The Fundamental Unit of Life — Science STD 9 — Question

Living organisms are used in:

1. Organic manure.
2. Biofertilizers.
3. Natural insecticides.
4. Pesticides.

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

Who proposed the concept of evolution?

1. Aristoltle.
2. Theophrastus.
3. Darwin.
4. Linnaeus.

Briefly explain main layers of the atmosphere.

Plasma membrane is:

1. Permeable
2. Selective permeable
3. Semipermeable
4. Impermeable

The cell wall of meristematic cell is made of:

1. Protein
2. Amino acid
3. Peptidoglycan
4. Cellulose