Question

function of: cotylendons, aleurone layers,radicle, coleoptile

Answer 1

A cotyledon is part of the embryo within the seed of a plant. Often when the seed germinates, or begins to grow, the cotyledon may become the first leaves of the seedling. Botanists use the number of cotyledons present in the seed of a plant as a means of classification

aleurone layer:Its main function is to nourish the embryo enclosed in the seed. Aleurone layer is protein rich coat formed by the outermost layer of endospermic cells. Aleurone layer actively secretes fewenzymes which help in the process of seed germination.
Coleoptile is the pointed protective sheath covering the emerging shoot in monocotyledons such as grasses. Coleoptiles have two vascular bundles, one on either side.


radicle:It is the embryonic root inside the seed. It is the first thing to emerge from a seed and down into the ground to allow the seed to suck up water and send out itsleaves so that it can start photosynthesizing. The radicle emerges from a seed through the micropyle.

Answer 2

Function of Cotyledon

In dicot plants, the cotyledons are photosynthetic and function like leaves. The cotyledons are the first part of the plant to emerge from the soil. Some cotyledons last only days after growing from the soil and give way for other plant growth, while some cotyledons can last for years. The cotyledons are important for the new plant as it begins to grow because they contain the stored food reserves from the seed to give the plant its initial burst of energy to grow.  

Function of aleurone layer

Aleurone (from Greek aleuron, flour) is a protein found in protein granules of maturing seeds and tubers. The term also describes one of the two major cell types of the endosperm, the aleurone layer. The aleurone layer is the outermost layer of the endosperm, followed by the inner starchy endosperm.

Function of radicle

root anatomy and function. In root The primary root, or radicle, is the first organ to appear when a seed germinates. It grows downward into the soil, anchoring the seedling. In gymnosperms and dicotyledons, the radicle becomes a taproot. It grows downward, and branch, or secondary, roots grow laterally from it.

Function of coleoptile

To protect the shoot tip and embryonic leaves