Nucellus - ovule, Biology

Assignment Help:

Nucellus - Ovule

Enclosed within the integuments lies a homogenous mass of tissue which is termed as the nucellus. This is the tissue in which the female gametophyte differentiates and develops. At an early stage of ovule development, usually an archesporial cell or a group of cells differentiate in the hypodermal region of the nucellus. The archesporial cell may function directly as the sporogenous cell. In such situations, the sporogenous cell also remains hypodermal in position and is surrounded by a single-layer of nucellus, in the micropylar region. Such ovules are known as tenuinucellate. These are commonly seen in Sympetalae.

405_Nucellus.png

Figure: Tenuinucellate ovule of Elytraria acaulis. In c and d integuments are not shown.


Related Discussions:- Nucellus - ovule

Explain adverse effects of bronchospasm, Adverse Effects of Bronchospasm ...

Adverse Effects of Bronchospasm Nasal and throat discomfort can occur. Bronchospasm, sometimes severe, has been reported uncommonly in patients with reactive airway disease; za

Cytogenetics, describe five features of chromosomes used in cytogenetic ana...

describe five features of chromosomes used in cytogenetic analysis?

What is the scientific means about cat and mouse, Toxoplasma cycles between...

Toxoplasma cycles between its rodent and feline hosts, living out different phases of its existence in each. What is the scientific means about the cat and mouse?

Photosynthetically active radiation, Photosynthetically Active Radiation ...

Photosynthetically Active Radiation This is usually in direct proportion with the incident solar radiation, you know that tropic$ are probably the best illuminated part of the

Explain spoilage of cereals and cereal products, Q. Explain Spoilage of Cer...

Q. Explain Spoilage of Cereals and Cereal Products? Cereals are the main source of energy to human beings. There are several varieties of cereals, of which wheat and rice are t

Illustrate erythropoietin, Define Erythropoietin A. acts by stimulating...

Define Erythropoietin A. acts by stimulating the production of red blood cells by the peritubular interstitial cells of the kidney cortex. B. is secreted by cells in the bon

Fishes- regeneration in vertebrates, Fishes- Regeneration in Vertebrates ...

Fishes- Regeneration in Vertebrates Several different parts of the fish body will re-grow. Plucked scales are promptly replaced by new ones and amputated gill filaments can re

How do cam plants vary from both c3 and c4 plants, How do CAM plants vary f...

How do CAM plants vary from both C 3 and C 4 plants? CAM plants open their stomata at night, while C 3 and C 4 plants open their stomata during the day.

Phylum, morphological characterstics of e histolytica

morphological characterstics of e histolytica

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