Nucellus - seed, Biology

Nucellus - Seed

In a large majority of flowering plants the nucellus is gradually utilized by the endosperm or embryo. In leguminous seeds, for example, the nucellus degenerates completely. Sometimes, as observed in Euphorbia spp., nucellar cells near the micropyle (termed epistase) and chalaza (hypostase) survive longer and may even persist in the mature seed.

In the black pepper fruit the bulk of the volume is occupied by the persistent nucellus, which is also the chief food storage tissue (endosperm is relatively little). Such persisting nucellus in the seed is designated perisperm. In Daphniphyllum himalayense the seed has copious endosperm surrounded by perisperm, which is characterized by the presence of oil droplets and even protein crystals.

 

Posted Date: 1/23/2013 8:03:34 AM | Location : United States







Related Discussions:- Nucellus - seed, Assignment Help, Ask Question on Nucellus - seed, Get Answer, Expert's Help, Nucellus - seed Discussions

Write discussion on Nucellus - seed
Your posts are moderated
Related Questions
What is the relationship between the following scientific terms: hypothesis, a theory, and a natural law?

The AV node of a mammalian heart is destroyed. A. A depolarization in a cell in the left atrium will cause a depolarization of a cell in the left ventricle. B. The contracti

Define the Structure of Vitamins? For your convenience, however, we have given the structures of these vitamins here in the text. Look at Figure which illustrates the fat-solu

Which of the following statements is correct? A. Hemoglobin binds O2 cooperatively, while myoglobin does not. B. Myoglobin binds O2 cooperatively, while hemoglobin does not.

Creb binding protein (CBP) is a histone acetyl transferase (HAT) protein. What role does the  addition of acetyl groups to histones play during development? A. The addition of

can u show the different activities on the topic

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Management   In case of  small defects surgical treatment is not indicated because spontaneous closure may occur before one to two years of  age. Patient  is treated for conges

N A TURA L CONTROL OF POPULATION GROWTH - 1 .       Biotic potential - It is capacity of population to increase its number by reproduction. For all animals, it is v

The cell membrane is a slim semi-permeable membrane which surroundings the cytoplasm of a cell. Membrane function is to defend the integrity of the interior of the cell by allowing