Question

1. Which of the following is true about plant?
a) The design made by veins in a leaf is called leaf venation.
b) Net like design made by veins in a leaf are taproots.
c) Parallel veins in a leaf are fibrous root.
d) Above all the three.
2. Which of the following is a synthetic fibre?
(a) Silk (b) Nylon (c) Jute (d) wood​

Answer 1

Answer:

1) d) Above all the three.

2)(b) Nylon

Answer 2

Answer:

By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.