Question
How are cactus adapted to survive in a desert?
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Answer
A cactus is able to survive in the desert as it is adapted to the hot and humid conditions of the desert. To survive in a desert, the cactus has the following adaptations:
- It has long roots that go deep inside the soil for absorbing water.
- Its leaves are present in the form of spines to prevent water loss through transpiration.
- Its stem is covered with a thick waxy layer to retain water.
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Activity.
Take four lengths of electric wire with differently coloured plastic coverings. Remove a little of the plastic covering from each length of wire at the ends. This would expose the metal wires at the ends of each length. Fix the exposed parts of two wires to the cell and the other two of the bulb as shown in Fig. $(A)$ and Fig. $(B).$
You can stick the wires to the bulb with the tape used by electricians. Use rubber bands or tape to fix the wires to the cell.Now, connect the wires fixed to the bulb with those attached to the cell in six different ways as have been shown in Fig. $C$ $[(a)$ to $(f)].$
For each arrangement, find out whether the bulb glows or not. Write “Yes’ or ‘No’ for each arrangement in your notebook.
Now, carefully look at the arrangements in which the bulb glows. Compare these with those in which the bulb does not glow.
Can you find the reason for the difference?
→Take four lengths of electric wire with differently coloured plastic coverings. Remove a little of the plastic covering from each length of wire at the ends. This would expose the metal wires at the ends of each length. Fix the exposed parts of two wires to the cell and the other two of the bulb as shown in Fig. $(A)$ and Fig. $(B).$
You can stick the wires to the bulb with the tape used by electricians. Use rubber bands or tape to fix the wires to the cell.Now, connect the wires fixed to the bulb with those attached to the cell in six different ways as have been shown in Fig. $C$ $[(a)$ to $(f)].$
For each arrangement, find out whether the bulb glows or not. Write “Yes’ or ‘No’ for each arrangement in your notebook.
Now, carefully look at the arrangements in which the bulb glows. Compare these with those in which the bulb does not glow.
Can you find the reason for the difference?
Why is atmosphere called the place where exchange of gases in nature occurs?
Who all belong to the family of herbivores?
Mention the methods that can be used for the separation of the following mixtures:
- Wheat, sugar and husk
- Rice, gram and iron fillings
- Sand, Mack gram (urad) and husk.
Why are plastics harmful?
You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.
What do you mean by herbivores and carnivores animals?
What is the difference between conductor and an insulator? Explain with examples.
Discuss:
Is it possible to reduce the problems relating to disposal of garbage?
Is it possible to reduce the problems relating to disposal of garbage?
shows a magnetic compass. What will happen to the position of its needle if you bring a bar magnet near it? Draw a diagram to show the effect on the needle on bringing the bar magnet near it. Also draw the diagram to show the effect when the other end of the bar magnet is brought near it.?
