What is the characteristic of Amphitropous ovule?
Amphitropous – The body of the ovule is curved so much that it induces curvature in the embryo sac. Examples are Lemna, Poppy, Alisma, etc. For an amphitropous ovule, the Body of the ovule as well as the embryo sac are curved.So, the correct answer is option ( B ).
What ovule is horse shoe?
Amphitropous
When the ovule is curved and embryo sac becomes horse-shoe shaped, such an ovule is called as Amphitropous. In this, the body of ovule is placed transversely at right angles to the funicle.
What is difference between Anatropous and Orthotropous ovule?
Anatropous is the most common ovule orientation seen in angiosperms in which the ovule is completely inverted in 180o so that the micropyle and hilum come closer to each other. On the other hand, orthotropous is an ovule orientation in which the micropyle lies directly in line with the hilum.
What is Tenuinucellate ovule?
Nucellus is the central part of ovule from which embryo sac develops. It may be massive known as crassinucellate or very thin called tenuinucellate.
What is Amphitropous ovule?
Definitions of amphitropous ovule. a partly inverted ovule turned back 90 degrees on its stalk. type of: ovule. a small body that contains the female germ cell of a plant; develops into a seed after fertilization.
What is Hemi-Anatropous?
Hemi-anatropous or hemitropous ovule- The ovule looks like it’s lying on its side because it is at a right angle to the funicle. Amphitropous ovule- This ovule is horseshoe-shaped due to the curvature of its body and the embryo sac.
What is Anatropous ovule?
An anatropous ovule is one in which curvature during development results in displacement of the micropyle to a position adjacent to the funiculus base; this is the most common ovule type of the angiosperms and is presumed to be ancestral.
What does Tenuinucellate mean?
tenuinucellate (not comparable) (botany) Having no nucellar tissue separating the embryo sac and the epidermis.
What is Circinotropous ovule?
Circinotropous ovule is found in the family Cactaceae. Example, Opuntia. Ranunculus has Hemianatropous ovule in which body of ovule is turned through 90° and micropyle and chalaza lie in straight line but funiculus is at 90° to both of these.
What is raphe ovule?
The raphe is the ridge formed by union of funicle with the body of the ovule. The hilum is a structure through which the body of the ovule remains attached to the funicle.
What is Crassinucellate ovule?
∙ Nucellus is the tissue present between megasporophyte and epidermal layer of ovule. ∙ Generally, this tissue is present in a single layer. But when it is present in multiple layers, the nucellus is said to be well-developed and the ovule possessing such nucellus is called crassinucellate ovule.
What is Tritegmic?
Tritegmic- Ovules that have three layers of integument are called tritegmic, like Asphodelus. It has been observed that the lesser the number of integuments, more specialized is the integument itself.