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प्रश्न
Comment on the aquatic and terrestrial habits of amphibians.
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
Identify me.
Though I am multicellular, there are no tissues in my body. What is the name of my phylum?
Answer the question by choosing correct option.
Which special cells are present in the body of sponges (Porifera)?
According to the course of animal evolution, which phylum is at the lowest level?
Write a short note.
Collar cells
The skeletal framework of Porifera is ______.
Tissue organization can be seen in phylum Porifera.
Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect developments are the characteristics of phylum
Classification of phylum Porifera is primarily based on
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 |
Sponges have special cells present on their body, they are known as ______ cells.
