9th Class (CBSE) Science: Diversity in Living Organisms

Question: Give the characteristic features of Echinodermata.

Answer:

1. Spikes present on skin.
2. Free living, marine animals.
3. Triploblastic and have a coelomic cavity.
4. Have a peculiar water driven tube system used for moving around.
5. Have hard calcium carbonate structure that is used as a skeleton.
6. Example: Starfish, sea-urchin.

Question: Give the characteristics of mammals.

Answer:

1. Mammals are warm-blooded animals.
2. Four-chambered heart.
3. Mammary glands for production of milk to nourish their younger one.
4. Skin has hairs, sweat glands and oil glands.
5. Most of them produce their young ones (viviparous).

Question: What are the conventions followed for writing the scientific names?

Answer: The conventions followed while writing the scientific names are:

1. The name of the genus begins with a capital letter.
2. The name of the species begins with a small letter.
3. When printed, the scientific name is given in italics.
4. When written by hand, the genus name and the species name have to be underlined separately.

Question: Differentiate between algae and fungi

Answer:

Algae:

1. Contain chlorophyll (green in colour).
2. Autotrophic nutrition.
3. Food is stored in the form of starch.

Fungi:

1. Do not contain chlorophyll (non-green).
2. Heterotrophic nutrition.
3. Food is stored in the form of glycogen.

Question: Name the phylum of the following organisms, whose exclusive characteristics is given below: (a) Hollow bones (b) Jointed appendages
(c) Flat worm (d) Round worms, parasitic
(e) Soft body, muscular marine animal (f) Radially symmetrical, spiny skin.

Answer:

1. Phylum chordata, subphylum—vertebrata, class—Ave’s
2. Phylum—Arthropoda
3. Phylum—Platyhelmithes
4. Phylum—Aschelminthes
5. Phylum—Mollusc
6. Phylum—Echinodermata

Question: Give the characteristibs of amphibians.

Answer: Amphibians are vertebrates that lives on land and in water.

1. They are cold-blooded.
2. Heart is three-chambered.
3. Fertilisation is external.
4. Respiration through lungs on land and through moist skin when in water. Example, Frog, Toads

Question: Give the characteristics of Aves.

Answer:

1. Aves / birds can fly.
2. Streamlined body.
3. Hollow and light bones.
4. Forelimbs are modified into wings.
5. Warm-blooded animals, heart with four chambers.
6. Egg laying animals.
7. Beak present, teeth are absent.