Obturator - ovule, Biology

Assignment Help:

Obturator - Ovule

An obturator is an outgrowth of the placenta or funicle or integument or style near the micropyle. It is presumed to guide the pollen tube to the micropyle. This tissue is either composed of thin-walled compact tissue or it is made up of loose hairy outgrowths. The cells of the obturator at the ultra structural level, show dense cytoplasm containing a copious number of ER, dictyosomes, and vesicles. The cells of the obturator produce a surface exudate and provide mechanical and chemical guidance to the growing pollen tube.

323_Obturator.png

Figure:  Obturator in Tetragonia tetragonioides


Related Discussions:- Obturator - ovule

Male reproductive system - semen, SEMEN - Sperms and secretion of acces...

SEMEN - Sperms and secretion of accesory glands collectively known as seminal fluid or semen. It is milky, semi-solid in nature having particular smell. pH : 7.35 - 7.5. Spe

Discuss in brief distant and contact osteogenesis, Q. Discuss in brief dist...

Q. Discuss in brief distant and contact osteogenesis? Three terms are used to describe individual aspects of bone formation process that occur at implants. They are Osteocondu

Explain about the musculoskeletal system, Explain about the Musculoskeletal...

Explain about the Musculoskeletal System? Osteopenia (decrease in bone mineral content) is observed with aging. There is an average of 30% decline in the bone mineral density f

Germplasm conservation - plant tissue and organ culture, Germplasm Conserva...

Germplasm Conservation - plant tissue and organ culture Totipotent plant cells and shoot tips can be freeze-preserved in liquid nitrogen (-196? C) for long periods, and wh

Why are lysosomes known as the cleaners of the cell waste, Q. Why are lysos...

Q. Why are lysosomes known as "the cleaners" of the cell waste? Lysosomes carry out heterophagic and autophagic digestion autophagic digestion by digesting residual substances

What are differentiations of the cell membrane, In some types of cells, the...

In some types of cells, the cell membrane present differentiations that are essential for the specific functions of the cells. The major differentiations are the microvilli and the

Explain the stochasticity, Explain the Stochasticity? Ubiquitous noise ...

Explain the Stochasticity? Ubiquitous noise in biological systems creates stochastic methods central to modelling attempts. Stochasticity is available at all levels in environm

Set up a potometer in the laboratory, A student set up a potometer in the l...

A student set up a potometer in the laboratory and measured the rate of movement of water in the capillary. An average of four readings gave a rate of 50mm per minute. The apparatu

Fat cow syndrome, F a t cow syndrome Fat cow syndrome, also known as ...

F a t cow syndrome Fat cow syndrome, also known as fatty infiltration of liver, is a highly fatal disease in high yielding dairy animals that occurs a few days before or afte

Define briefly about the manganese toxicity, Define Briefly about the Manga...

Define Briefly about the Manganese Toxicity? Manganese is considered least toxic of the trace minerals through oral intake. However, some people may be at a risk to develop tox

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