Module: | Pre-fertilization: Micro/Megasporogenesis
Q4: Consider the following statements regarding the structural components of the megasporangium (ovule):
1. The funicle is the stalk that attaches the ovule to the placenta.
2. The hilum represents the junction between the body of the ovule and the funicle.
3. The chalaza represents the basal part of the ovule, located directly opposite the micropylar end.
Which of the above statements is/are correct?
2. The hilum represents the junction between the body of the ovule and the funicle.
3. The chalaza represents the basal part of the ovule, located directly opposite the micropylar end.
Which of the above statements is/are correct?
✅ Correct Answer: D
The correct option is D. All three statements are correct.
The megasporangium, or ovule, is a small structure attached to the placenta of the ovary by a stalk called the funicle.
Structurally, the body of the ovule fuses with the funicle at a specific region called the hilum, making the hilum a scar equivalent to a plant's umbilical connection.
The ovule is surrounded by one or two protective envelopes called integuments, which encircle the nucellus except at the tip where a small opening, the micropyle, is organized.
Directly opposite to the micropylar end is the chalaza, representing the basal origin point of the integuments.
Understanding this spatial orientation is critical for classical botany and exam contexts, as the orientation determines the type of ovule (e.g., anatropous, the most common type in angiosperms, where the body is completely inverted so the micropyle lies close to the hilum).
The megasporangium, or ovule, is a small structure attached to the placenta of the ovary by a stalk called the funicle.
Structurally, the body of the ovule fuses with the funicle at a specific region called the hilum, making the hilum a scar equivalent to a plant's umbilical connection.
The ovule is surrounded by one or two protective envelopes called integuments, which encircle the nucellus except at the tip where a small opening, the micropyle, is organized.
Directly opposite to the micropylar end is the chalaza, representing the basal origin point of the integuments.
Understanding this spatial orientation is critical for classical botany and exam contexts, as the orientation determines the type of ovule (e.g., anatropous, the most common type in angiosperms, where the body is completely inverted so the micropyle lies close to the hilum).