Advertisements
Advertisements
प्रश्न
Fish breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to
विकल्प
take in oxygen from the air.
take in oxygen dissolved in water.
absorb nutrients present in water.
release waste substances in water.
उत्तर
take in oxygen dissolved in water.
Explanation:
Fish use gills for the exchange of gases. Gills are made up of a large number of filaments, richly supplied with thin blood vessels called capillaries. As water enters through the mouth it flows over the gills. The blood in the capillaries absorbs oxygen dissolved in water and gives out carbon dioxide into the water.
APPEARS IN
संबंधित प्रश्न
Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
Match the items in Column I with those in Column II:
| Column I | Column II | ||
| (a) | Yeast | (i) | Earthworm |
| (b) | Diaphragm | (ii) | Gills |
| (c) | Skin | (iii) | Alcohol |
| (d) | Leaves | (iv) | Chest cavity |
| (e) | Fish | (v) | Stomata |
| (f) | Frog | (vi) | Lungs and skin |
| (vii) | Tracheae |
Frogs breathe through their skins as well as their lungs.
The fishes have lungs for respiration.
Fill in the Following Blanks with Suitable Words:
Yeast Undergoes ___________ Respiration Whereas Amoeba Undergoes _________ Respiration.
Earthworms and frogs breathe through their skin because of which the skin of both organisms is
Mark the following statement as True or False. Correct the false statement.
Frogs can breathe through their skin as well as lungs.
Cockroaches breathe with the help of air tubes called ___________.
On average, an adult human being at rest breathes 15–18 times per minute. The breathing rate, however, may differ under different conditions. Arrange the following activities given in the box in order of increasing breathing rates and give a reason for your answer.
sleeping, cycling, brisk walking, watching T.V
Match the names of organisms in Column I with their organs of breathing given in Column II.
| Column I | Column II | ||
| (a) | Butterfly | (i) | Lungs |
| (b) | Earthworms | (ii) | Gills |
| (c) | Sparrow | (iii) | Spiracles |
| (d) | Fish | (iv) | Skin |
