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प्रश्न
Comment on the aquatic and terrestrial habits of amphibians.
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उत्तर
- The transition from aquatic to terrestrial living is clearly indicated in Amphibian.
- They are the first vertebrates to live on land.
- Amphibians have dual adaptation to living in aquatic and land environments.
- The double life is called amphibious.
- In frogs, the hind limbs have webbed feet.
- The skin is moist and glandular usually without scale.
- Respiration is by gills, lungs, skin and pharyngeal region.
- The heart has three chambers, with two auricles and a single ventricle.
- Fertilization is external.
- The larva is a tadpole, which is metamorphoses into an adult.
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संबंधित प्रश्न
Which special cells are present in the body of sponges (Porifera)?
Through which hole the animals in this phylum give out water from their body?
True (or) False. If false write the correct answer.
Classification helps to know the origin and evolution of an organism
The skeletal framework of Porifera is ______.
A true body cavity is located within ______.
Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect developments are the characteristics of phylum
Match the column A with column B and choose the correct option
| Column I | Column II |
| A. Porifera | i. Canal system |
| B. Aschelminthes | ii. Water-vascular system |
| C. Annelida | iii. Muscular pharynx |
| D. Arthropoda | iv. Jointed appendages |
| E. Echinodermata | v. Metameres |
Fill up the blank spaces appropriately
| Phylum/Class | Excretory Organ | Circulatory Organ | Respiratory Organ |
| Arthropoda | Lungs/Gills/ Tracheal System | ||
| Nephridia | Closed | Skin/parapodia | |
| Metanephridia | Open | ||
| Amphibia | Closed | Lung |
Sponges have special cells present on their body, they are known as ______ cells.
Name the asexual reproductive structures of Sponges.
