Nutrition in Animals — Science STD 7 — Question

Explain, with examples, why we find animals of certain kind living in particular climatic conditions.

During a science experiment, a student sets up a simple pendulum in the lab. She observes that the pendulum completes 40 complete oscillations in 80 seconds.
(i) Calculate the time period of the pendulum.
(ii) If the number of oscillations is doubled, but the total time also becomes double, will the time period change? Explain.

An electric cell is a portable source of electrical energy. The positive terminal of the electric cell is marked with a + sign, and the negative terminal is marked with a – sign.
Q.1. What is the terminal marked with a “+” sign called?
Q.2. What happens when an electric cell is connected to a circuit?
Q.3. Which terminal of the cell does the electric current flow from?

Last Sunday Girish’s mother, Priyanka was preparing the dinner in her kitchen for Girish and his father. Both of them were feeling so much hungry and they sat ideally on their respective chairs and having empty plates and spoons on their dinning table. They were shouting like a 5 years old child that they wanted the dinner so much eagerly in order to fulfil their stomach. At the sometime, Girish’s mother served the cooked food to both of them and the moment, when Girish was just about to eat the rice with the help of spoon, he noticed that the spoon has such a shining surface that it reflected the light rays incident on it.

1. Explain the importance of shining surface in the reflection of light.
2. Name the type of spherical mirror represented by the shining steel spoon.
3. Mention the values shown by Priyanka here towards her family.

A group of people were smoking cigarettes in a restaurant. The atmosphere was full of smoke. An old man sitting next to the group asked them to stop smoking while sitting in the premise or move out. They agreed to do so and promised not to repeat then mistake.Answer the following Questions.

1. Write any three hazards of smoking.
2. Can smoking also affect the person who does not smoke?
3. Do you support the group’s decision to not smoke in public or indiviually. What values do we understand from here.

Name the source from which litmus solution is obtained. What is the use of this solution?

What happens to the food in mouth and oesophagus of the digestive tract?

Explain the importance of understanding the properties of different materials, and how does this helps in everyday life?

Rahul noticed that when he chewed a piece of bread for a long time, it started tasting sweet. His teacher explained that it happens because enzymes in saliva start breaking down starch into sugar.
(i). Name the type of nutrient present in the bread.
(ii) What did Rahul notice after chewing bread for a while?
(iii) What helps in the breaking down of starch in the mouth?

What are the functions of the tongue in human body?