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Chapter 2: Problem 71

Megasporangia is referred to as (a) Ovule (b) Ovary (c) Gynoecium (d) All of these

Short Answer

Expert verified
The alternative term for 'Megasporangia' is 'Ovule' (a).

Step by step solution

01

Understanding the Terminology

Initially, terms need to be understood properly. 'Megasporangia' is a term used in botany, which refers to the organ in seed plants that produces and contains the megaspore (or simply, the female gamete).
02

Comparing Terms

By comparing the alternatives, we find that 'Ovule' is the part of a seed plant where female reproductive cells are formed. This aligns with the definition of 'Megasporangia' mentioned above.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Ovule
The ovule is a small structure found within seed plants that is crucial for reproduction. It acts as the megasporangia, meaning it is responsible for producing the female gamete, also known as the megaspore. When fertilized, the ovule develops into a seed. This makes it a key component in the life cycle of seed plants.

In many plants, the ovule consists of several parts:
  • Integuments: These are protective layers surrounding the inner parts of the ovule. They eventually form the seed coat.
  • Nucellus: A tissue located within the ovule where the female gamete forms.
  • Embryo Sac: The structure within the nucellus that houses the female gametes prepared for fertilization.
The formation of an ovule is essential for sexual reproduction in seed plants, as it enables the creation of a new generation of plants.
Seed Plants
Seed plants, also known as spermatophytes, have a distinct way of reproducing through the development of seeds. These plants include both gymnosperms (like pine trees) and angiosperms (flowering plants). Unlike non-seed plants, seed plants produce seeds which contain an embryo, a food supply, and a protective outer covering.

The significance of seeds in these plants includes:
  • Protection: Seeds protect the developing embryo from harsh environmental conditions until the right growth conditions are present.
  • Dispersal: Seeds come in various forms and can be dispersed over great distances through wind, water, or animals.
  • Dormancy: Seeds can remain dormant during unfavorable conditions, allowing them to survive until a more suitable environment occurs.
Seed plants are pivotal in many ecosystems as they dominate most land areas and provide food and habitat for many other organisms.
Female Gamete
The female gamete in seed plants is crucial for the reproduction process. It is produced within the ovule, which acts as the megasporangia. Commonly referred to as the megaspore, the female gamete is involved in the sexual reproduction of plants.

Key characteristics of female gametes include:
  • Haploid Nature: Consists of a single set of chromosomes, similar to male gametes, thus termed haploid. This genetic setup allows for variation when gametes fuse.
  • Formation: In seed plants, female gametes form through a process called megasporogenesis within the ovule.
  • Function in Fertilization: The female gamete merges with the male gamete (pollen) to form a diploid zygote, ultimately developing into a new plant.
The female gamete's fusion with the male gamete is the first step towards forming a new seed, showcasing its importance in plant reproduction.

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Most popular questions from this chapter

Which of the following is incorrect for equate plants? (A) Vallisneria and Hydrilla are fresh water plants pollinated by wind. (B) Zostera a marine grass uses water as its pollinating agent. (C) Water hyacinth and water lily are pollinated by insects or wind. (D) Most of the aquatic plant flowers emerges out of water and are pollinated by wind or insects. (a) Only B (b) Only A (c) Only A, B and \(\mathrm{C}\) (d) All are incorrect

Assertion: Angiosperm can colonize is other areas easily. Reason: Angiosperms have seeds and seeds have better adoptive strategies for dispersal to new habitats.

Pollen grains are mature when (a) It contains vegetative and generative cell (b) It contains only single haploid cell (c) Contains two haploid cell (d) Both (a) and (c)

The only type of pollination during which pollination brings genetically different types of pollen grains to stigma (a) Xenogamy (b) Geitonogamy (c) Autogamy (d) All of these

What happens when the pollen falls on the stigma? (a) Pollination (b) Reject of pollen (c) Only the compatible pollen germinates (d) Autogamy
See all solutions

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