Electricity — Science STD 10 — Question

In which asexual reproduction two individuals are formed from a single parent and the parental identity is lost? Draw the initial and the final stages of this type of reproduction to justify your answer. Write the event with which this process starts.

Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.

State Mendel’s first law of inheritance.

Why is a normal eye not able to see clearly the objects placed closer than 25cm?

When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name:

1. Substance oxidised, and
2. Substance reduced.

Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.

The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

1. How can you bend light away from the normal?
2. How must light travel out of a substance if it is not going to be refracted?

i. Why does a kitchen garden called an artificial ecosystem while a forest is considered to be a natural ecosystem?
ii. While designing an artificial ecosystem at home, write any two things to be kept in mind to convert it into a self-sustaining system. Give reason to justify your answer.

Write the balanced chemical equation for the following reaction and identify the type of reaction.
Sodium hydroxide solution is treated with acetic acid to form sodium acetate and water.