10 Assorted questions on Porifera.

It is a well noted trend that a lot of questions appearing for competitive medical exams are heavily imbibed from very old NCERT textbooks as well as out-of-syllabus. This series of questions are prepared keeping in mind the extra portions and one-words that frequently come up for the A.I.P.M.T. Prelims, Kerala P.M.T., J.I.P.M.E.R. and also for the A.I.I.M.S. Examinations. I hope this helps you to get some additional useful information.

Self evaluation M.C.Q. Examination:
One question carries 4 marks if correct. If wrong the examinee is awarded -1 marks. There will be no marks for unattempted questions.

Maximum Marks:40
Pass Marks :20
Total time :10 minutes

1. Sponges are proifers because their bodies have:
a. Spicules in skeleton
b. several pores
c. canal system
d. all of these

Ans: b

2. Sycan belongs to the group which are best described as:
a. Unicellular and acellular
b. multicellular without any tissue
c. multicellular without any gastrovascular system
d. multicellular having tissue organisation but no body cavity

Ans: b

3. The phyllum name porifera was coined by_______
a. Robert Grant
b. Robert Koch
c. Robert Brown
d. Robert Frost

Ans: a

4. The study of porifers is called___________
a. Poriferology
b. Sycology
c. Hexactinellidology
d. Parazoology

Ans: d

5. The closest approach to true tissue in sponges are:
a. Ostracoderms
b. Porocytes
c. Pinacocytes
d. Collar cells

Ans: c

6. Sponges of skeleton are made of
a. silicious spicules
b. calcreous spicules
c. spongin fibres
d. all the above

Ans: d

7. Which is the chief nitrogenous waste in sponges?
a. Ammonia
b. Uric acid
c. Urea
d. T.M.A.O.

Ans: a

8. What is(are) the name(s) of the single exit for Sponges?
a. ostia
b. osculum
c. ostiophore
d. both a and b

Ans: b

9. What is the common relation between Porifera and Protozoa?
a. Single cell
b. Cell aggregate
c. Intra cellular Digestion
d. Extra cellular Digestion

Ans: c

10. Name the poriferan larvae.
a. Parenchymula
b. Amphiblastula
c. both (a) and (b)
d. none of the above

Ans: c