Question:

In cyathium inflorescence

Updated On: Jun 17, 2022
  • Single male flower is surrounded by female flowers
  • Single female flower surrounded by many maleflowers
  • Male and female flowers are borne in differentplants
  • There is one male and one female flower
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The Correct Option is B

Solution and Explanation

Cyathium is a special type of inflorescence. It is highly reduced and looks like a small flower. In this case an involucre of bracts fuses to form a deep cup-like structure. Nectaries are present at the rim of the cup. Many unisexual flowers are present in this cup. In the centre there is a single female flower. It is highly reduced and represented by a tricarpellary, syncarpous, gynoecium. This female flower is surrounded by 4-5 groups of male flowers. Male flower is also highly reduced and is represented by a single stamen. This inflorescence is found in some members of Euphorbiaceae like Euphorbia sp. and Poinsettia sp.
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Concepts Used:

Morphology of Flowering Plants

Morphology in flowering plants tells us that every plant has two systems such as a root system and a shoot system. The root system digs deep into the ground and structures a system of its own. On the other hand, the shoot system is the one that is above ground level and includes various plant parts. 

Root System

The descending part of the plant grows under the soil roots. During the germination process, the radicle from the seed grows earthward and branches out. The branches along with the primary root are called the root system. Roots lack chlorophyll and therefore they are not green in color. Roots are positively geotropic and hydrotropic, that is, they grow downwards ground and water, and negatively phototropic, which is growing away from light.

There are three types of root systems found in plants are as follows:

  1. TapRoot System
  2. Fibrous Root System
  3. Adventitious Root System

Shoot System

The stem is also an essential element of the plant. It is the ascending portion of the plant axis that bears branches, flowers, leaves, and fruits, as well as aiding in water and mineral conduction. It is the plant's aerial portion, brought about from an embryo's plumule or germinating seeds. Young stems are ordinarily green, but they finally turn woody and brown.