Q. What is the direction of micropyle in anatropous ovule?
(a) Upward
(b) Downward
(c) Right
(d) Left
Solution :
Correct Option : B
Explanation of the correct option : Micropyle : The ovule is the female reproductive component of seed-bearing plants that develops into the seed following fertilization. The ovule is made up of three parts: the female gametophyte, the nucellus, and the integuments. Integuments are the seed’s protective coating that develops into the seed coat following fertilization .The nucellus is present inside the ovule, which serves as the megasporangium and feeds the female gametophyte .The integuments have a minute pore called a micropyle through which the pollen tube containing the pollen grain will enter .These pollen grains will join forces with the female gamete to generate an embryo . Orientation of ovule: The direction of the ovule varies depending on the plant .It can be orthotropous, amphitropous, or anatropous .Anatropous orientation is the most common in flowering plants and gymnosperms. In this case, the ovule is entirely inverted, 180 degrees away from the stalk, i.e., downward. The chalazal end will be near the top, with the micropyle close to the hilum. The funicle will be oriented parallel to the ovule and close to the micropyle. Final Answer: Thus, the direction of the micropyle in the anatropous ovule is downward.
