Problem 175 - Objective Biology for NEET

Question

The pistil in angiosperm is made up of (a) Ovary (b) Stigma (c) Style (d) All of these

Step-by-Step Solution

Answer

The pistil in angiosperm is made up of all mentioned options: (a) Ovary, (b) Stigma, (c) Style, hence choice (d) All of these is the correct answer.

Step 1: Understanding Basic Botany Terminology

Angiosperms are a type of plant that have flowers. The pistil is the female reproductive part of the flower. It consists of several parts.

Step 2: Recognizing the Components of the Pistil

The main parts of a pistil are the ovary, stigma, and style.

Step 3: Applying Knowledge to the Exercise

Considering the given options (a) Ovary, (b) Stigma, (c) Style, and (d) All of these, it can be concluded that (d) All of these is the correct choice, as each part listed contributes to the formation of the pistil.

Key Concepts

Angiosperm Reproduction

Angiosperms represent a large group of flowering plants that are characterized by their ability to reproduce through flowers. This process is intricate and allows for the continuation of plant species. At the heart of angiosperm reproduction are flowers, which have both male and female reproductive structures.
The key processes involved in angiosperm reproduction include:

• Pollination: This is the transfer of pollen (male reproductive cells) from the anthers to the stigma of a flower. It can occur via wind, insects, birds, or other animals.
• Fertilization: After successful pollination, the pollen travels down the pistil to the ovary. Here, it fertilizes the ovules, leading to the development of seeds.
• Seed Development and Dispersal: Once fertilized, the ovules develop into seeds. These seeds are encapsulated within a fruit, which aids in their dispersal to grow into new plants.

Angiosperm reproduction is crucial for the survival of many plant species and is also vital for agricultural crops.

Flower Anatomy

Understanding the anatomy of a flower is essential in grasping how angiosperms reproduce. The flower is the reproductive unit of the plant, and it typically comprises several key parts:

• Sepals: These are the outermost parts that protect the developing bud.
• Petals: Often brightly colored to attract pollinators, petals play a critical role in aiding pollination.
• Stamens: These are the male reproductive parts made up of anthers, which produce pollen, and filaments, which support the anthers.
• Pistil: The central female structure, consisting of the ovary, stigma, and style, which work together to facilitate fertilization.

Understanding these components helps in identifying and appreciating the complexities of flower function and their role in plant reproduction.

Female Reproductive Part

The female reproductive part of a flower, known as the pistil, is essential for plant reproduction. It consists of three main parts that work together to help the plant reproduce:

• Stigma: This is the topmost part of the pistil and is designed to catch pollen. It's often sticky or feathery, allowing it to capture pollen grains efficiently.
• Style: The style is a stalk that connects the stigma to the ovary. It serves as a passageway through which pollen travels to reach the ovules in the ovary.
• Ovary: Positioned at the base, the ovary houses the ovules, which, once fertilized, will develop into seeds.

Each component of the pistil is integral for the process of fertilization, ensuring that plants can reproduce and generate new generations. The collaboration of these parts exemplifies the intricate mechanisms nature has evolved for reproduction in angiosperms.