19 Apr 2022

Samacheer Kalvi 9th Science Book Back Unit 7 Term 1

Samacheer Kalvi 9th Term I Science Book Back Question and Answers – Unit 7:

Samacheer Kalvi 9th Standard New Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 9 New Syllabus 2021 to 2022 Book Back Ques & Ans solutions available for both English and Tamil Medium. Class 9 Science Book Term 1 Unit 7 – Living World of Animals – Diversity in Living Organism –Kingdom Animalia Answers/Solutions are provided on this page. 9th Std Science Book is of Term 1st, 2nd, 3rd, and consists of 9 Units in each Term. All 9 Units of Term 1st, 2nd, 3rd Science Book Back One, and Two Mark Solutions are given below.

Check Unit wise and  9th New Science Book Back Question and Answers Guide/Solutions PDF format for Free Download.English, Tamil, Maths, Science, and Social Science Book Back Questions and Answers available in PDF. Check Science – Physics, Chemistry, and Biology, Social Science – History, Geography, Civics, Economics below. See below for the Samacheer Kalvi 9th Science Book Back Unit 7 Term 1 PDF:

Samacheer Kalvi 9th Science Book Back Unit 7 Term 1 Solutions Guide PDF:

Science Subject 1 Mark and 2 Mark Solutions Guide PDF available below. Click the Download option to download the book back 1 Mark & 2 Mark questions and answers. Take the printout and use it for exam purposes.

Term – 1

Unit – 7


I. Choose the correct answer

1. Which is not an insect?
(a) House fly
(b) Bedbug
(c) Mosquito
(d) Spider

2. Find the group having only marine members
(a) Mollusca
(b) Porifera
(c) Coelenterata
(d) Echinodermata

3. Mesoglea is present in
(a) Porifera
(b) Coelenterata
(c) Annelida
(d) Arthropoda

4. Dysentery is caused by
(a) Entamoeba
(b) Euglena
(c) Plasmodium
(d) Paramecium

5. Which one of the following pairs is not a poikilothermic animal
(a) Fishes and Amphibians
(b) Amphibians and Aves
(c) Aves and Mammals
(d) Reptiles and mammals

6. Identify the animal having four chambered heart
(a) Lizard
(b) Snake
(c) Crocodile
(d) Calotes

7. Which is not a feature of chordates
(a) Green glands
(b) Sweat glands
(c) Sebaceous gland
(d) Mammary gland

8. The bilaterally symmetrical larvae which transform into radially symmetrical adult is
(a) Bipinnaria
(b) Trochophore
(c) Tadpole
(d) Polyp

9. The animal without skull is
(a) Acrania
(b) Acephalia
(c) Apteria
(d) Acoelomate

10. Choose the correct terms related for Hemichordate
(a) Vermiform, unsegmented, triploblastic, ciliary feeders
(b) Vermiform, segmented, triploblastic, ciliary feeders
(c) Vermiform, unsegmented, diploblastic, ciliary feeders
(d) Vermiform, unsegmented, triploblastic, filter feeders

11. Hermaphrodite organisms are
(a) Hydra, Tape worm, Earthworm, Amphioxus
(b) Hydra, Tape worm, Earthworm, Ascidian
(c) Hydra, Tape worm, Earthworm, Balanoglossus
(d) Hydra, Tape worm, Ascaris, Earthworm

12. Poikilothermic organisms are
(a) Fish, Frog, lizard, man
(b) Fish, Frog, lizard, cow
(c) Fish, Frog, lizard, snake
(d) Fish, Frog, lizard, crow

13. Crop, gizzard and air sacs are seen in
(a) Fish
(b) Frog
(c) Bird
(d) Bat

14. Excretory organ of tape worm is
(a) Flame cells
(b) Nephridia
(c) Body surface
(d) Solenocytes

15. Tube like alimentary canal is found in
(a) Hydra
(b) Earth worm
(c) Starfish
(d) Ascaris

16. During ecdysis which of the following is shed off
(a) Chitin
(b) Mantle
(c) Scales
(d) Operculum

17. Cephalization is related to
(a) Head formation
(b) Gut formation
(c) Coelom formation
(d) Gonad formation

II. Fill in the blanks

1. The excretory opening of Porifera is Osta or Osculum
2. The second largest phylum of animal kingdom is  Mollusca
3. In India National deworming day is observed on February 10th in India
4. Myotomes are seen in Fishes
5. The larvae of an amphibian is Tadpole
6. In birds the air sacs communicate with Bones
7. Placenta is the unique characteristic feature of Mammals
8. The binomial name of our National Bird is Pavo Cristus
9. Blue revolution is the rearing of Fishes and Prawns
10. In mammals testis are enclosed by 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
10. Cloaca is present in all vertebrates – True

IV. Match the following

PHYLUM                               EXAMPLES
(A) Coelenterata          – (i) Snail
(B) Platyhelminthes   – (ii) Starfish
(C) Echinodermata     – (iii) Tapeworm
(D) Mollusca                 – (iv) Hydra

Ans: A – iv; B – iii; C – ii; D – i

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.
a) A is correct and the R is wrong
b) R is correct and the A is wrong
c) Both A and R is correct
d) Both A and R is wrong

2. Assertion (A): The prochordates are grouped under Acrania.
Reason (R) : They have well defined cranium.
a) A is correct and the R is wrong
b) R is correct and the A is wrong
c) Both A and R is correct
d) Both A and 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?

S.No Tube feet False feet
1 Tube feet present in star fish Present in amoeba
2 Function

 Loco motion, respiration, sensory and food capturing

 Loco motion, food capturing
3 Permanent Temporary

7. Are Jelly fish and star fish similar to cat fish? Give reasons.

  • No, All the three organisms belong to different category.
  • Jelly fish 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 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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