Endosperm with chalazal haustorium, Biology

Assignment Help:

Endosperm with Chalazal Haustorium

In Grevillea robusta, a member of Proteaceae the endosperm is of the free nuclear type. The upper part of endosperm becomes cellular, whereas the lower part develops into a coenocytic, coiled worm-like structure called the 'vermiform appendage'. It serves as an aggressive haustorium, invades the chalaza1 tissue and transports nutrients to the main endosperm. The occurrence of a chalazal haustorium is also reported in several other plants viz. Macadamia thymifolia, Magnolia obovata, Iodinia rhombifolia etc.

The longest endosperm haustorium is found in Echinocystis lobata of the family, Cucurbitaceae. In Lomalia, besides the chalazal haustorium, numerous single-celled, finger-like projections arise from the cellular endosperm. These penetrate the nutritive nucellar tissue and help in increasing the absorptive surface of the endosperm.


Related Discussions:- Endosperm with chalazal haustorium

Digestive system of mammals, DIGESTIVE  SYSTEM OF MAMMALS The tube f...

DIGESTIVE  SYSTEM OF MAMMALS The tube from mouth up to anus is called alimentary canal. Alimentary canal of man is about 9 meter and rabbit is about 6 meter. Digestive

Define the protective of vitamin c role as an antioxidant, Define the Prote...

Define the Protective of Vitamin C role as an antioxidant? Vitamin C is a powerful antioxidant because it can donate a hydrogen atom and form a relatively stable ascorbyl free

Describe effects on the urinary system, Describe the effects on the urinary...

Describe the effects on the urinary system of drinking too much beer.

Why are vaccines used in the prevention of infections, Why are vaccines use...

Why are vaccines used in the prevention but not in the treatment of infections? Why can antivenom serums be used in prevention and treatment? Vaccines are not used in the treat

Circulation, Circulation, Respiration and Excretion of Asteroidea Aste...

Circulation, Respiration and Excretion of Asteroidea Asteroids depend upon the circulation of coelomic fluid for the transport of gases and some nutrients. The blood vascular

Abscission - effects of plant growth regulators, Abscission - Effects of Pl...

Abscission - Effects of Plant Growth Regulators Abscission of leaves and fruit is one of the more obvious characteristics of senescence. Leaves do not fall simply because they

Why red-green colour blindness is x-linked recessive, Red-green colour blin...

Red-green colour blindness is X-linked recessive. A woman with normal colour vision has a father who is red-green colour-blind. The woman has four sons, none of whom are colour-bli

Explain different photic energy frequencies, What is an example of a lab ex...

What is an example of a lab experiment that shows the variation of the photosynthesis efficiency in relation to different photic energy frequencies to which the reaction is exposed

Show extraembryonic membranes present in vertebrates, Q. What are the extra...

Q. What are the extraembryonic membranes present in vertebrates? The extraembryonic membranes that may be present in vertebrates are the yolk sac, the amnion, the placenta, the

Explain the classification of simple proteins, Explain the Classification o...

Explain the Classification of simple proteins? 1) Albumins: Proteins such as egg albumin and serum albumin are soluble in water and coagulable by heat. 2) Globulins: These p

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