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

Related Mcqs:

1. Human skin colour is _________?

   A. Multifactorial
   B. Pleiotropic
   C. Polygenic
   D. Epistatic

   Submitted by: Muzaffar

2. Gram +ve bacteria on treatment with crystal violet dye give _________colour?

   A. red
   B. green
   C. purple
   D. pink

   Submitted by: Maryam Aftab

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 of the following impart a red colour to Rose petals?

   A. Chloroplast
   B. Chlorophyll
   C. Chromoplast
   D. Leucoplast

5. Which of the following pigment is Blue- green in colour?

   A. Chlorophyll a
   B. Chlorophyll b.
   C. Chlorophyll c
   D. Chlorophyll d.

6. Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called_____________________?

   A. Cofactor
   B. Coenzymes
   C. Activator
   D. Enzymes

7. If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________?

   A. Saturation
   B. Denaturation
   C. Composition
   D. Inhibition

8. An increrase in plant girth due to activity of _____________ is called secondary growth?

   A. Cork cambium
   B. Pith.
   C. Vascular cambium.
   D. Both a and c

9. Which one gives blue colour with iodine_______________?

   A. Starch
   B. Glycogen
   C. Cellulose
   D. Polysaccharide

10. Sweat glands occur in greatest number in the skin of the__________?

    A. Forehead
    B. Back
    C. Armpits
    D. Palm of hand

    Submitted by: Yaseen Nohri