This set of Class 12 Biology Chapter 2 Multiple Choice Questions & Answers (MCQs) focuses on “Reproduction in Flowering Plants – Structure of Megasporangium”.
1. What is a megasporangium?
Explanation: An ovule is an integumented megasporangium found in spermatophytes which develops into a seed on fertilization. The cells within the megasporangium are diploid which will divide via meiosis to form 4 megaspores.
2. Angiosperm ovules are generally ______
Explanation: Angiosperm ovules are generally ovoid in shape and whitish. The usually occur on the parenchymatous cushion inside the ovary which is also known as the placenta. Either singly or in a cluster.
3. Where do the ovules grow?
Explanation: The ovules grow and mature on the parenchymatous cushion in the ovary, also known as the placenta. Placenta is the medium through which young ovules get nutrition. The ovules may appear singly or in a cluster.
4. What is the stalk called?
Explanation: The ovule is stalked. The stalk or the funicle is connected to the ovary by the placenta. This point is known as the hilum. It’s through which water and nutrients go inside the ovary.
5. Depending on the configuration, 6 types of ovaries are present.
Explanation: Yes. There are 6 types of ovaries present according to its configuration. Orthotropous (atropous, erect), anatropous (inverted), hemitropous (half inverted), campylotropous (body curved), amphitropous (both body and embryo sac curved) and circinotropous (funiculus coiled around the ovule).
6. In a typical anatropous, the funicle is ____ with the ovary.
Explanation: In a typical anatropous, the funicle is fused with body of the ovary. It gives a longitudinal rise called the raphe. The funicle contains the vascular strands that provide nourishment to the ovary.
7. Mass of parenchymatous cells on the body of the ovary is also called ______
b) meristematic cell
Explanation: The mass of parenchymatous cells are also known as the Nucellus. It maybe massive (crassinucellate ovule) or thin (tenuinucellate ovule). Its surrounded by one or more teguments.
8. What is ategmic?
a) Presence of 1 tegument
b) Presence of 3 teguments
c) Absence of integuments
d) Presence of 2 teguments
Explanation: Ategmic means the absence of integuments. Integuments are a natural outer, protective layer. Just like skin in animals, integument in plants is thin and layered.
9. Passage at one end of the ovary is called as _______
Explanation: Passage or pore present at the end of the ovary is called a micropyle. It is a small opening through which water, air, nutrients, etc. go. This pore or passage is left by integuments.
10. Origin of integuments are _____
Explanation: Chalaza is the origin of the integuments or also known as the point where the nucellus attaches itself to the integument. They are usually present on the opposite sides of the ovule (opposite to the micropyle).
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