Question

In an anatropous ovule the micropyle is
A. In straight line with the funicle.
B. At right angle with funicle.
C. At $45^o$ with funicles.
D. Side by side with funicle.

Answer 1

Hint: Depending upon the bending of the stalk attached to the carpel wall, ovule shape and position are determined.

Complete answer:
Ovule placement is of six types:
> Orthotropous ovule: This ovule is a completely straight ovule. Here the micropyle is present at the apex of the ovule.
> Anatropous ovule: This ovule is completely inverted ( turned by 180 degrees )where the micropyle of the ovule is side by side with the funicle.
> Hemitropous ovule: This ovule is located at an 90o angle to the funicle.
> Campylotropous ovule: This ovule is curved and the micropyle is almost touching the funicle.
> Amphitropous ovule: This ovule is partly inverted ovule which is turned back at a 90o angle on the stalk.
> Circinotropous ovule: This ovule is surrounded by its long funicle (it makes a circle around the ovule).

So, the correct answer is ‘side by side with the funicle’

Note: Ovule is initially made up of diploid tissue which is maternal. This includes a megasporocyte. Megaspores remain inside the ovule and divide by mitosis which further goes on to produce the megagametophyte which is the haploid female gametophyte. Post fertilization, the ovule consists of a diploid zygote. This zygote after cell division will form an embryo to give rise to the sporophyte of the next generation.