Can anyone send me 5th std CBSC science 1st lesson
Answers
Answer:
iv)What does the boy sometimes do by mistake?
std 2
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Can anyone send me 5th std CBSC science 1st lesson
Explanation:
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Answer:
Q1. How did the ant know that the other ants were not from this group?
Answer: Animals also have different senses. They can see, hear, taste, smell and feel. By using these senses the ants could identify that the other ants were not from this group.
Q2. How did the guard ant recognize this ant?
Answer: By using its smelling sense the guard ant could recognize this ant.
Try this and write
Drop some sugar, jaggery or anything sweet on the ground. Wait until the ants come there.
Q1. How long did it take for the ants to come?
Answer: Within minutes the ants surrounded the dropped sweets.
Q2. Did one ant come first or a group of ants came together?
Answer: A single ant came first and then group of ants followed it.
Q3. What did the ants do with the food?
Answer: The ants carried away the food to its hole.
Q4. Where do they go from there?
Answer: The ants went back to its hole from there.
Q5. Do they move in a line?
Answer: Yes, one ant follows the other and hence goes in a line.
Now carefully, without harming the ants, block their path for a while with a pencil.
Q6. Now observe, how do the ants move?
Answer: Even after blocking their path, the ants climb up the pencil and move in a straight line.
Q7. Now can you guess why the ants behaved like that when you blocked their path?
Answer: As the ants move, they leave a smell on the ground. The other ants follow the smell to find the way. So when their path was blocked the ants tried to keep their path by following the smell.
Q8. Have you ever been troubled by mosquitoes? Just think, how do they know where you are?
Answer: Mosquitoes can sense the smell of a human body. They also find us by the smell of the sole of our feet and the heat of our body.
Q9. Have you seen a dog sniffing here and there? What do you think it is trying to smell?
Answer: Yes, we have seen a dog sniffing here and there. The dog is trying to find out if any other dog is nearby by using its smelling senses.
Write
Q1. In what ways do human beings make use of this special sense of smell of dogs?
Answer: Human beings make use of this special sense of smell of dogs to catch criminals, in search of explosives, recovery of stolen goods, etc.
Q2. When do you find your sense of smell helpful to you? List some examples. Like – to know by its smell that food has gone bad or that something is burning.
Answer: Other than smelling bad or burnt object, we can also sense the smell of perfume, fragrance of a flower, smell of sweat, soaps and detergents, etc.
Q3. Name the animals that you would be able to recognize only by their smell, without seeing them?
Answer: We can recognize animals like sheep, goat, cow, dog, cat, etc by their smell.
Explanation:
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