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

Question: Differentiate between vertebrates and invertebrates.

Answer:

Question: Name the phylum of the following animals: (1) Tapeworm (2) Starfish (3) Jellyfish (4) Octopus

Answer:

1. Tapeworm – Flatyhelminthes
2. Starfish – Echinodermatai
3. Jellyfish – Coelenterata
4. Octopus – Mollusca

Question: Identify the phylum for the following characteristics given:
(a) Organisms with joint appendages.
(b) Organisms are generally flat worms.
(c) Body is segmented.
(d) Skin of organisms is full of spikes.

Answer:

1. Arthropoda
2. Platyhelminthes
3. Ann elida
4. Echinodermata

Question: State the features of all chordates.

Answer: All chrodates possess the following features:

1. Have a notochord
2. Have a dorsal nerve chord
3. Are triploblastic
4. Have paired gill pouches

Question: Give general characteristics of Porifera.

Answer:

1. Animals with pores all over the body.
2. Body is not well differentiated.
3. Non-motile animals, remain attached to solid support.
4.  Body is covered with hard outer skeleton. Example, sponges.

Question: How are pores or holes all over the body of Porifera important?

Answer: The pores or holes present all over the body of the organisms lead to a canal system that helps in circulating water throughout the body to bring in food and oxygen.

Question: Give general characteristics of ‘Platyhelminthes’?

Answer:

1. These are flat worms.
2. Most of them are parasites.
3. Animals are triploblastic
4. No true internal body cavity.
5. E.g., Tapeworm, planaria, Liver fluke.

Question: Give specific characteristics of Coelenterata.

Answer:

1. Water living animals.
2. Body is made of two layers of cells.
3. Some of them live in colonies (corals), while others have solitary life-span {Hydra).
4. Body cavity present.

Question: Give the characteristics of Arthropoda with 2 examples.

Answer:

Arthropoda means “jointed legs”.

1. Animals are bilaterally symmetrical and segmented.
2. It has an open circulatory system.
3. This is the largest group of animals.
4. Example: Spider, scorpionts, crabs, house flies.