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Prepare a list of some animals that are found parasitic on human beings.

Class 11 Biology
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Match the following: (a) Operculum (i) Ctenophora (b) Parapodia (ii)Mollusca (c) Scales (iii)Porifera (d) Comb plates (iv)Reptilia (e) Radula (v) Annelida (f) Hair (vi)Cyclostomata and Chondrichthyes (g) Choanocytes 

Class 11 Biology
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Segmentation in the body is first observed in which of the following? (a) Platyhelminthes (b) Aschelminthes (c) Annelida (d) Arthropoda

Class 11 Biology
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Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?

Class 11 Biology
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What are the modifications that are observed in birds that help them fly?

Class 11 Biology
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How important is the presence of air bladder in Pisces?

Class 11 Biology
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”All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.

Class 11 Biology
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Water vascular system is the characteristic of which group among the following ? (a) Porifera (b) Ctenophora (c) Echinodermata (d) Chordata

Class 11 Biology
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What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?

Class 11 Biology
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What is the difference between direct and indirect development?

Class 11 Biology
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Distinguish between intracellular and extracellular digestion

Class 11 Biology
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How useful is the study of the nature of body cavity and coelom in the classification of animals?

Class 11 Biology
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