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Samacheer Kalvi 9th Science Books English Medium Animal Kingdom

Science : Chapter 17 : Animal Kingdom

I. Choose the correct answer

1. Which is not an insect?

  1. Housefly
  2. Bedbug
  3. Mosquito
  4. Spider

Ans; Spider

2. Find the group having only marine members

  1. Mollusca
  2. Porifera
  3. Coelenterata
  4. Echinodermata

Ans; Echinodermata

3. Mesoglea is present in

  1. Porifera
  2. Coelenterata
  3. Annelida
  4. Arthropoda

Ans ; Coelenterata

4. Dysentery is caused by

  1. Entamoeba
  2. Euglena
  3. Plasmodium
  4. Paramecium

Ans; Entamoeba

5. Which one of the following pairs is not a poikilothermic animal

  1. Fishes and Amphibians
  2. Amphibians and Aves
  3. Aves and Mammals
  4. Reptiles and mammals

Ans ; Aves and Mammals

6. Identify the animal having four chambered heart

  1. Lizard
  2. Snake
  3. Crocodile
  4. Calotes

Ans ; Snake

7. Which is not a feature of chordates

  1. Green glands
  2. Sweat glands
  3. Sebaceous gland
  4. Mammary gland

Ans ; Green glands

8. The bilaterally symmetrical larvae which transform into radially symmetrical adult is

  1. Bipinnaria
  2. Trochophore
  3. Tadpole
  4. Polyp

Ans ; Bipinnaria

9. The animal without skull is

  1. Acrania
  2. Acephalia
  3. Apteria
  4. Acoelomate

Ans ; Acrania

10. Choose the correct terms related for Hemichordate

  1. Vermiform, unsegmented, triploblastic, ciliary feeders
  2. Vermiform, segmented, triploblastic, ciliary feeders
  3. Vermiform, unsegmented, diploblastic, ciliary feeders
  4. Vermiform, unsegmented, triploblastic, filter feeders

Ans ; Vermiform, unsegmented, triploblastic, ciliary feeders

11. Hermaphrodite organisms are

  1. Hydra, Tape worm, Earthworm, Amphioxus
  2. Hydra, Tape worm, Earthworm, Ascidian
  3. Hydra, Tape worm, Earthworm, Balanoglossus
  4. Hydra, Tape worm, Ascaris, Earthworm

Ans ; Hydra, Tape worm, Earthworm, Ascidian

12. Poikilothermic organisms are

  1. Fish, Frog, lizard, man
  2. Fish, Frog, lizard, cow
  3. Fish, Frog, lizard, snake
  4. Fish, Frog, lizard, crow

Ans ; Fish, Frog, lizard, snake

13. Crop, gizzard and air sacs are seen in

  1. Fish
  2. Frog
  3. Bird
  4. Bat

Ans ; Bird

14. Excretory organ of tape worm is

  1. Flame cells
  2. Nephridia
  3. Body surface
  4. Solenocytes

Ans ; Flame cells

15. Tube like alimentary canal is found in

  1. Hydra
  2. Earth worm
  3. Starfish
  4. Ascaris

Ans ; Ascaris

16. During ecdysis which of the following is shed off

  1. Chitin
  2. Mantle
  3. Scales
  4. Operculum

Ans ; Chitin

17. Cephalization is related to

  1. Head formation
  2. Gut formation
  3. Coelom formation
  4. Gonad formation

Ans ; Head formation

II. Fill in the blanks

1. The excretory opening of Porifera is ______________

Ans ; Osta or Osculum

2. The second largest phylum of animal kingdom is ______________

Ans ; Mollusca

3. In India National deworming day is observed on ______________

Ans ; February 10th in India

4. Myotomes are seen in ______________

Ans ; Fishes

5. The larvae of an amphibian is ______________

Ans ; Tadpole

6. In birds the air sacs communicate with ______________

Ans ; Bones

7. Placenta is the unique characteristic feature of ______________

Ans ; Mammals

8. The binomial name of our National Bird is ______________

Ans ; Pavo Cristatus

9. Blue revolution is the rearing of ______________

Ans ; Fishes and Prawns

10. In mammals testis are enclosed by ______________

Ans ; Scrotalsacs

III. State whether true or false:

1. Canal system is seen in coelenterates. ( False )

2. Hermaphrodite animals have both male and female sex organs. ( True )

3. Nephridia are the respiratory organ of Annelida. – ( False )

4. Bipinnaria is the larva of Mollusca . ( False )

5. Balanoglossus is a ciliary feeder. ( True )

6. Fishes have two chambered heart. ( True )

7. Skin of reptilians are smooth and moist. – ( False )

8. Wings of birds are the modified forelimbs. ( True )

9. Female mammals have scrotal sacs. – ( False )

IV. Match the following

1. CoelenterataSnail
2. PlatyhelminthesStarfish
3. EchinodermataTape worm
4. MolluscaHydra

Ans : 1 – D, 2 – C, 3 – B, 4 – A

V. Understand the assertion statements. Justify the reason given and choose the correct choice:

1. Assertion (A): The hydra is a diploblastic organism.

Reason (R) : They have two germ layers.

  1. A is correct and the R is wrong
  2. R is correct and the A is wrong
  3. Both A and R is correct
  4. Both A and R is wrong

Ans ; Both A and R is correct

2. Assertion (A) : The prochordates are grouped under Acrania.

Reason (R) : They have well defined cranium.

  1. A is correct and the R is wrong
  2. R is correct and the A is wrong
  3. Both A and R is correct
  4. Both A and R is wrong

Ans ; A is correct and the R is wrong

VI. Give very short answers:

1. Define taxonomy?

It is the theoretical study of classification including its basic principles, procedures and rules.

2. What is nematocyst?

The tentacles of coelenterates animals like hydra, jelly fishes, bear stinging cells are called nematocysts. They are helpful in defense and used for capturing the prey.

3. Why coelenterates are called diploblastic animals?

The body wall of coelenterats are made up of two layers outer extoderm and inner endoderm. Hence it is known as diploblastic animals.

4. Which organism is called as friends of farmers? Why?

Earthworm is called as friends of farmers. By its bodily movements makes the soil loose and increases the water holding capacity and makes the soil ready for cultivation. The vermicast exreta of earthworm is a very good manure for the soil. Hence it is known as friends of farmer.

5. List the respiratory organs of amphibians?

The respiratory organs of amphibians are gills, skin bucco- pharynx and lungs.

6. Differentiate between tube feet and false feet?

Tube feetFalse feet
1 Tube feet present in starfishPresent in amoeba
2 Function
Locomotion, respiration, sensory and food capturing
Locomotion, food capturing
3 PermanentTemporary

7. Are Jellyfish and starfish similar to catfish? Give reasons.

  • No, All three organisms belong to different categories.
  • Jellyfish belongs to the phylum coelenterate.
  • Starfish belongs to the phylum Echinodermata.
  • Cat fish which is known keluthi belongs to the class Pisces or fish.

8. What is Acrania?

The prochordates do not have a cranium or skull they are referred to as Acrania (Eg.) Balanoglossus.

9. What are the sub-phylum of Prochordates?

The sub-phylum of prochordates are cephalochordate, hemichordate and urochordata.

10. Why are frogs said to be amphibians?

As frog lives both in the water and on land they are called as amphibians. The larva form of frog is aquatic.

11. What is the silver revolution?

Silver revolution is practice of raising poultry such as chickens, turkeys, ducks, geese as a sub category of husbandry for the purpose of farming meat or egg for food.

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