This set of Class 12 Biology Chapter 2 Multiple Choice Questions & Answers (MCQs) focuses on “Reproduction in Flowering Plants – Structure of Pistil”.
1. What represents the female part of the flower?
Explanation: Gynoecium represents the female part of the flower. It consists of a stigma, style and ovaries. The gynoecium is non motile. It’s the pollens that are motile. They fall on the stigma which starts the fertilization process.
2. What does syncarpous mean?
a) Fused carpels
b) Fused corolla
c) Fused androecium
d) Fused sepals
Explanation: Syncarpous means fused carpels. Carpels include the female reproductive structures–stigma, style, ovaries. It may exist singly or in a bunch. In syncarpous plants, the bunches are fused in different ways.
3. What is a pistil?
Explanation: Pistil is the free unit of a gynoecium. A pistil has three parts-style, stigma and ovaries. Stigma acts as a landing platform for the pollens. Style is the long tube-like structure that carries the male gamete to the ovaries.
4. How to identify the ovary?
a) Multiple layers
b) Thin and short
c) Long tube-like structure
d) Basal swollen part
Explanation: Ovaries can be identified by their characteristic appearance by being the basal swollen part. The style connects the ovary with the stigma. An ovary may have one or more ovules.
5. What does the stigma do?
a) Compatibility test
Explanation: Stigma acts as a landing place for the pollen grains from where the style carries it to the ovaries for the fertilization. Stigma also checks the pollen grain for compatibility or incompatibility.
6. Stigmas are free in hibiscus.
Explanation: In hibiscus, the stigma and style are long and free. It comes out of the flower to allow easy pollination. Stigma may be only one in number to many. They appear in different ways, either in a bunch or singly.
7. In which condition should the ovaries be free?
Explanation: In apocarpous condition the ovaries must be free, though the other parts maybe fused. Example Oleandar. In simple words, separate carpels.
8. What are locules?
Explanation: The ovary carries the ovules. It has an ovarian cavity with one or more chambers or locules. There are different ways in which the ovules may align themselves in the ovary.
9. What is a placenta?
b) Parenchymatous cushion
Explanation: The ovule bearing parenchymatous tissue is known as the placenta. It is also the part of the ovary where the funiculus attaches itself. Just like in humans, the placenta provides nutrition to the growing ovules.
10. Papaver is ______
Explanation: Papaver, commonly known as poppy is a syncarpous flower. The carpels in this flower are fused together. Sometimes the style and stigma maybe free like in hibiscus. In an apocarpous condition, the ovaries must be free.
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