Waxes, Biology

Assignment Help:

WAXES

  1. These are monoglyceride compounds.
  2. They are chemically inert (due to absence of double bonds) and insoluble in water.
  3. On heating they become soft and pliable.
  4. On cooling they turn hard and water resistant.
  5. Waxes are common water repellent and lubricant lipids of plants and animals.
  6. Most land plants possess wax as bloom over fruits and other soft organs. It is also a component of cuticle over leaf surfae for reducing transpiration.
  7. In floating leaves the upper surface is covered by wax in order to prevent wetting and closing of stomata present on the upper surface.
  8. Lanolin (= lanoline) or wool fat is a wax secreted by cutaneous glands in fur bearing animals for providing a protective water proof coating to fur.
  9. Similarly water proof coating of wax occurs over feathers, human skin and insect skeleton.
  10. Whale, which consumes plankton in large quantity, comes to store the same lubricating wax, spermaceti, used to be got form Sperm Whale. It is the hardest wax.
  11. Bees wax is secreted by worker bees from their abdominal glands for building honey combs. It is formed by esterification of palmitic acid with mericyl and hexacosyl alcoholes. It's chemical name is meyricyl palmitate.
  12. Candle wax is a mixture of paraffin was (from petropleum) and stearic acid.
  13. Cerumen or ear wax is secreted by modified sweat glands or ceruminous glands present in the ear canal. It lubricates ear drum. It's more secretion is ciruminosis.

Related Discussions:- Waxes

Define about the spectroscopy- colorimetry, Define about the Spectroscopy- ...

Define about the Spectroscopy- colorimetry? Spectroscopy, therefore, is the study of the absorption and emission of radiation by matter. Absorption Spectroscopy is usually used

Poisoning, Poisoning: Poisoning  is a common medical emergency  in chi...

Poisoning: Poisoning  is a common medical emergency  in childhood. In children under 5 years of  age essentially all poisoning are accidental. Nearly 75 per  cent  of  all poi

Life style modification in management of diabetes mellitus, Life style modi...

Life style modification in the management of diabetes mellitus All of us have our own way of living. It becomes a routine when we do things in the same way. But when one falls

Nursing diagnosis, Nursing Diagnosis Nursing diagnosis are judgemen...

Nursing Diagnosis Nursing diagnosis are judgements or conclusions reached by you after analyzing the data base that indicate a potential or actual human need that you as

Penetrating injury, Penetrating Injury Open pneumothorax (sucking c...

Penetrating Injury Open pneumothorax (sucking chest wound)  Hemothorax  Tracheobrochiaf injury  Pulmonary contusion  Mediastinal injury

Usefulness of bacteria in a natural environment, Give one example in each c...

Give one example in each case of the usefulness of bacteria in (a) a natural environment, (b) an industrial process.   (a) In a natural environment bacteria brin

All cells have ribosomes and protei, Select all that are true: Plants do no...

Select all that are true: Plants do not have mitochondria, they have chloroplasts to convert the sun's energy into chemical energy via photosynthesis and do not need to make ATP us

Transmission electron microscopy, Transmission electron microscopy: Ar...

Transmission electron microscopy: Around 1931-32 two German scientists. Knoll and Ruska. Invented transmission electron microscopy, and built the first transmission electron m

What is meant by the arch reflex, What is meant by the arch reflex? In ...

What is meant by the arch reflex? In some situations the movement of the skeletal striated muscles does not depend upon commands of the superior motor neurons, i.e., it is not

Animal kingdom/pisces, similarity between pisces & mammals about dirhynous ...

similarity between pisces & mammals about dirhynous condition......

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd