Ovule, Biology

Assignment Help:

Ovule

The ovule, also known as the megasporangium is the forerunner of the seed. It consists of a central mound of tissue called the nucellus, which is enveloped by one or two coverings - the integuments. An ovule ready for fertilization consists of nucellar tissue enveloped almost completely by integument(s), leaving a small pore or opening at the apical end.

This opening, called micropyle is the main passage for the entry of the pollen tube into the ovule. This end of the ovule is generally referred to as the micropylar pole and the opposite pole where funiculus is attached is called the chalazal pole. The ovule is attached to the placenta through a stalk-like structure the funiculus. In the nucellus is present the female gametophyte which is commonly referred to as the embryo sac.

 


Related Discussions:- Ovule

What are the penetrance and the expressivity of a gene, What are the penetr...

What are the penetrance and the expressivity of a gene? The Individuals that carry a same genotype don't always manifest in an identical manner the correspondent phenotype. The

How is the respiratory system of insects, Q. How is the respiratory system ...

Q. How is the respiratory system of insects with its independence between respiration and circulation related to the motor agility of some species of this arthropod class? Even

Reptiles, biting mechanism in snakes

biting mechanism in snakes

Which terrestrial vertebrate group is extremely rare deserts, Which terrest...

Which terrestrial vertebrate group is extremely rare in deserts? The Amphibians are terrestrial vertebrates very rare in desert environments (although there are a few species a

Explain the protein efficiency ratio (per), Explain the Protein Efficiency ...

Explain the Protein Efficiency Ratio (PER)? PER method was developed by Osborne, Mendel and Ferry in 1919 and is based on the growth of young rats. The diets usually contain 10

What volume of 1.20 m naoh solution must we add, You have 875 mL of a 0.37 ...

You have 875 mL of a 0.37 M acetic acid solution. What volume (V) of 1.20 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.36? (The pKa of acetic acid i

Echocardiography, Echocardiographic evaluation should be performed in all p...

Echocardiographic evaluation should be performed in all patients with clinically suspected IE, including those with negative blood cultures.  Not only is TEE the preferred approach

Which type of energy is used in photosynthesis transformed, Q. Into which t...

Q. Into which type of energy is the light used in photosynthesis transformed? The luminous energy used in the photosynthesis is transformed in to the chemical energy.

Physiology, what happens to your total peripheral resistance when you go fr...

what happens to your total peripheral resistance when you go from a warm room to cool outside air

Shifting attention by dopamine, Q. Shifting attention by Dopamine? Dopa...

Q. Shifting attention by Dopamine? Dopamine: Dopamine plays a pivotal role in aspects of shifting attention. Administration of D1/D2 receptor antagonist haloperidol impairs the

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