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Chapter 2: Problem 11

Whorl of sepals in flower represents (a) Androecium (b) Gynoecium (c) Calyx (d) Corolla

Short Answer

Expert verified
The whorl of sepals in a flower represents the Calyx.

Step by step solution

01

Understand the structure of a flower

The flower is the reproductive part of the plant. It consists of multiple whorls or layers each having a specific function. The androecium is the male part of the flower which produces pollen. The gynoecium is the female part of the flower which houses the ovule. The calyx is composed of sepals which protect the bud before it opens. The corolla is formed by petals which attract pollinators with their bright colors and scent.
02

Identify the layer formed by sepals

Given the question, we are asked for the whorl of sepals in a flower. From our understanding in step 1, it is clear that sepals make up the calyx of the flower.

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Key Concepts

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

Sepals
Sepals are the small, leaf-like structures that are the outermost part of a flower. They often go unnoticed because they are usually green, similar to the plant's leaves, but they play a crucial role.
Before the flower blooms, sepals form a protective layer around the unopened flower bud, shielding it from harsh weather and potential damage. Once the flower opens, they help to support the petals, although they are not always visible in all flowers after blooming.
  • Sepals are typically green, but they can sometimes match the color of the petals in certain plants.
  • In some flowering species, the sepals fall off after the bud opens, but in others, they remain present.
Overall, sepals might not attract the attention like petals do, but they are vital for flower development and protection.
Calyx
The calyx is the collective term for all of the sepals in a flower. It forms the outermost whorl of the flower, enveloping the bud prior to blooming. The calyx serves as a protective barrier against the elements, ensuring the flower can develop safely.
Additionally, the calyx also plays a role in photosynthesis for some plants, contributing to energy production especially in the early stages of development.
  • The number and shape of sepals, and thus the calyx, can vary widely among different plant species.
  • A strong calyx can significantly enhance the chances of the flower surviving until it blossoms.
Both functional and integral, the calyx is essential for safeguarding young flowers.
Flower Anatomy
Flower anatomy involves understanding the complex structure and function of each flower part. Flowers are composed of several whorls, each with unique responsibilities that ensure successful reproduction.
The main parts include:
  • The **androecium**, which is the male part of the flower, produces and releases pollen. It comprises stamens that have anthers on their tips.
  • The **gynoecium**, the female part, includes the ovary, style, and stigma. It plays a crucial role in receiving pollen and housing ovules for fertilization.
  • The **calyx**, composed of sepals, as mentioned, protects the flower and aids early development.
  • The **corolla**, made up of petals, is often colorful and fragrant, luring pollinators for the flower.
Each component is meticulously designed to enable the plant's reproduction, showcasing the intricate beauty and complexity of flower anatomy.

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Most popular questions from this chapter

More than one ovule is found in the ovary of (a) Wheat (b) Paddy (c) Papaya (d) None of these

Monosporic development is referred to as (a) Single megaspore developing in the embryo sac (b) Single megaspore mother cell undergoing meiosis (c) Presence of single ovule in ovary (d) None of them is correct

Exine of pollen is (A) Hard outer layer of pollen grain (B) Most resistant organic matter known. (C) Layer made up of sporopollenin. (D) Layer which can withstand high temperature, strong acids and alkali. (E) Layer which cannot be degraded by any known enzyme. Which one of the following is correct? (a) \(\mathrm{A}\) and \(\mathrm{B}\) (b) A, B, C and D (c) \(\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}\) and \(\mathrm{E}\) (d) \(\mathrm{A}, \mathrm{C}\) and \(\mathrm{E}\)

Pollen grains (A) Represent gametophytic phase of plant (B) Can cause severe allergies like asthma and bronchitis (C) Are rich in nutrient (D) Are used as food supplements (E) Are available in form of tables and syrups in market of western countries (a) Only A is correct (b) All are correct (c) All are wrong (d) Only A, B and \(\mathrm{C}\) are correct

The plant which came in India as a contaminant with imported wheat is? (a) Vinca (b) Parthenium (c) Striga (d) Orobanche
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