Golden brown colour of diatoms is due to presence of__________?

Related Mcqs:

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

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

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

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

3. Diatoms stay afloat due to___________?

   A. Flagella
   B. Stored lpids
   C. Pseudopodia
   D. All of these

4. Diatoms belong to___________?

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

5. 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

6. Diatoms are found in__________?

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

7. Centric discoid form of diatoms is__________?

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

8. 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

9. The plant dye Henna imparts orangered colour to skin and hairs due to its reaction with which of the following?

   A. Lipids
   B. Carbohydrates
   C. Amino acids
   D. Protein and amino acids

   Submitted by: Rashid Mehmood

10. Blood does not clot in the blood vessels due to the presence of ___________?

    A. Thrombin
    B. Fibrinogen
    C. Heparin
    D. Prothrombin

    Submitted by: Malik Asghar Hussain