Structural Organisation of Animals

Samacheer Book Back Questions And Answers For Science Standard 10 “Structural Organisation of Animals“

I. Choose the correct answer:
1. In leech locomotion is performed by
a) Anterior sucker
b) Posterior sucker
c) Setae
d) None of the above

2. The segments of leech are known as
a) Metameres (somites)
b) Proglottids
c) Strobila
d) All the above

3. Pharyngeal ganglion in leech is a part of
a) Excretory system
b) Nervous system
c) Reproductive system
d) Respiratory system

4. The brain of leech lies above the
a) Mouth
b) Buccal Cavity
c) Pharynx
d) Crop

5. The body of leech has
a) 23 segments
b) 33 segments
c) 38 segments
d) 30 segments

6. Mammals are _____ animals.
a) Cold blooded
b) Warm blooded
c) Poikilothermic
d) All the above

7. The animals which give birth to young ones are
a) Oviparous
b) Viviparous
c) Ovoviviparous
d) All the above

II. Fill in the blanks:
1. The posterior sucker is formed by the fusion of the _____ segments.
2. The existence of two sets of teeth in the life of an animal is called _____ dentition.
3. The anterior end of leech has a lobe-like structure called _____.
4. The blood sucking habit of leech is known as _____.
5. _____ separate nitrogenous waste from the blood in rabbit.
6. _____ spinal nerves are present in rabbit.

Answers:
1. last 7
2. diphyodont
3. anterior sucker
4. sanguivorous
5. kidney
6. 37 pairs

III. Identify whether the statements are True or False. Correct the false statement
1. An anticoagulant present in saliva of leech is called heparin.
2. The vas deferens serves to transport the ovum.
3. The rabbit has a third eyelid called tympanic membrane which is movable.
4. Diastema is a gap between premolar and molar teeth in rabbit.
5. The cerebral hemispheres of rabbit are connected by band of nerve tissue called corpora quadrigemina.

Answers:
1. False (Anticoagulant present in saliva of leech is called hirudin)
2. False (The vas deferens serves to transport the sperm)
3. False (The rabbit has a third eyelid called nictitating membrane which is movable)
4. False (Diastema is a gap between incisors and premolar in rabbit)
5. False (The cerebral hemispheres of rabbit are connected by a band of nerve tissue called corpus callosum)

IV. Match columns I, II and III correctly
Organs(I)                 Membranous(II)           Covering Location(III)
Brain                          pleura abdominal          cavity
Kidney                       capsule                           mediastinum
Heart                         meninges                      enclosed in thoracic cavity
Lungs                        pericardium                   cranial cavity

Answers:
Brain – meninges – cranial cavity
Kidney – capsule – abdominal cavity
Heart – pericardium – mediastinum
Lungs – pleura – enclosed in thoracic cavity

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