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प्रश्न
Amphibians do not have the following
पर्याय
Three chambered heart
Gills or lungs
Scales
Mucus glands
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उत्तर
Scales
Explanation -
Amphibians do not have scales, instead, their skin has mucous secreting glands.
Fish, along with reptiles, have hard protective scales on their skin for protection. The outer body of many fish is covered with scales, which are part of the fish’s integumentary system. The scales originate from the mesoderm (skin). One major characteristic of reptiles is the presence of scales composed of a protein called keratin. These scales form a waterproof barrier of the skin, which allows reptiles to exist away from water without the threat of dehydration. Amphibians use their skin as secondary respiratory surfaces. Their skin is permeable to water and gases and is lined by mucous.
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संबंधित प्रश्न
Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in the case of higher plants and animals on one hand and bacteria on the other:
Define and understand the following term:
Phylum
Find the odd one out. Give reason.
jellyfish, hydra, sea anemone, butterfly
Observe the figure and answer the questions given below.
a) To which phylum these organisms belong?
b) Name the substance with which their body is covered.
c) Name their organs of locomotion.
Which of the following is not a criterion for classification of living organisms?
You are provided with the seeds of gram, wheat, rice, pumpkin, maize, and pea. Classify them whether they are monocot or dicot.
Classify the following organisms based on the absence/presence of true coelom (i.e., acoelomate, pseudocoelomate and coelomate)
Spongilla, Sea anemone, Planaria, Liver fluke Wuchereria, Ascaris, Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.
Which one of the following belongs to the family Muscidae?
Match the following and choose the correct option:
| Column I | Column II |
| A. Family | i. Tuberosum |
| B. Kingdom | ii. Polymoniales |
| C. Order | iii. Solanum |
| D. Species | iv. Plantae |
| E. Genus | v. Solanacea |
Define a taxon.
