Problem 167 - Objective Biology for NEET

Question

Male sex organ in flower is (a) Antheridia (b) Stamens (c) Spermatangia (d) Nucule

Step-by-Step Solution

Answer

(b) Stamens

Step 1 - Identifying the Male Reproductive Part of a Flower

The main goal here is to understand the basic anatomy of a flowering plant. The male reproductive part of a flower is called the stamen. It is further divided into anther and filament. The anther produces pollen which is crucial for plant reproduction. Therefore, the correct answer should be option (b) Stamens.

Key Concepts

Stamen

The stamen is the male reproductive organ of a flower, crucial for the plant's lifecycle. It is typically composed of two main parts: the filament and the anther. The filament is a slender stalk that provides support, elevating the anther to an optimal position for pollen dispersal.

It's fascinating to note that the number, size, and positioning of stamens can vary widely among different plant species, reflecting a diversity in pollination strategies. Some flowers may have only a single stamen, while others could have hundreds, all designed to increase the chances of successful pollination.

Anther

The anther is located at the top of the stamen and holds a pivotal role in the life of a plant. It is here that pollen grains, which contain the male gametes, are produced. The anther typically consists of a pair of lobes connected by a common tissue, known as the connective.

Within these lobes, pollen sacs undergo a highly regulated process to develop pollen grains. Once mature, these grains are released into the environment where they can be transported to the female parts of a flower, either by wind, water, or pollinators such as bees and butterflies.

Pollen

Pollen grains are the carriers of the male reproductive cells in plants. These tiny grains are protected by a hard coat that not only safeguards the gametes from environmental stresses but also provides the necessary substances for the pollen to adhere to the female stigma.

Under the right conditions, a pollen grain will germinate on the stigma, developing a pollen tube through which the sperm cells can travel to reach the ovules. This process ultimately leads to fertilization and the production of seeds, which can grow into new plants.

Plant Reproduction

Plant reproduction, particularly in flowering plants, involves a delicate interplay between male and female parts, with pollination being a central event. During pollination, pollen grains are transferred from the anther of one flower to the stigma of another. This can happen within the same plant (self-pollination) or between different plants (cross-pollination).

After successful pollination and fertilization, the ovule develops into a seed, and the surrounding tissue often becomes a fruit. This complex process ensures the continuation of plant species and provides the foundation for much of life on Earth, including the food we eat and the natural landscapes we enjoy.