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

Show characteristics of protozoans, Q. What are the characteristics of prot...

Q. What are the characteristics of protozoans that make them resemble animals? Protozoans are unicellular beings with some related characteristics to animal cells. In compar

State the term - neuropsychological examination, State the term - Neuropsyc...

State the term - Neuropsychological Examination For a neuropsychological examination a battery of tests administered should include, at a minimum: Intelligence Tests

What are some examples of interspecific competition, What are some examples...

What are some examples of interspecific competition? Examples of interspecific competition are: the dispute between vultures, worms, flies and microorganisms for carrion and th

Male reproductive disorders-cryptorchidism, Cryptorchidism Cryptorchid...

Cryptorchidism Cryptorchidism or incomplete descent of testis or retention of testis in the abdominal cavity occurs in all domestic species but is seen most commonly in stalli

Explain the determination of hydrolysis, Explain the Determination of Hydro...

Explain the Determination of Hydrolysis Hydrolysis of calcium pantothenate in acidic medium produces  α,γ-dihydroxy-β,β-dimethylbutyrolactone, which reacts with hydroxylamine i

Treatment of diarrhoea, Treatment   Most cases of diarrhoea do not need...

Treatment   Most cases of diarrhoea do not need antibiotic therapy as the bacterial or parasitic organism are not isolated from most of the cases. However chemotherapeutics  ar

Cells, what are the buildings blocks of life?

what are the buildings blocks of life?

What is the physiological explanation for archaic method, In ancient Greece...

In ancient Greece the father of Medicine, Hypocrates, described a method of diagnosing diabetes mellitus by tasting the patient's urine. What is the physiological explanation for t

The human impact on the environment, put the following events in the most p...

put the following events in the most probable order. A. Dead algae decomposed by bacteria B.excess nitrate and phosphate discharge into rivers C. Fish die of suffocation D.bacteria

Concept of recombination frequency used in genetic mapping, How can the con...

How can the concept of recombination frequency be used in genetic mapping? The Genetic mapping is the determination of the location of the genes in a chromosome. Besides determ

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