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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
Name one example of the animal which shows the following characteristics:
Star-shaped body:
Find the odd one out. Give reason.
sea urchin, starfish, brittle star, jellyfish
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.
______ has smallest number of organisms with maximum number of similar characters
Label a,b,c and d. given in Fig. 7.1 Give the function of (b)
Fill in the boxes given in Fig. 7.2 with appropriate characteristics/plant group (s)
Order is a number of related families having common characters placed in an order.
In the taxonomical hierarchy, the category below the level of order is ______.
Genus represents ______.
The taxonomic unit ‘Phylum’ in the classification of animals is equivalent to which hierarchical level in classification of plants.
