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Q311.
List-I (Symmetry)
List-II (Animal/Group)
(a) Mostly Asymmetrical
i) Coelenterates
(b) Radial Symmetry
ii) Annelids
(c) Bilateral Symmetry
iii) Sponges
iv) Adult Echinoderms
[Animal-Kingdom] [class-xi]
Correct option: A [ A ]
Remark: Sponges are mostly asymmetrical. Coelenterates, ctenophores and adult echinoderms show radial symmetry. Annelids, arthropods and platyhelminths exhibit bilateral symmetry.
Q312.
List-I (Feature)
List-II (Term)
(a) Rod-like structure, mesodermally derived
i) Coelom
(b) Body cavity lined by mesoderm
ii) Segmentation
(c) Body divided into segments externally and internally
iii) Triploblastic
(d) Embryo has a third germinal layer
iv) Notochord
[Animal-Kingdom] [class-xi]
Correct option: B [ B ]
Remark: Notochord is a mesodermally derived rod-like structure. Coelom is a body cavity lined by mesoderm. Segmentation (metamerism) is division into repeated segments externally and internally. Triploblastic: embryo has three germ layers (ectoderm, endoderm, mesoderm).
ii) Gills, book gills, book lungs, or tracheal system
(c) Amphibia
iii) Gills
(d) Hemichordata
iv) 6-15 pairs of gill slits
[Animal-Kingdom] [class-xi]
Correct option: B [ B ]
Remark: Cyclostomata: elongated body with 615 pairs of gill slits. Arthropoda: respiration via gills, book gills, book lungs or tracheal system. Amphibia: respiration via gills (larvae), lungs and moist skin. Hemichordata: respiration through gills.
Q315.
List-I (Phylum)
List-II (Circulatory System)
(a) Annelida
i) Open type
(b) Arthropoda
ii) Absent
(c) Hemichordata
iii) Closed type
(d) Platyhelminthes
[Animal-Kingdom] [class-xi]
Correct option: B [ B ]
Remark: Annelida: closed circulatory system. Arthropoda: open circulatory system. Hemichordata: open circulatory system. Platyhelminthes: circulatory system absent.
Q316.
List-I (Animal)
List-II (Feature)
(a) Trygon
i) Poisonous fangs (snake)
(b) Torpedo
ii) Poison sting
(c) Naja
iii) Stinging capsules (cnidoblast)
(d) Cnidaria
iv) Electric organs
[Animal-Kingdom] [class-xi]
Correct option: A [ A ]
Remark: Trygon (sting ray) possesses a poison sting. Torpedo (electric ray) has electric organs. Naja (cobra) has poisonous fangs. Cnidaria use cnidoblasts (stinging capsules) for defence and capturing prey.
Q317.
List-I (Group)
List-II (Body Division)
(a) Arthropoda
i) Head, muscular foot, and visceral hump
(b) Mollusca
ii) Proboscis, collar, and trunk
(c) Hemichordata
iii) Head, thorax, and abdomen
(d) Amphibia
iv) Head and trunk
[Animal-Kingdom] [class-xi]
Correct option: A [ A ]
Remark: Arthropoda: body divided into head, thorax and abdomen. Mollusca: head, muscular foot and visceral hump. Hemichordata: proboscis, collar and trunk. Amphibia: body divisible into head and trunk.
Remark: Placoid scales: characteristic of Chondrichthyes. Cycloid/ctenoid scales: found in Osteichthyes. Feathers: characteristic of Aves. Epidermal scales/scutes: typical of Reptilia.