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Biology Mixed Test - 1

Description: Biology Mix Test - 1
Number of Questions: 25
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Tags: Biology Mix Test - 1 Phylum-Arthropoda Phylum Arthropoda Kingdom- Protista Classification of Unicellular Eukaryotic Organisms Phylum-Aschelminthes Phylum Aschelminthes Types of Circulation Types of Circulatory Pathways Circulatory System in Human Human Circulatory System
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Elytra is a pair of hardened wings in insects. It is used for

  1. only flying

  2. flying and protecting the hind wings

  3. protecting the insects from enemies

  4. protecting the hind wings

Show answer
Correct Option: D
Explanation:

Elytra are hardened forewings which protect the transparent hind wings.

Filaria is caused by a worm called

  1. Trichinella spiralis

  2. Wuchereria bancrofti

  3. Ancylostoma duodenale

  4. Enterobius vermicularis

Show answer
Correct Option: B
Explanation:

Wuchereria bancrofti is a nematode which infects the lymphatic system causing swelling of certain body parts in humans.

Which of the following statements is incorrect about the closed circulatory system?

  1. The blood flows through blood vessels.

  2. The blood flows very slowly in the vessels.

  3. Blood has high pressure in the vessels.

  4. The blood comes in direct contact with the tissues.

Show answer
Correct Option: B
Explanation:

The blood flows very fast in the vessels.

The most serious form of malaria is caused by

  1. Plasmodium ovale

  2. Plasmodium falciparum

  3. Plasmodium vivax

  4. Plasmodium malariae

Show answer
Correct Option: B
Explanation:

Plasmodium falciparum causes malignant malaria and has a high mortality rate.

Which of the following statements is true about veins?

  1. They are empty after the death of the animal.

  2. They do not collapse even after being cut.

  3. Their walls are thin and contain valves.

  4. Their blood flow is fast and intermittent.

Show answer
Correct Option: C
Explanation:

They have valves to prevent the back flow of blood.

Which of the following statements is not true about the open circulatory system?

  1. The blood flow is very fast.

  2. The blood pressure is very high.

  3. The blood flows through the sinuses.

  4. The blood never comes in direct contact with the tissues.

Show answer
Correct Option: C
Explanation:

Sinuses are open tissue spaces.

Which stage is absent in incomplete metamorphosis of insects?

  1. Egg

  2. Larva

  3. Pupa

  4. Naiads

Show answer
Correct Option: C
Explanation:

  Pupa is the stage in the life cycle of insects which undergo complete metamorphosis and is replaced by a form which is similar in many ways to adult form in case of incomplete metamorphosis and is called nymph.

Which of the following structures stimulates the ventricular systole?

  1. SA node

  2. AV node

  3. AV valve

  4. AV aperture

Show answer
Correct Option: B
Explanation:

It receives the impulse from SA node and directs it down the ventricles.

Which of the following statements about arteries is correct?

  1. They take blood from various body parts to the heart.

  2. They carry deoxygenated blood towards the heart.

  3. They carry blood with high pressure.

  4. They are located superficially.

Show answer
Correct Option: C
Explanation:

They circulate blood in the whole body. For this, the blood has high pressure.

In which of the following organisms is open circuation present?

  1. Toad

  2. Prawn

  3. Lizard

  4. Pigeon

Show answer
Correct Option: B
Explanation:

It is a crustacean with open circulation.

Which of the following statements is true about the lymphatic system?

  1. It can easily be observed.

  2. It is free at one end.

  3. It is thinner than blood capillaries.

  4. It has a uniform diameter.

Show answer
Correct Option: B
Explanation:

Its one end is joined to the lymphatic system while other is free.

Sleeping sickness in humans is transmitted by

  1. Anopheles mosquito

  2. Aedes mosquito

  3. Sand fly

  4. Tse tse fly

Show answer
Correct Option: D
Explanation:

Tse tse fly transmits sleeping sickness parasite called Trypanosome.

Which of the following organs will receive less blood during strenuous exercise?

  1. The brain

  2. The skin

  3. The muscles

  4. The lungs

Show answer
Correct Option: B
Explanation:

The skin receives less blood during heavy exercise.

Which of the following animals have incompletely four chambered heart?

  1. Fishes

  2. Amphibians

  3. Reptiles

  4. Birds

Show answer
Correct Option: C
Explanation:

They have incompletely four chambered heart.

Which of the following actions causes the 'lub' sound of heart beat?

  1. The closure of the semilunar valve.

  2. The opening of the semilunar valve.

  3. The closure of the AV valve.

  4. The opening of the AV valve.

Show answer
Correct Option: C
Explanation:

It produces the 'lub' sound of heart beat.

Which of the following biochemical changes is not likely to happen in a person exercising hard?

  1. Increase in glycogen

  2. Increase in ADP

  3. Increase in lactic acid

  4. Increase in carbon dioxide

Show answer
Correct Option: A
Explanation:

Stored glycogen will get consumed during exercise.

What is true about the AV node of the human heart?

  1. It conducts impulse very rapidly.

  2. It is highly contractile.

  3. It consists of modified muscle fibres.

  4. It is composed of modified nerve fibres.

Show answer
Correct Option: C
Explanation:

It has the muscle fibres which conduct the impulse.

Passing through which of the following structures will blood lose maximum O2?

  1. The tissue capillaries

  2. The alveolar capillaries

  3. The left atrium

  4. The arteries

Show answer
Correct Option: A
Explanation:

Tissues need oxygen for the respiration process.

Valves are not found in which of the following structures?

  1. Arteries

  2. Heart

  3. Veins

  4. Lymphatics

Show answer
Correct Option: A
Explanation:

They do not have valves in them.

The opening of aortic valve is initiated when

  1. auricles contract

  2. auricular pressure exceeds aortic pressure

  3. ventricles contract

  4. auricular pressure exceed aortic pressure

Show answer
Correct Option: D
Explanation:

This will be the stimulus for aortic valve to open, as the blood will move down the pressure gradient.

Which of the following arteries is observed to measure the blood pressure?

  1. The common carotid

  2. The branchial

  3. The aorta

  4. The external iliac

Show answer
Correct Option: B
Explanation:

It can be observed easily and it lies towards the inner side of the elbow.

As compared to artery, a vein has

  1. a thicker wall

  2. a narrower lumen

  3. more musculature

  4. less elastic tissue

Show answer
Correct Option: D
Explanation:

Veins have less elastic tissue than arteries.

The greater proportion of circulating blood is normally present in the

  1. heart

  2. large arteries

  3. large veins

  4. capillaries

Show answer
Correct Option: D
Explanation:

They have the highest amount of circulating blood for exchange with tissues.

In which of the following structures is the pulse rate lowest?

  1. Aorta

  2. Femoral artery

  3. Arterioles

  4. Capillaries

Show answer
Correct Option: D
Explanation:

They have the lowest pulse rate and exchange material with the tissue.

Match column A with B. Column A: Column B:

  1. SA node A. Accessory chamber
  2. Water circulation B. Right auricle
  3. Sinus venosus C. Tricuspid valve
  4. Right A-V aperture D. Sponges

  1. 1-B, 2-D, 3-A and 4-C

  2. 1-D, 2-B, 3-A and 4-C

  3. 1-B, 2-D, 3-C and 4-A

  4. 1-B, 2-A, 3-D and 4-C

Show answer
Correct Option: A
Explanation:

S A node is present in the right auricle.

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