Light — Science STD 7 — Question

Explain two neutralisation reactions related to daily life situation.

Interpret why jewellery made from sodium would not be safe.

Describe the different methods of asexual reproduction. Give examples.

Why do we get instant energy from glucose?

On the basis of the following table, calculate the speed of the car between 9:00 AM to 10:00 AM time interval.
Table: Odometer reading at different times of the journey

Time (AM)	Odometer reading	Distance from the starting point
8:00 AM	36540 km	0 km
8:30 AM	36560 km	20 km
9:00 AM	36580 km	40 km
9:30 AM	36600 km	60 km
10:00 AM	36620 km	80 km

While playing in a park, a child was stung by a wasp. Some elders suggested applying paste of baking soda and others lemon juice as remedy. Which remedy do you think is appropriate and why?

Mary and Manoj were classmates and good friends. On turning 11, Mary developed a little bulge on the front of her neck. She visited the doctor who gave her medication and asked to take iodine-rich diet. Similarly, a bump developed on the front of Manoj’s neck when he turned 12. However, the doctor told him that it was a part of growing up. According to you, what could be the possible reason for advising Mary and Manoj differently?

How does the structure of sand and clay affect water seepage?

If cells are placed side by side, then how are the terminals of the cells connected?