Question

Which of the following is the correct option regarding apocarpous gynoecium?
A. Rose, Michelia, Papaver.
B. Papaver, Hibiscus, Lotus.
C. Rose, Lotus, Michelia
D. Papaver, Michelia, Lotus

Answer 1

A flower may have one carpel, two or more distinct carpels. A typical carpel has three regions: The stigma, style and ovary.
-Monocarpous: These have only one carpel.
-Apocarpous: When carpels are free.
-Syncarpous: When carpels are fused.

Complete step by step answer:
Gynoecium is also called carpels or pistils. It is the female reproductive part of the flower. According to the number and structure of the carpels they are classified into following three categories.
-Monocarpous ovary: In this type of flower the gynoecium forms a single ovary which can be simple of compound, as beans, maize, mustard, etc. Many of the annual and biannual herbs are of monocarpic, also some of the longer duration plants are also monocarpous, like century plant and Avocado (Persea species),other example of syncarpous gynoecium are legumes (Fabaceae)
-Apocarpous ovary: In these types of flowers an apocarpous ovary is present that has more than one carpel. These carpels are free. For example- lotus and rose and michelia flowers. Strawberry (Fragaria species), Buttercup (Ranunculus species) are also some of other examples of apocarpous gynoecium.
-Syncarpous ovary: These types of flowers come under the category of syncarpous that has more than one carpel. But, these carpels are fused. For example- flowers of tomato and mustard. Papaver plants, Tulip (Tulipa species), and most flowers are also some of other examples of syncarpous gynoecium.
Hence, the correct option is (C) Rose, Lotus, Michelia.

Note:
-In Rosaceae (Rose family) Gynoecium - Pistiles may be one or many. If it is one, then they are in compound form and composed of 2-5 carpels; if many, then they are simple and free from.
-In Lotus (Nelumbonaceae) Gynoecium – Pistil is 1 celled and carpels reduced in number comparative to the perianth. Gynoecium is monomeric, of one carpel and superior.
-In Michelia (Magnoliaceae) Gynoecium - swollen ovaries are there in each carpel, structurally they are of curved style and beaked shaped with simple stigma. Also there are many ovules in each carpel.