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

State the foot examination of a diabetic patient, State the Foot examinatio...

State the Foot examination of a diabetic patient Foot examination of a diabetic patient is very crucial in early detection and proper treatment of foot problems.  In every fol

What do you mean by hemichordata, Q. What do you mean by Hemichordata ? ...

Q. What do you mean by Hemichordata ? Hemichordates re vermiform (worm-like) animals which have few characters like those of the chordates, hence the name hemichordata (hemi :

What is excessive cantilever, Excessive Cantilever Cantilevers in impla...

Excessive Cantilever Cantilevers in implant dentistry are commonly used especially in the mandibular arch for edentulous patients receiving implant supported prosthesis. Cantil

Explain chymotrypsin, Chymotrypsin Chymotrypsin  is secreted in an ina...

Chymotrypsin Chymotrypsin  is secreted in an inactive form  'chymotrypsinogen',  which  is activated by  trypsin. Chymotrypsin  is specific  for  peptide  bonds containing unc

MOVE MENT.., difference btn massflow and pressure law

difference btn massflow and pressure law

Define muscular strength component for physical fitness, Define Muscular st...

Define Muscular strength component for physical fitness? It is the ability of a muscle to exert force for a brief period of time. Upper-body strength, for example, can be measu

What are the hormones produced by the testicles, What are the hormones prod...

What are the hormones produced by the testicles and the ovaries? The testicles make androgenic hormones, the major of them being testosterone. The ovaries make estrogen and pro

Anomalies related to oral cavity, Anomalies Related to Oral Cavity   Un...

Anomalies Related to Oral Cavity   Under these anomalies we will briefly discuss the cleft lip and cleft palate.  You must have seen and/or nursed a baby born with a cut on

What is population density, What is population density? Population dens...

What is population density? Population density is the relation among the number of individuals of a population and the area or volume they occupy. For instance, in 2001 the hum

What are the risks of migration, What are the Risks of migration Eg ...

What are the Risks of migration Eg Getting lost (blown off course or similar) and the effect of this when there is a limited fuel supply. Insufficient food to build

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