Consider the following statements. [2024]
A. Annelids are true coelomates.
B. Poriferans are pseudocoelomates.
C. Aschelminthes are acoelomates.
D. Platyhelminthes are pseudocoelomates.
Choose the correct answer from the options given below:
B only
A only
C only
D only
(2)
Annelids are true coelomates. In poriferans and platyhelminthes, the body cavity is absent, so they are called acoelomates. In aschelminthes, the body cavity is not lined by mesoderm; instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm, and thus they are called pseudocoelomates.
Match List I with List II. [2024]
| List I | List II |
| A. Pterophyllum | I. Hag fish |
| B. Myxine | II. Saw fish |
| C. Pristis | III. Angel fish |
| D. Exocoetus | IV. Flying fish |
Choose the correct answer from the options given below:
A-II, B-I, C-III, D-IV
A-III, B-I, C-II, D-IV
A-IV, B-I, C-II, D-III
A-III, B-II, C-I, D-IV
(2)
Pterophyllum - Angel fish
Myxine - Hag fish
Pristis - Saw fish
Exocoetus - Flying fish
Match List I with List II. [2024]
| List I | List II |
| A. Pleurobrachia | I. Mollusca |
| B. Radula | II. Ctenophora |
| C. Stomochord | III. Osteichthyes |
| D. Air bladder | IV. Hemichordata |
Choose the correct answer from the options given below.
A-IV, B-II, C-III, D-I
A-II, B-I, C-IV, D-III
A-II, B-IV, C-I, D-III
A-IV, B-III, C-II, D-I
(2)
Pleurobrachia is a member of Phylum Ctenophora. Radula is file-like rasping organ found in the members of Phylum Mollusca for feeding. The members of Phylum Hemichordata have a rudimentary structure in the collar region called stomochord. Air bladder is present in the members of Phylum Osteichthyes, which regulates buoyancy.
The following are the statements about non-chordates: [2024]
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post-anal tail is absent.
Choose the most appropriate answer from the options given below:
A and C only
A, B and D only
B, D and E only
B, C and D only
(3)
In non-chordates, gill slits are absent, and the central nervous system is ventral, solid, and double.
Select the correct statements. [2023]
(A) Platyhelminthes are triploblastic pseudocoelomate and bilaterally symmetrical organisms.
(B) Ctenophores reproduce only sexually and fertilisation is external.
(C) In tapeworm, fertilisation is internal but sexes are not separate.
(D) Ctenophores are exclusively marine, diploblastic and bioluminescent organisms.
(E) In sponges, fertilisation is external and development is direct.
Choose the correct answer from the options given below:
(A), (C), and (D) only
(B), (C), and (D) only
(A) and (E) only
(B) and (D) only
(2)
Platyhelminthes are triploblastic, acoelomate, and bilaterally symmetrical organisms. In sponges, fertilisation is internal, and development is indirect.
Match List I with List II. [2023]
| List I | List II |
| (A) Contractile vacuole | (I) Asterias |
| (B) Water vascular system | (II) Amoeba |
| (C) Canal system | (III) Spongilla |
| (D) Flame cells | (IV) Taenia |
Choose the correct answer from the options given below:
(A)-(IV), (B)-(III), (C)-(I), (D)-(III)
(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
The unique mammalian characteristics are: [2023]
Hairs, pinna, and indirect development
Pinna, monocondylic skull, and mammary glands
Hairs, tympanic membrane, and mammary glands
Hairs, pinna, and mammary glands
(4)
The unique mammalian characters are mammary glands (milk-producing glands), the presence of hair, and external ears or pinnae.
Select the correct statements with reference to chordates. [2023]
A. Presence of a mid-dorsal, solid, and double nerve cord.
B. Presence of a closed circulatory system.
C. Presence of paired pharyngeal gill slits.
D. Presence of a dorsal heart.
E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:
B, D, and E only
C, D, and E only
A, C, and D only
B and C only
(4)
Chordates possess a dorsal, hollow, single nerve cord, a closed circulatory system, paired pharyngeal gill slits, a ventral muscular heart, and are triploblastic and coelomate animals.
Exoskeleton of arthropods is composed of: [2022]
Cutin
Cellulose
Chitin
Glucosamine
(3)
The body of arthropods is covered by a chitinous exoskeleton.
In which of the following animals, digestive tract has additional chambers like crop and gizzard? [2022]
Corvus, Columba, Chameleon
Bufo, Balaenoptera, Bangarus
Catla, Columba, Crocodilus
Pavo, Psittacula, Corvus
(4)
The alimentary canal of birds has additional chambers, the crop and gizzard. Crop stores and softens the food, however, the gizzard helps in crushing and churning the food, e.g., Pavo, Psittacula, Corvus.
