NCERT Based MCQ with Explanation:
1. Which of the following exhibits the cellular level of organization?
(A) Annelida
(B) Porifera
(C) Arthropoda
(D) Mollusca
Explanation: Members of the phylum Porifera exhibit a cellular level of organization, where cells function independently without forming true tissues.
2. What type of body symmetry is found in most adult echinoderms?
(A) Bilateral
(B) Radial
(C) Asymmetrical
(D) None of the above
Explanation: Adult echinoderms exhibit radial symmetry, meaning their body can be divided into identical halves by multiple planes passing through the central axis.
3. Which phylum is characterized by a pseudocoelom?
(A) Annelida
(B) Platyhelminthes
(C) Aschelminthes
(D) Mollusca
Explanation: Aschelminthes (Nematodes) have a pseudocoelom, a body cavity not fully lined with mesoderm, unlike a true coelom.
4. In which of the following organisms is metamerism found?
(A) Earthworm
(B) Starfish
(C) Spongilla
(D) Planaria
Explanation: Metamerism is the segmentation of the body into a series of similar units, as seen in earthworms (Annelida).
5. Cnidoblasts, which are characteristic of Cnidaria, are used for what purpose?
(A) Digestion
(B) Defense and prey capture
(C) Locomotion
(D) Reproduction
Explanation: Cnidoblasts are specialized cells in cnidarians that contain nematocysts, used for defense and capturing prey.
6. Which of the following animals does not possess a notochord at any stage of development?
(A) Amphioxus
(B) Frog
(C) Spongilla
(D) Lamprey
Explanation: Spongilla, a member of Porifera, lacks a notochord, a feature found only in chordates.
7. What is the type of coelom found in Annelids?
(A) Acoelomate
(B) Pseudocoelomate
(C) Coelomate
(D) None of the above
Explanation: Annelids have a true coelom, which is a body cavity completely lined with mesoderm.
8. Which of the following is a distinguishing feature of echinoderms?
(A) Water vascular system
(B) Jointed appendages
(C) Chitinous exoskeleton
(D) Segmentation
Explanation: Echinoderms possess a water vascular system, which aids in locomotion, feeding, and respiration.
9. Which phylum includes organisms with an incomplete digestive system, where a single opening serves as both mouth and anus?
(A) Arthropoda
(B) Platyhelminthes
(C) Annelida
(D) Echinodermata
Explanation: Platyhelminthes have an incomplete digestive system with only one opening that functions as both the mouth and anus.
10. Which of the following organisms shows alternation of generations (Metagenesis)?
(A) Hydra
(B) Obelia
(C) Ascaris
(D) Octopus
Explanation: Obelia exhibits alternation of generations, with both polyp and medusa stages.
Science MCQ, Class 10th, Chapter-1, Chemical Reactions and Equations11. Which class of vertebrates is entirely ectoparasitic?
(A) Cyclostomata
(B) Chondrichthyes
(C) Osteichthyes
(D) Amphibia
Explanation: Cyclostomata includes ectoparasites like lampreys, which attach to fish and feed on their bodily fluids.
12. In arthropods, excretion occurs through which of the following structures?
(A) Nephridia
(B) Flame cells
(C) Malpighian tubules
(D) Green glands
Explanation: Malpighian tubules are the excretory organs in arthropods, particularly insects.
13. The presence of a mantle and a radula are characteristic features of which phylum?
(A) Annelida
(B) Mollusca
(C) Arthropoda
(D) Echinodermata
Explanation: Molluscs have a mantle and a radula (a rasping organ used for feeding).
14. Which of the following is an example of a diploblastic organism?
(A) Earthworm
(B) Planaria
(C) Hydra
(D) Starfish
Explanation: Hydra, a member of Cnidaria, is diploblastic, with two embryonic layers: ectoderm and endoderm.
15. Which of the following animals has an open circulatory system?
(A) Fish
(B) Earthworm
(C) Insects
(D) Mammals
Explanation: Insects, like other arthropods, have an open circulatory system, where blood is not confined to blood vessels.
16. Which of the following organisms lacks true tissues and organs?
(A) Coelenterata
(B) Porifera
(C) Mollusca
(D) Annelida
Explanation: Poriferans (sponges) lack true tissues and organs and have a simple cellular organization.
17. Which phylum includes organisms that exhibit radial symmetry in the adult stage but bilateral symmetry in the larval stage?
(A) Mollusca
(B) Arthropoda
(C) Echinodermata
(D) Platyhelminthes
Explanation: Echinoderms, like starfish, show radial symmetry in adults and bilateral symmetry in larvae.
18. Which of the following structures is unique to phylum Echinodermata?
(A) Tube feet
(B) Jointed appendages
(C) Parapodia
(D) Choanocytes
Explanation: Tube feet are a characteristic feature of echinoderms, used for movement and feeding.
19. In diploblastic animals, the two germ layers are separated by which of the following?
(A) Coelom
(B) Mesoglea
(C) Mesoderm
(D) Pseudocoelom
Explanation: In diploblastic animals, the ectoderm and endoderm are separated by a non-cellular layer called mesoglea.
20. Which phylum includes organisms with a chitinous exoskeleton?
(A) Echinodermata
(B) Annelida
(C) Arthropoda
(D) Mollusca
Explanation: Arthropods possess a tough, chitinous exoskeleton that provides protection and support.
21. Which of the following is the key feature of animals in the phylum Platyhelminthes?
(A) Radial symmetry
(B) Dorso-ventrally flattened body
(C) Segmentation
(D) Jointed appendages
22. Which class of vertebrates is known for having a cartilaginous endoskeleton?
(A) Cyclostomata
(B) Chondrichthyes
(C) Osteichthyes
(D) Amphibia
23. Which phylum exhibits a water transport or canal system?
(A) Coelenterata
(B) Ctenophora
(C) Porifera
(D) Platyhelminthes
24. Which of the following phyla is characterized by the presence of a proboscis, collar, and trunk?
(A) Echinodermata
(B) Hemichordata
(C) Arthropoda
(D) Chordata
25. Which of the following is an example of a metamerically segmented animal?
(A) Octopus
(B) Earthworm
(C) Starfish
(D) Hydra
26. Which animal is not part of phylum Annelida?
(A) Nereis
(B) Hirudinaria
(C) Planaria
(D) Pheretima
27. What is the primary characteristic feature of the phylum Ctenophora?
(A) Presence of choanocytes
(B) Presence of comb plates
(C) Metameric segmentation
(D) Jointed appendages
28. Which of the following organisms belongs to phylum Mollusca?
(A) Starfish
(B) Octopus
(C) Earthworm
(D) Hydra
29. Which of the following is a unique feature of chordates?
(A) Chitinous exoskeleton
(B) Dorsal, hollow nerve cord
(C) Jointed appendages
(D) Open circulatory system
30. Which phylum exhibits bioluminescence?
(A) Coelenterata
(B) Ctenophora
(C) Platyhelminthes
(D) Annelida
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