Archive | Question and Answers

The primary function of the leaves is to manufacture food by the process of photosynthesis. The leaves contain a green pigment called chlorophyll.

A leaf having a single or undivided blade is called a simple leaf. Where a compound leaf is one in which the leaf blade in broken up into a number of segments called leaflets.

The root performs many functions primary of which are:

The tap root system consists of a single main root called the primary root which gives out lateral branches.

Phanerogams are flowering or seed-bearing plants. They are the most advanced plants. They possess well-developed roots, stems, leaves and flowers.

Cryptogams are flowerless or seedless plants. These plants never bear flowers or seeds. They are lower plants with simpler body form. Many of these plants do not have distinct roots, stems or leaves.

Despite numerous similarities between plants and animals they show many differences.

All organisms have certain characteristics by which they can be differentiated from non-living things. Let us study the characteristics of living organisms.

All substances are made up fine particles. You have learnt that a particle of a substance contains all its properties. Such a substance can be an element or a compound.

All substances and materials are made up of mater. Anything that has mass and occupies space is called matter. Anything which we can see, touch, smell or taste is matter.

Man has made a great deal of progress. He has made buildings, roads, canals, etc. he has made machines. Machines are now dominating our lives.

Abiotic components of the environment consist of soil, water and air. The climatic factors like sunlight, temperature, rainfall, humidity, etc., are also a part of the Abiotic environment.

A grasshopper is eaten by a frog which gets eaten by a snake and the snake is eaten by eagle. Thus, in the biosphere, one living organism is eaten or consumed by the other.

The living things like plants and animals constitute the biotic environment.

The Greenhouse Effect is a warming of the atmosphere around the Earth. This happens when some gases (carbon dioxide, water vapor, ozone, methane, etc.,) in the atmosphere

The biosphere is unique to the planet Earth. It is a narrow zone where the lithosphere, hydrosphere and atmosphere come into contact with each other.