Diatoms stay afloat due to___________?

Related Mcqs:

1. Unlike other algae, diatoms do not readily decay due to___________?

   A. Nonliving cells
   B. Siliceous wall
   C. Mucilaginous wall
   D. Water proof cell

2. Diatoms belong to___________?

   A. Chrysophyta
   B. Bacillariophyceae
   C. Xanthophyceae
   D. Both A. and B.

3. Golden brown colour of diatoms is due to presence of__________?

   A. Mycoxanthin, mucoxanthin and myxoxanthophylls
   B. Alpha and beta carotenes and myxoxanthin
   C. Fucoxanthin, diatoxanthin, diadinoxanthin
   D. None of the above

4. Which one of the following is representing the group of diatoms?

   A. Pinnularia, Navicula, Cymbella, Melosira
   B. Euglenamorpha, Hedneria , Heteronema, Colacium
   C. Nostoc, Anabaena, Aulosira, Cylindrospermum
   D. Cochlodinium, Gymnodinium, Lenodinium, Peridinium

5. Diatoms are found in__________?

   A. Phytoplanktonic population
   B. Freshwater lakes and ponds
   C. Marine environment
   D. All of the above

6. Centric discoid form of diatoms is__________?

   A. Diplaneis
   B. Coscinodiscus
   C. Camphyloneiscus
   D. Stephanodis

7. The chloroplasts of diatoms and chrysophycean algae do not possess____________?

   A. Chloryphyllpigments
   B. Enzymes for photolysis
   C. Defined grana and stroma
   D. Carotenes with chlorophylls

8. Locomotion in diatoms is carried out with the help of__________?

   A. Valve
   B. Raphe
   C. Pseudopodium
   D. Cilia or flagella

9. The DNA fragments have sticky ends due to___________?

   A. Endonuclease
   B. Unpaired bases
   C. Calcium ions
   D. Free methylation

   Submitted by: Maria Aziz

10. Based on molecular data euglenoids are thought to be closely related to___________?

    A. Dinoflagellates
    B. Zooflagellates
    C. Protozoans
    D. Algae