Question

In the case of which of the following types, the body of the ovule is straight but at right angles to the funicle?
(a)Orthotropous
(b)Campylotropous
(c)Hemitropous
(d)Amphitropous

Answer 1

Hint: Ranunculus is an example of a hemitropous ovule. Here the body of the ovule is completely fused to the funicle and is at the right angle to it.

Complete answer:
In the case of the hemitropous ovule, the body is turned through 90°, while chalaza and micropyle lie in a straight line. But the funicle of this ovule lies at a 90° angle (right angle) with both chalaza and micropyle. Therefore, in the case of the hemitropous ovule, the body of the ovule is straight but right-angled with the funicle.

Additional Information: Let us take a look at the features of the 4 types of ovule:
-Hemitropous- In this type of ovule, the body of the ovule is placed at a right angle to the funicle. The chalaza and micropyle both lie in a straight line. An example of a hemitropous ovule is Ranunculus.
-Orthotropous- In this type, the body is straight and erect in such a way that chalaza, hilum, and micropyle all lie in a straight line. An example is a polygonum.
-Campylotropous- In a campylotropous ovule, the body of the ovule is bent around so that chalaza and micropyle can't lie in a straight line. Leguminosae is an example of such a type of ovule.
-Amphitropous-In this type, the embryo also gets curved due to a very much pronounced state of the curvature of the ovule. Butomaceae is an example of an amphitropous ovule.
So, the correct answer is ‘Hemitropous ovule’.

Note: From the four different types of ovules mentioned in the question, only the body hemitropous ovule is erect and is at 90° with the funicle. The other three ovules are either bent or in a straight line with funicles.