1. Assertion -Eukaryotic cells have membrane-bound organelles.
Reason -Prokaryotic cells lack membrane-bound organelles .
2. Assertion -Tin cans, used for storing food, are made by electroplating tin on iron.
Reason -Tin is more reactive than iron. Thus,food does come in contact with iron and is protected from getting spoiled.
3. Assertion- In the summer season the frequency of watering is lower in plants. Reason- It is due to the increased rate of evaporation of water from the soil and the leaves.
4. Assertion - It is difficult to carry a bag with narrow straps as compared to carry the bag with broader straps.
Reason- When the same force acts over a small area its effect is more .
5. Assertion- A ball rolling along the ground gradually slows down and finally comes to rest.
Reason- This happens due to the force of friction between the ball and the ground.
6. Assertion- We apply water between the moving parts of a machine to increase the efficiency of the machine.
Reason - lubricants applied on the surface of the moving part reduces the friction.
7. Assertion - We do not slip when we walk on a wet floor.
Reason- The water forms a thin layer between the feet and the floor and decreases the friction.
8. Assertion- legumes revive the soil fertility.
Reason - Microbes in the root nodules of leguminous plants fix the atmospheric nitrogen and increase the fertility of soil.
9 Assertion -The bubbles of gas may be formed on the electrodes during chemical reaction .
Reason- The passage of an electric current through a conducting solution causes chemical reaction.
10. Assertion -The average temperature of the Earth's atmosphere is gradually increasing is called global warming .
Reason- The gasses like nitrogen oxide and water vapors also contribute towards the effect called greenhouse effect.
11. Assertion- Copper does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid.
Reason - Metals generally do not react with acids.
Posted by Ritvi Khandelwal
1 year, 2 months ago
Mahalaxmi Medi 1 year, 2 months ago
0Thank You