Exoskeleton of a marine snail is composed of________________?

Related Mcqs:

1. Which one of the following forms the blk of exoskeleton of an arthropod?

   A. Epicuticle
   B. Procuticle
   C. Ectocuticle
   D. None of these

2. Which of the following statement about an arthropod exoskeleton is incorrect?

   A. It permits gaseous exchange
   B. It contains joints, for the same purpose as present in human skeletal system
   C. It provides muscle attachment
   D. Like all the other types of exoskeleton, they lack sensation

3. The most important group of producers in marine ecosystem is of__________?

   A. Diatoms
   B. Euglenoids
   C. Dinoflagellates
   D. Brown algae

4. Most of the marine invertebrates are__________?

   A. Osmoconformers
   B. Osmoregulators
   C. Both depend upon the concentration of sea water
   D. None of these

5. Which of the following marine fishes are considered direct descendents of fresh water ancestors?

   A. Hagfish
   B. Jelly Fish
   C. Star Fish
   D. Bony fishes

6. Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.

   A. Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment
   B. Trimethyl alanine
   C. Ammonia
   D. Trimethylamine oxide

7. Most cell membranes are composed principally of ?

   A. DNA ad protein
   B. Protein and Lipids
   C. Protein and Chitin
   D. Protein and RNA

8. Centrioles are composed of ________ triplets of microtubules.

   A. 3
   B. 9
   C. 10
   D. 15

9. The cell wall of oomycetes is chiefly composed of___________?

   A. Chitin
   B. Cellulose
   C. Lignin
   D. Proteins

10. Flagella are composed of________?

    A. micro tubules
    B. micro filaments
    C. intermediate filaments
    D. glycoproteins

    Submitted by: Maryam Aftab