Frogs respire through
1. Skin
2. lungs
3. buccal cavity
4. All of these

Which of the following is true
(1)Gills are used by most of the aquatic animals

(2)lungs are used by most of the terrestrial animals

(3)Mammals have a well developed respiratory system

(4)All of the above

The mechanism of breathing depends on animal’s
1. habitat
2. level of organisation
3. Both A and B
4. Body segmentation

Choose the wrong statement
(1)CO2 is the harmful molecule and released during catabolic reactions
(2)respiration will always require O2
(3)Breathing is a part of respiration
(4)All of the above

Which of the following is entirely made of cartilage?

1. Nasal septum

2. Larynx

3. Glottis

4. Trachea

Trachea divides into two right and left primary bronchi at the level of:

1. Seventh cervical vertebra

2. Third thoracic vertebra

3. Fifth thoracic vertebra

4. Seventh thoracic vertebra

How many external nostrils are present in human beings
1. 1
2. 2
3. 3
4. None of these

Nasopharynx opens through_________ of the larynx region into the trachea.
1. glottis
2. gullet
3. epiglottis
4. All of these

Which of the following is true about epiglottis
1. thin elastic cartilaginous flap
2. prevent food entry into larynx
3. Coughing occurs due to its improper movement
4. All of these

The common passage for food and air is
1. nasal passage
2. nasopharynx
3. oropharynx
4. pharynx