Life Processes — Science STD 10 — Question

Give reasons:
Use of a mild base like baking soda provides relief on the area stung by honeybee.

Define the following in terms of gain or loss of hydrogen with one example:

1. Oxidation.
2. Reduction.

Describe the working of a hydrogen bomb.

‘‘It is a matter of chance whether a couple will give birth to a male child or a female child.’’ Justify this statement with the help of a flow chart showing the fusion of sex chromosomes.

State any three differences between the physical properties of metals and non-metals.

What is a spherical mirror? Distinguish between a concave mirror and a convex mirror.

Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.

1. Explain the terms:

1. Implantation.
2. Placenta.

2. What is the average duration of human pregnancy?

The end product of a process is ethanol and carbon dioxide with the release of energy. Name this process and write the pathway involved in the reaction.