Question

Ovule in which funicle, chalaza, and micro Pyle occur in one vertical plane is __________.
a. Anatropous
b. Orthotropous
c. Amphitropous
d. Campylotropous

Answer 1

In every seed plant, the most important structure that gives rise to offspring and contains the female reproductive cells is the ovule. The ovule consists of three parts, as mentioned below:
- The instrument which forms its outer layer.
- The nucellus.
- The female gametophyte is located at the center.

Complete answer:
Ovules in which the funicle, chalaza, and micropyle lie in one for all purposes in a straight line generally are known as orthotropous ovules. An example is Urticaceae, which further shows how those ovules in which the funicle, chalaza, and micropyle particularly lie in one pretty straight line essentially are called orthotropous ovules.

Option A- Anatropous ovules are those which have definitely turned $180^\circ$ and so the micropyle essentially lies close to the hilum, generally further showing how anatropous ovules are those that literally have actually turned $180^\circ$ and so the micropyle generally lies kind of close to the hilum in a subtle way.

Option B- Orthotropous ovules for the most part are those that kind of have funicle, chalaza, and micropyle kind of lie in one fairly straight line in a big way. Orthotropous is the most primitive type of ovule which is found in the beetle, piper, Polygonum.

Option C- Amphitropous ovules essentially are curved and particularly are horseshoe-shaped, which for the most part shows that a, which for the most part is quite significant.

Option D- Campylotropous ovules are curved such that micropyle and hilum do not essentially lie in the basic straight line in a very big way.

Hence, the correct answer is option (B).

Note: The orthotropous ovule lies in a straight line because of the alignment of chalaza, micropyle and funicle. Orthotropous types of ovules are primitive and generally found in the members of Polygonaceae and Piperaceae family.