Question

Ovules of Cycas are found on_______ side of megasporophyll
A. Upper
B. Lower
C. Lateral
D. None of the above

Answer 1

Hint: The ovules are orthotropous, unitegmic, and sessile or without further ado followed. The Cycas ovule is the biggest in the plant realm with 6-7 cm in diameter. The collection of the ovule is called nucellus (megasporangium), secured by a thick integument on all sides aside from an opening called the micropyle.

Complete answer:
In Cycas, various species show a distinctive number of ovules fluctuating from 1-4 sets or more on the lateral sides of the megasporophyll in the rich center district. Female cones consisting of approximately sorted out sporophylls and without a focal pivot describe the Cycadaceae. They bear their ovules on the edges of a basal tail-like structure. The ovules are sessile and are borne horizontally on the tail. The ovules of Cycas are the biggest in the plant realm (7 cm long in C. species, 6 cm long x 4 cm distance across in C. circinalis) and can be seen by the unaided eye. The ovule is green when youthful and is secured by hairs. At development, its shading changes to orange, and hair likewise tumble off. The ovules are orthotropous (short and straight) and unitegmic (with one integument).
Hence, option C is correct.

Note: The integument is exceptionally thick and comprises of three unmistakable layers:
-Outer, a green or orange plump layer called external sarcotesta
-Middle, a yellow stony layer called sclerotesta and
-Inner meaty layer or inward sarcotesta.
The integument encases all the nucleolus aside from at a certain point. This point or opening is called the micropyle. Just underneath the micropyle, the cells of the nucellus structure the nucellar nose. A portion of the cells of the nucellar mouth breaks down and shapes a cavity-like structure called a dust chamber.