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

Cilia and flagella – protozoans, Cilia and Flagella – Protozoans Cilia...

Cilia and Flagella – Protozoans Cilia and flagella basically have a similar structure and distinction between the two on structural basis does not exist. There is a filament o

Define post-surgical nutrition support for chd patient, Define Post-surgica...

Define Post-surgical Nutrition Support for CHD Patient? Nutrition support should be started as soon as possible. If oral not possible, enteral nutrition support should be pr

How the blood sugar level is maintained at a stable level, Discuss how the ...

Discuss how the blood sugar level is maintained at a stable level in the well fed and fasting state In  the fed state, clearance of blood  glucose is mainly by  liver via gluc

Planning the nursing care for dysentry, Planning the Nursing Care   1) ...

Planning the Nursing Care   1) Maintain hydration and electrolyte balance.  2) Administer accurate and adequate antibiotics drugs.  3) Prevent the spread of infection.

Explain therapy of specific lipid disorders, Q. Explain Therapy of Specific...

Q. Explain Therapy of Specific Lipid Disorders? a) Very high LDL levels usually result from inherited disorders of lipoprotein metabolism and carry a high risk of premature at

Biological sickness of soil, what is biological sickness of soil and its ma...

what is biological sickness of soil and its management

Single stranded conformation polymorphism analysis, This is a broadly used ...

This is a broadly used screening technique that find several genomic mutations in wide number of samples, this technique finds sequence variations because of point mutations or oth

Small for gestational age & intrauterine growth retardation, Define Small f...

Define Small for Gestational Age and Intrauterine Growth Retardation? Small for Gestational Age (SGA) is defined as infants affected by intrauterine growth restriction (IUGR).

What is the difference between plasma membrane and cell wall, What is the d...

What is the difference between plasma membrane and cell wall? Plasma membrane and cell wall is not the similar thing. Plasma membrane, also called cell membrane, is the outer m

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