Identify the statements which are incorrect.
1. The ovule is attached to the placenta by a stalk called the funicle.
2. The hilum is the region where the ovule and placenta are fused.
3. The nucellus is a mass of cells within the integuments that contains abundant reserve food materials.
4. The embryo sac or female gametophyte is located outside the nucellus and is formed from a megaspore.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 2 and 4 are incorrect.
A correct statement. 1. The ovule is attached to the placenta by a stalk called the funicle. The funicle is the stalk that joins the ovule to the placenta.
An incorrect statement. 2. The hilum is the region where the ovule and placenta are fused. The hilum is where the body of the ovule fuses with the funicle, not with the placenta. It is the junction between ovule and funicle.
A correct statement. 3. The nucellus is a mass of cells within the integuments that contains abundant reserve food materials. The nucellus lies inside the integuments, and its cells store food.
An incorrect statement. 4. The embryo sac or female gametophyte is located outside the nucellus and is formed from a megaspore. The embryo sac is formed from a megaspore, but it lies inside the nucellus, not outside it.
Statements 2 and 4 are incorrect.
NCERT Extract:
The Megasporangium (Ovule) – “… The ovule is a small structure attached to the placenta by means of a stalk called funicle. The body of the ovule fuses with funicle in the region called hilum. Thus, hilum represents the junction between ovule and funicle. … Enclosed within the integuments is a mass of cells called the nucellus. Cells of the nucellus have abundant reserve food materials. Located in the nucellus is the embryo sac or female gametophyte. An ovule generally has a single embryo sac formed from a megaspore.”
Figure 1.7 (d) A diagrammatic view of a typical anatropous ovule