Question

18. Which of the following statements is TRUE regarding organisms? A. Bioluminescence is a feature displayed in creatures referred to by the common name oysters B. A gelatinous extracellular matrix called scolex is the snail body special solid material C. The invaginable cylindrical proboscis with spines is a specialized structure in acanthocephalans D. All cnidarians are animals that live in environments such as inland rivers, streams and ponds E. Subclass Mya is a terrestrial animal group that exhibits crawling locomotion called squids are organisms that for their body configuration display radial symmetry E. Both A & D A. clams B. mosquitoes C. hydroids D. amoebas 20. On Earth for certain life forms, budding is the asexual reproductive method in A. Oligochaetes B. Acanthocephalans C. Trophozoites D. Arcellas E. Cnidarians 21. In animal life, one creature known commonly as the clam is classified specifically in 9 Genus Ciliophora D. Family Myidae E. Species viridis A. Class Demospongiae B. Subphylum Cubozoa( 22. In some aquatic environmental habitats, the "true jellyfishes" are categorized typically in A. Genus Volvox B. Class Scyphozoa C. Family Cestoda D. Order Stentor E. None of the above 23. Certain creatures called commonly hydras exhibit a special biologic process that is D. nematocyst discharge E. All of the above A. gemmulation C.ameboid motion B. sporogony

Answer 1

Q)ANSWER TO QUESTION 18 IS-

b. The invaginable cylindrical proboscis with spines is a specialized structure of acanthocephala.

EXPLANATION-

Acanthocephala is a parasitic worm which are commonly called as thorny headed worms, this is because they have proboscis which has numerous spines over it. They use it to protrude it into host tissue and for attachment purpose.

Other options are false because oysters do not show any kind of bio luminescence. Scolex is part of tapeworm and not a matrix. All cnidarians do live in aquatic environment but not mainly in freshwater.They live Predominantly in marine habitat not in ponds or streams. Mya is a genus which is a marine animal not a terrestrial animal.

Q)ANSWER TO QUESTION 19 is

C. Hydroids.

EXPLANATION-

Clams and mosquitoes show bi lateral symmetry and amoebas show asymmetrical symmetry.

Q)ANSWER TO QUESTION 19 IS-

E. Cnidarians

EXPLANATION-

Cnidarians show an asexual reproduction in which new offspring are produced from a part of an organism this is called as budding. This is shown by Cnidarians.

Q)ANSWER TO QUESTION IS 20 IS-

D. Family Myidae

Family Myidae are called as clams which are marine bivalve molluscs. They belong to PHYLUM- MOLLUSCS.