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

Eukaryotic chromosomes, The vast amount  of genomic  DNA in a eukaryotic  c...

The vast amount  of genomic  DNA in a eukaryotic  cell is strongly  packaged  in chromosomes  having  within  a specialized  organelle and  the nucleus.  This very vast amount of e

Explain intraoral barrier techniques, Q. Explain Intraoral Barrier Techniqu...

Q. Explain Intraoral Barrier Techniques? Rubber dam A rubber dam is used whenever possible for improved vision and access and to reduce dental personnels' exposure to micr

Would this drug have negative side effect, Release of lysosomal enzymes fro...

Release of lysosomal enzymes from white blood cells during a local immune attack can contribute to the symptoms of inflammation. Suppose, to alleviate inflammation, you develop a d

Altered glucose metabolism - metabolic response to injury, Explain the Alte...

Explain the Altered Glucose Metabolism - Metabolic Response to Injury? Following injury, hypoglycemia commonly occurs and is related to the severity of the stress. In the ebb p

Steps for prevention industrial accidents, Steps for Prevention Industrial ...

Steps for Prevention Industrial Accidents These steps are as follow: Substitute a less hazardous equivalent. Remove worker from hazard (e.g. automate the sys

What is the salivary digestive enzyme, Q. What is the salivary digestive en...

Q. What is the salivary digestive enzyme? Which type of food does it digest and into which smaller molecules does it transform the food? The salivary hydrolase is known as sali

What is the name of the larval stage of polychaetes, Q. Is the embryonic de...

Q. Is the embryonic development in earthworms indirect or direct? The embryonic development is direct because in earthworms there is no larval stage. Q. What is the name of

What do you mean by pelvic girdle, What do you mean by Pelvic Girdle? B...

What do you mean by Pelvic Girdle? Bones in vertebrates which connect the appendages on left and right side of the posterior appendicular skeleton to each other. Pelvic girdles

Define exclusion chromatography - basic separation technique, Define Exclus...

Define Exclusion chromatography - basic separation technique? It is a chromatographic process, in which separation of the sample components takes place according to the molecul

Why nutrition is important for health, Why Nutrition is important for healt...

Why Nutrition is important for health Nutrition is one of the basic components of  life. It is an essential part of health care. You already know that good nutrition  is essent

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