1. Answer : (d) Gymnosperms
Explanation: In the case of phanerogams (seeds bearing plants), i.e., the gymnosperms and angiosperms, seeds are produced after fertilisation. They contain embryo along with stored food. The stored food provides nourishment to the developing embryo.
2. Answer : (c) Dogfish
Explanation: Dogfish is referred to as true fish, amongst Dogfish, Jellyfish, Starfish, and Silverfish. Jellyfish is not listed as a fish as it does not meet the characteristics of being a fish. Recall that, A fish should have gills, fins, and a vertebra which is all lacking in a jellyfish.
3. Answer : (a) Wuchereria
Explanation: Elephantiasis is caused by parasitic worms that are spread by mosquitoes. There are three types of worms involved: Wuchereria bancrofti. Brugia malayi.
4. Answer : (c) flowers
Explanation: Pteridophytes do not have seeds or flowers either, instead they also reproduce via spores.
5. Answer : (c) Jointed legs
Explanation: The feature that is not a characteristic of protochordata is jointed legs and presence of a closed circulatory system. Jointed legs are found in arthropods and surely it is not found in protochordata.
6. Answer : (b) Coelenterata
Explanation: Coelentrates are multicellular, diploblastic, and acoelomate animals having tissue level of organization i.e., they lack true organs, mollusca, Arthropoda and Echinodermata have organ level of organization.
7. Answer : (a) Echinodermata
Explanation: Body wall of echinodermata is covered with spiny, hard, calcareous (calcium carbonate) plates (ossicles) that form a rigid or flexible endoskeleton.
8. Answer : (b) Mollusca
Explanation: Mollusca is one of the most diverse groups of animals on the planet, with at least 50,000 living species (and more likely around 200,000). It includes such familiar organisms as snails, octopuses, squid, clams, scallops, oysters, and chitons.
9. Answer : (c) Cilia
Explanation: Cilia are essential for the movement of paramecia. As these structures whip back and forth in an aquatic environment, they propel the organism through its surroundings.
10. Answer : (c) Syrinx
Explanation: At the point where the windpipe divides is situated the bird's sound-producing organ, a “voice box” called the syrinx. Humans have no syrinx but a larynx instead. The larynx is a cavity in the throat and contains our vocal cords.
11. Answer : (a) Clitellum
Explanation: A conspicuous dark band of glandular tissue termed clitellum covers segments in a mature worm. So, the earthworm has an unsegmented band in its body called clitellum.
12. Answer : (d) 3
Explanation: Appropriate organization of three germ layers—endoderm, mesoderm, and ectoderm—during gastrulation is essential for a developing embryo.
13.Answer : (a) Saprotrophs
Explanation: Saprotroph, also called saprophyte or saprobe, organism that feeds on nonliving organic matter known as detritus at a microscopic level.
14. Answer : (c) Filarial worms
Explanation: Lymphatic filariasis, commonly known as elephantiasis, is a painful and profoundly disfiguring disease. It is caused by infection with parasites classified as nematodes (roundworms) of the family Filariodidea that are transmitted through the bites of infected mosquitos.
15.Answer : (d) Aves
Explanation: Bird, (class Aves), any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from all other animals.
16. Answer : (a) Presence of notochord
Explanation: In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
17. Answer : (b) Kingdom, Phylum, Class, Order, Family, Genus, Species
Explanation: The current taxonomic system now has eight levels in its hierarchy, from lowest to highest, they are: species, genus, family, order, class, phylum, kingdom, domain.
18. Answer : (b) Protochordata
Explanation: Herdmania is a genus of ascidian tunicates in the family of Pyuridae.These are marine animals having few features of vertebrates.
19. Answer : (a) echinodermata
Explanation: Echinoderms are "spiny-skinned" invertebrate animals that live only in marine environments.
20. Answer : (a) Aves
Explanation: Aves are the class of vertebrates that are characterised by the presence of feathers and wings. All birds fall under this class. They have long hollow bones that help them to fly. The forelimbs are modified for flight.
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