DIVERSITY OF ORGANISMS

Q.1 Estimates of the total number of species on Earth range from as low as 3 to 5 million to around _____ million.

Ans. 100

This wide range of organisms is described as diversity of organisms.

Q.2 Try to match the following organisms with the place where they live.

1. Shrimp A. rocky store2. Mushroom B. desert3. Penguin C. polar region4. Camel D. woodland5. Hermit crab E. river

Ans. 1-E 2-D 3-C 4-B 5-A

The place or natural environment where each type of organism lives is called its habitat.

•To help identify and study organisms, biologists sort/classify them into groups

•Organisms are classified into two groups: animals and plants.

Sorting organisms into groups is called classification.

Q.3 What is the main difference between them?

(Hints: consider their ways of obtaining food)

Ans. Plants make their own food but animals feed on others.

•Animals are further classified, according to other features, into 2 groups:

•Plants are also classified into 2 groups:

vertebrates (animals with backbones)

invertebrates (animals without backbones)

flowering plants

non-flowering plants

Classification of Animals

Fish Amphibian Reptile Birds M ammals

vertebrates(with backbone)

invertebrates(without backbone)

Animals

Classification of Plants

Algae Fungi M osses Ferns Gymnosperms

Non-flowering plants

Angiosperms

Flowering plants

Plants

You Should Be Able to:

6. Use an identification key.

1. Point out that there is a large variety of living things.

2. Classify animals into vertebrates and invertebrates.

3. Classify vertebrates into fishes, amphibians, reptiles, birds and mammals.

4. Classify plants into flowering and non-flowering plants using external features.

5. Classify non-flowering plants into algae, fungi, mosses, ferns and gymnosperms.

Prepared by

Fok Ping Chiu 97055670Leung Kin Lap 97100880Pang Oi Yan 97055830Tong Cho Shun 97054760Wong Siu Kit 97054500

Course : EDD 5161R