Tag: zoology

Questions Related to zoology

In humans the alveoli are the functioning units of external respiration.

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
  • Alveoli are an important part of the respiratory system whose function is to exchange oxygen and carbon dioxide molecules to and from the bloodstream. 
  • Alveoli are tiny, balloon-shaped air sacs present at the very end of the respiratory tree and are arranged in clusters throughout the lungs.
  • A typical pair of human lungs contain about 480 million alveoli. Hence, In humans, the alveoli are the functioning units of external respiration.
So, the correct answer is 'True'.

Where does exchange of gases ($O _2$ and $CO _2$) take place in our lungs?

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Pleura

  2. Bronchi

  3. Alveoli

  4. Trachea

Show answer
Correct Option: C
Explanation:

The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli. The layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other. This barrier between air and blood averages about 1 micron  in thickness. Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.

So the correct option is 'alveoli'.

Read the given statements and choose correct answer :-
(i) Initial bronchioles are supported by incomplete cartilagenous rings.
(ii) In human lungs are solid and spongy.
(iii) Alveoli wall contains simple squamous epithelium and white fibrous connective tissue (iv) Lungs are covered by a single layered pleura

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Three statements are correct

  2. Three statements are incorrect

  3. Only two statements are correct

  4. None of them

Show answer
Correct Option: A
Explanation:
The lungs are the primary organs of the respiratory system in humans and
they are covered by a double layered pleura. They are a part of the lower respiratory tract that begins at the trachea and branches into the bronchi and bronchioles. In the main bronchi, hyaline cartilage forms an incomplete ring, giving a "D"-shaped appearance.  The respiratory or gas-exchange surface consists of millions of small sacs, or alveoli, lined by a simple squamous epithelium and white fibrous connective tissue. The lungs feel spongy because of the presence of millions of alveoli inside them. So, i, ii and iii statements are correct. 
So, the correct option is 'Three statements are correct'.

The area of inner surface of bronchiole is 

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. $1m^2$

  2. $10m^2$

  3. $100m^2$

  4. $1000m^2$

Show answer
Correct Option: B

Which of the following structures is NOT supported by incomplete cartilaginous rings?

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Trachea

  2. Secondary bronchi

  3. Terminal bronchioles

  4. Primary bronchi

Show answer
Correct Option: A

Respiratory structures in insects are called as

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Gills

  2. Skin

  3. Lungs

  4. Trachea

Show answer
Correct Option: D
Explanation:

Trachea is a respiratory organ of insects. It is made up of a system of branching tubes that deliver oxygen to the tissues and remove carbon dioxide from the tissues.

The narrowest and most numerous tubes of lungs are called as

zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

  1. Bronchi

  2. Alveoli

  3. Bronchioles

  4. Tertiary bronchi

Show answer
Correct Option: C
Explanation:

The lungs which form the main respiratory system is a pair of spongy, air-filled organs which is located on either side of the chest in the rib cage. The inhaled air passes through the trachea (windpipe) into the lungs through its tubular branches known as bronchi which further divide into numerous smaller tubes known as the bronchioles. 

Infective stages of malarial parasite is found in?

zoology diseases and hygiene diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Salivary glands of mosquito

  2. Intestine of mosquito

  3. Haemolymph of mosquito

  4. Stomach wall of mosquito

Show answer
Correct Option: A
Explanation:
  • The parasite which causes malaria, Plasmodium requires two different hosts a vertebrate intermediate host, such as a human, and an insect definitive host, also known as the vector i.e female Anopheles mosquito. 
  • When the mosquito bites humans it ingests blood cells containing gametocytes. The mosquito digests the blood cells, releasing the male and female gametes, which fuse together and burrow into the mosquito’s gut wall, where they mature inside oocysts.
  • After 8-15 days (depending on the species) the oocysts burst and sporozoites are released into the body cavity of the mosquito. From there, they travel to the salivary glands. when the mosquito bites these infective sporozoite enters the blood of the humans.
  • Hence sporozoites are the infective stages of the malaria parasite is found in salivary glands of the mosquito.
  • So, the correct answer is 'Salivary glands of mosquito'.

........... spreads malaria 

zoology diseases and hygiene diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Mosquitoes

  2. Locusts

  3. Mites

  4. Bed-bugs

Show answer
Correct Option: A
Explanation:

The plasmodium parasite is spread by female Anopheles mosquitoes, which are known as "night-biting" mosquitoes because they most commonly bite between dusk and dawn. If a mosquito bites a person already infected with malaria, it can also become infected and spread the parasite on to other people.

So the correct option is A.

Which of the following disease is caused by the bite of mosquitoes?

zoology diseases and hygiene diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Dengue fever

  2. Malaria

  3. Cholera

  4. Both A and B

Show answer
Correct Option: D
Explanation:
Dengue fever is transmitted by the bite of Aedes mosquito.
Malaria is transmitted by the bite of the female Anopheles mosquito. The mosquito takes blood meals. During this time it infects the healthy person with the parasite from the previously infected person. Hence mosquitoes act as vectors for the transmission of dengue and malaria.
Thus the correct answer is option D.