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Structural Organisation Of Animals Book Back Questions 10th Science Lesson 13

10th Science Lesson 13

13] Structural Organisation Of Animals

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Leeches do not have ear, hence can sense vibrations through their skin. Leeches have 2 to 10 tiny eyes, which helps them to locate their food. Leeches can suck blood five times more than their body weight. It may take more than a year for the complete digestion and absorption of a full meal.

Blood letting is a technique of bleeding in a patient to remove toxic impurities from the body.

Medical value of Leech: Leeches are effective in increasing blood circulation and breaking up blood clots. It is surprising that they can be used to treat cardiovascular diseases. Biochemical substances derived from leech saliva are used for preparation of pharmaceutical drugs that can treat hypertension.

The pygmy rabbit was listed as a threatened species in Washington in 1990, because of decline in its population size and distribution due to habitat loss. In March 2003, the Columbia Basin Pygmy Rabbit was federally listed as an endangered species.

Choose the best answers:

1. In leech locomotion is performed by

(a) Anterior sucker

(b) Parapodia

(c) Setae

(d) Contraction and relaxation of muscles

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) Nervoussystem

(c) Reproductivesystem

(d) Respiratorysystem

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) 33segments

(c) 38segments

(d) 30segments

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

Fill in the blanks:

1. The posterior sucker is formed by the fusion of the ______________ segments.

  1. Last seven
  2. First seven
  3. First nine
  4. Last nine

2. The existence of two sets of teeth in the life of an animal is called __________________ dentition.

  1. Monodont
  2. Diphyodont
  3. Triodont
  4. None of the above

3. The anterior end of leech has a lobe-like structure called ______________

  1. Mouth
  2. Anus
  3. Sucker
  4. None of the above

4. The blood sucking habit of leech is known as __________________.

  1. Carnivorous
  2. Sanguivorous
  3. Herbivorous
  4. None of the above

5. ___________ _____ separate nitrogenous waste from the blood in rabbit.

  1. Nephrons
  2. Neurons
  3. Pleura
  4. None of the above

6. _________________ spinal nerves are present in rabbit.

  1. 34 pairs
  2. 35 pairs
  3. 36 pairs
  4. 37 pairs

State true or false. If false, correct the statement:

1. An anticoagulant present in saliva of leech is called heparin.

2. The vas deferens serves to transport the ovum.

3. Diastema is a gap between premolar and molar teeth in rabbit.

4. The cerebral hemispheres of rabbit are connected by band of nerve tissue called corpora quadrigemina.

Match columns I, II and III correctly:

Organs Membranous Covering Location
Brain Pleura Abdominal cavity
Kidney Capsule Mediastinum
Heart Meninges Enclosed in thoracic cavity
Lungs Pericardium Cranial cavity

Answers:

Choose the best answers:

1.None of the above 2. Metameres (somites) 3. Nervous System 4. Pharynx 5. 33 Segments 6.

  1. Warm blooded 7. Viviparus

Fill in the blanks:

1. Last seven 2. Diphyodont 3. Sucker 4. Sanguivorous 5. Nephrons 6. 37 pairs

True or False:

  1. False – The anticoagulant present in the saliva of the 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. True –
  5. False – The cerebral hemisphere of the rabbit is connected by a band of nerve tissue called Corpus callosum.

Match the following:

Organs Membranous Covering Location
Brain Meninges Cranial cavity
Kidney Capsule Abdominal cavity
Heart Pericardium Enclosed in thoracic cavity
Lungs Pleura mediastinum

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