tongue
5. The senses of smell and sight …….
A. Increase the taste of the food
B. Affect the taste of the food
C. Make food more delicious
D. Make the food look good
E. Make the food attractive
ANS : B. Affect the taste of the food

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