Question

When the hilum, chalaza and micropyle of the ovule lie in the same longitudinal axis, it is known as

• A. Anatropous ovule
• B. Amphitropous ovule
• C. Campylotropus ovule
• D. Orthotropous ovule

Answer 1

The correct option is D Orthotropous ovule

In anatropous ovule, the ovule becomes completely inverted during development hence the micropyle is very close to the hilum.

In amphitropous ovule, the ovule and embryo sac are highly curved.

In campylotropous ovule, the ovule is curved hence the micropyle and chalaza do not lie in a straight line.

In orthotropous or atropous ovule, the ovule is straight and hilum, chalaza and micropyle lie in a straight line.

Thus the correct answer is option D.