Login or Register for FREE!
Subelement Y7

YAM SCIENCE

Section Y7D

Phytochemistry

What is the primary carbohydrate stored in yam tubers?

  • Fructose
  • Correct Answer
    Starch
  • Cellulose
  • Sucrose
This question does not yet have an explanation! Register to add one

Tags: none

Which compound in wild yams has been studied for potential pharmaceutical applications?

  • Capsaicin
  • Caffeine
  • Gluten
  • Correct Answer
    Diosgenin
This question does not yet have an explanation! Register to add one

Tags: none

What gives purple yam (ube) its distinctive color?

  • Correct Answer
    Anthocyanin pigments
  • Synthetic dyes
  • Chlorophyll
  • Hemoglobin
This question does not yet have an explanation! Register to add one

Tags: none

Which toxic compounds must be removed from certain wild yam species before consumption?

  • Radioactive isotopes
  • Heavy metals
  • Correct Answer
    Alkaloids and saponins
  • Petroleum derivatives
This question does not yet have an explanation! Register to add one

Tags: none

What causes the skin irritation sometimes experienced when handling certain yam species?

  • Capsaicin
  • Correct Answer
    Calcium oxalate crystals
  • Petroleum residue
  • Microscopic thorns
This question does not yet have an explanation! Register to add one

Tags: none

What enzyme causes browning when some yam varieties are cut and exposed to air?

  • Amylase
  • Pepsin
  • Lactase
  • Correct Answer
    Polyphenol oxidase
This question does not yet have an explanation! Register to add one

Tags: none

Which of the following is an accurate description of the starch found in yam tubers?

  • Correct Answer
    A mixture of amylose and amylopectin
  • Pure cellulose
  • Simple glucose only
  • Identical to synthetic plastic
This question does not yet have an explanation! Register to add one

Tags: none

What process converts the starch in yams to sugars during cooking?

  • Oxidation
  • Ionization
  • Correct Answer
    Hydrolysis
  • Nuclear fission
This question does not yet have an explanation! Register to add one

Tags: none

Which mucilaginous substance gives mountain yam (Dioscorea japonica) its characteristic slippery texture when grated?

  • Petroleum jelly
  • Correct Answer
    Glycoprotein mannan
  • Silicon dioxide
  • Polyvinyl chloride
This question does not yet have an explanation! Register to add one

Tags: none

What happens to the starches in yams when they are refrigerated after cooking?

  • They evaporate completely
  • They convert to protein
  • They transform into vitamins
  • Correct Answer
    They undergo retrogradation (recrystallization)
This question does not yet have an explanation! Register to add one

Tags: none

Go to Y7C Go to Y8A