Question

Where in an angiosperm would you find a megasporangium?

(A) in the style of a flower

(B) enclosed in the stigma of a flower

(C) within an ovule contained within an ovary

of a flower

(D) packed into pollen sacs within the anthers found on a

stamen

Short answer

(A) The statement “in the style of a flower” isfalse.

(B) The statement “enclosed in the stigma of a flower” isfalse.

(C) The statement “within an ovule contained within an ovary of a flower” istrue.

(D) The statement “packed into pollen sacs within the anthers found on a stamen” is false.

Step-by-step solution

Angiosperms

In biology, the eukaryotic kingdom of Plantae comprises several groups of plants, angiosperms being one of them. These plants are regarded as the most evolved group due to the presence of flowers and their ability to produce fruits (seeds remain protected within this structure).

Explanation of option ‘(A)’

The female whorl of flowers contains pistil, formed of three parts: the style, ovary, and stigma. Pollens are received at the stigma’s sticky end and then transferred towards the ovary through the style; style is the tubular structure connecting the ovary with stigma.

Thus, style does not contain a megasporangium.

Therefore, the given statement is false.

Explanation of option ‘(B)’

The stigma is the uppermost end of the pistil and is functionally involved in receiving the pollens from different pollinating agents. The stigma has a sticky surface which facilitates the collection of pollens.

Thus, the stigma only has a surface for collecting pollens and does not contain megasporangium.

Therefore, the given statement is false.

Explanation of option ‘(C)’

The term ovary denotes the terminal portion of the pistil, and it is the structure where fertilization and development of seed occurs. The ovule lies inside the ovary; the ovule contains another structure termed megasporangium (the structure that produces megaspores).

Thus, the megasporangium is located within the ovule portion of the ovary.

Therefore, the given statement is true.

Explanation of option ‘(D)’

The male whorl of the flower comprises stamen, consisting of two portions, a slender filament, and a comparatively short anther. The pollens are produced with the pollen sacs (also termed microsporangia) located within the anther.

Thus, the description given in this option relates to the microsporangia and not to the megasporangium.

Therefore, the given statement is false.