Morphological nature of endosperm, Biology

Assignment Help:

Morphological Nature of Endosperm

The morphological nature of endosperm in angiosperms has been a subject of much discussion in evolution. The endosperm in gymnosperms is a gametophytic (haploid) tissue as it develops directly by the continued free nuclear divisions of the functional megaspore. In angiosperms, however, it develops from the primary endosperm nucleus which is normally formed by the fusion of two polar nuclei and a male nucleus and hence it is neither haploid nor diploid but generally triploid. Some workers have suggested that the endosperm in angiosperms is a gametophytic tissue just like those of gymnosperms, the only difference being that its development remains arrested till the entry of the pollen tube into the ovule.

Other embryologists have considered it as a second embryo or a maimed embryo. The most agreeable view regarding the morphological nature of the endosperm in angiosperm is that it is an undifferentiated tissue which shows different degrees of polyploidy. By suppressing the growth of the embryo in a seed, it has been possible to induce triploid shoot bud development in the endosperm. However, truly triploid plants have not been obtained so far.


Related Discussions:- Morphological nature of endosperm

What is the main biological process, Q. What is the main biological process...

Q. What is the main biological process that consumes carbon dioxide? The major biological process that consumes carbon dioxide is photosynthesis.

Transport through plasma membrane, TRANSPOR T THROUGH P.M. P.M. regula...

TRANSPOR T THROUGH P.M. P.M. regulates transport of materials in and outside of cell P.M. is semi- permeable as it allows rapid passage to water molecules. P.M. is selectively

Basic morphological features of echinoderms, Q. What are the basic morpholo...

Q. What are the basic morphological features of echinoderms? Echinoderms, as the name indicates (derma = skin, echino = spiny), are creatures with spines originated from an end

Types of organization chart, Types of Organization Chart: There are  t...

Types of Organization Chart: There are  two important  types of organization chart.  a)  Vertical i.e.,  from top to bottom.  b)  Horizontal  i.e., from  left to right.

Seed formation, Seed Formation A mature seed has seed coat, an embryo ...

Seed Formation A mature seed has seed coat, an embryo and reserve food material in the endosperm in monocots and in cotyledons in the dicots. Figure shows structure of dicots

Transport system in higher animals, Transport system in higher animals ...

Transport system in higher animals The circulatory system in higher animals has undergone several changes during evolution. The heart has become totally muscular. It p

State the term in brief -asconoid sponge, State the term in brief -Asconoid...

State the term in brief -Asconoid sponge? Of the three different sponge architectures, it is the simplest. It comrpsies a central choanocyte lined spongocoel which opens to the

Which equipments are required for stress laboratory, The stress lab must ha...

The stress lab must have the following equipment: 1) A mercury Blood Pressure apparatus. 2) A Bed so that the patients ECG can be recorded in the recovery period in supine po

Explain procedure for test of presence of coliform bacteria, Explain Proced...

Explain Procedure for the test of Presence of Coliform Bacteria? This test procedure is in continuation to the presumptive test procedure followed on last experiment. Now carry

Lymphatic drainage of the heart, The heart is drained by vessels that trave...

The heart is drained by vessels that travel in the interventricular and atrioventricular grooves. One set runs in the anterior part of the atrio-ventricular groove. The vessels of

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