Chapter 4: Animal Kingdom
50 sample Animal Kingdom flashcard questions and answers for NEET-UG Biology - Class 11, laid out as a readable study sheet. Read them straight on this page, print them, or save them as a PDF using your browser's print dialog.
Showing 50 of 424 questions in this chapter — practice online or download the PDF above for the full deck.
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| Question | Answer |
|---|---|
| Why is classification important in the animal kingdom? | Classification helps in assigning a systematic position to newly described species. |
| Which fundamental features are used as the basis of animal classification? | Arrangement of cells, body symmetry, nature of coelom, and patterns of digestive, circulatory, and reproductive systems. |
| What level of organisation is seen in sponges? | Cellular level of organisation. |
| What is meant by cellular level of organisation? | Cells are arranged as loose cell aggregates with some division of labour among cells. |
| Which animals show tissue level of organisation? | Coelenterates. |
| What is tissue level of organisation? | Cells performing the same function are arranged into tissues. |
| Which phylum first exhibits organ level of organisation? | Platyhelminthes. |
| What is organ-system level of organisation? | Organs associate to form functional systems, each concerned with a specific physiological function. |
| Which animals exhibit organ-system level of organisation? | Annelids, Arthropods, Molluscs, Echinoderms, and Chordates. |
| What is an incomplete digestive system? | A digestive system with a single opening serving as both mouth and anus. |
| What is a complete digestive system? | A digestive system with two openings: mouth and anus. |
| What is an open circulatory system? | Blood is pumped out of the heart and directly bathes the tissues and cells. |
| What is a closed circulatory system? | Blood circulates through vessels such as arteries, veins, and capillaries. |
| What is asymmetry in animals? | Any plane passing through the centre does not divide the body into equal halves. |
| Which animals are mostly asymmetrical? | Sponges. |
| Define radial symmetry. | Any plane passing through the central axis divides the organism into two identical halves. |
| Which groups show radial symmetry? | Coelenterates, ctenophores, and echinoderms. |
| Define bilateral symmetry. | The body can be divided into identical left and right halves in only one plane. |
| Which animals exhibit bilateral symmetry? | Annelids, arthropods, and similar animals. |
| What are diploblastic animals? | Animals with two embryonic layers: ectoderm and endoderm. |
| What is mesoglea? | An undifferentiated layer present between ectoderm and endoderm. |
| What are triploblastic animals? | Animals with three germ layers: ectoderm, mesoderm, and endoderm. |
| What is coelom? | A body cavity lined by mesoderm. |
| What are coelomates? | Animals possessing a true coelom. |
| Name some coelomate phyla mentioned in the text. | Annelids, molluscs, arthropods, echinoderms, hemichordates, and chordates. |
| Which animals are pseudocoelomates? | Aschelminthes. |
| What are acoelomates? | Animals in which the body cavity is absent. |
| Give an example of an acoelomate group. | Platyhelminthes. |
| What is metameric segmentation? | External and internal division of the body into segments with serial repetition of at least some organs. |
| In which animal is metameric segmentation clearly seen? | Earthworm. |
| What is notochord? | A mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals. |
| What are chordates? | Animals possessing a notochord. |
| What are non-chordates? | Animals that do not form a notochord. |
| What is coelom? | The body cavity lined by mesoderm is called coelom. |
| Why is coelom important in classification? | Presence or absence of coelom is very important in animal classification. |
| What are coelomates? | Animals possessing coelom are called coelomates. |
| Name the coelomate groups mentioned in the text. | Annelids, molluscs, arthropods, echinoderms, hemichordates, and chordates. |
| What is pseudocoelom? | A body cavity not lined by mesoderm, with mesoderm present as scattered pouches between ectoderm and endoderm. |
| What are pseudocoelomates? | Animals possessing pseudocoelom. |
| Give an example of pseudocoelomates. | Aschelminthes. |
| What are acoelomates? | Animals in which the body cavity is absent. |
| Give an example of acoelomates. | Platyhelminthes. |
| What are triploblastic animals? | Animals in which the developing embryo has a third germinal layer, mesoderm, between ectoderm and endoderm. |
| Which groups are triploblastic according to the text? | Platyhelminthes to chordates. |
| What is segmentation? | External and internal division of the body into segments with serial repetition of some organs. |
| What is metamerism? | The phenomenon of metameric segmentation. |
| Which animal is given as an example of metameric segmentation? | Earthworm. |
| What is notochord? | A mesodermally derived rod-like structure formed on the dorsal side during embryonic development. |
| What are chordates? | Animals with notochord. |
| What are non-chordates? | Animals that do not form a notochord. |
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