Tissues — Science STD 9 — Question

When we increase the loudness of sound of a TV, the property of sound that changes is:

Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non-cellular structure called the:

1. Nonstratified layer.
2. Stratified membrane.
3. Basement membrane.
4. Fibroblast.

The velocity of a body moving with a uniform acceleration of 2m/sec2 is 10m/ sec.Its velocity after an interval of 4 sec is:

The main source of food is/ are:

Endothelium of the inner surface of blood vessels in vertebrates is formed:

The process of cross breeding two different varieties of crop plants each having a desire characteristic, is known as:

1. Selection
2. Hybridization
3. Crossing
4. Introduction

Which of the following is octa-atomic?

Rhythmic contraction and relaxation throughout life, are shown by:

Which kind of sound is produced in an earthquake before the main shock wave begins?

1. Ultrasound.
2. Infrasound.
3. Audible sound.
4. None of the above.

Percentage of total water found as fresh water is:

1. 46%
2. 32%
3. 16%
4. 2.5%