Question

Male gametophyte of angiosperms/monocots is

• A. Nucellus
• B. Microsporangium
• C. Stamen
• D. Microspore

Answer 1

The correct option is D

Microspore

The correct option is D.

Explanation of the correct option:

1. In angiosperms, microspores indicate the male gametophyte.
2. Microspores divide mitotically, resulting in two unequal cells: a larger vegetative cell and a smaller generative cell.
3. The generative cell splits once more, resulting in two male gametes or sperms.
4. Microspore in angiosperms is also known as pollen grains.

Explanation of the incorrect options:

Option A:

1. The nucellus, also known as nucelli, is a layer of diploid (sporophytic) cells that forms directly inside the integuments and is a component of the ovule's inner structure.
2. The nucellus, which is enclosed by the integuments, develops around the embryo sac inside the ovule. The nucellus's one cell goes through meiosis to create four megaspores.
3. They have a lot of food stores and, in some plants, they serve as nutritive tissues for the embryo.
4. In the micropylar area, one of the nucellus cells develops and acts as a megaspore mother cell (MMC).

Option B:

1. Microsporangia are sporangia that generate male gametophytes when their microspores germinate.
2. Microsporangia are present in all vascular plants that exhibit heterosporic life cycles, including seed plants, spike mosses, and the genus Azolla of aquatic ferns.
3. In gymnosperm and angiosperm anthers, microsporangia generate microsporocytes, the microspore mother cells, which then undergo meiosis to produce four microspores.

Option C :

1. The male reproductive organs of flowering plants are stamens.
2. They are made up of an anther, which is where pollen develops, and a stalk-like filament, which transports water and nutrients to the anther and positions it to aid pollen dissemination in most species.

Final answer: Male gametophyte of angiosperms/monocots is a microspore.