Study the given figure showing structure of Euglina, and...

Study the given figure showing structure of Euglina, and select the option that correctly identifies $A, B, C$ and $D$. . $\begin{array}{lll}\text { A } & \text { B } & \text { C } & \text { D }\end{array}$ (a) Cytostome Photoreceptor Paramylum Myonernes (b) Contractile Pholoreceptor Paramylum Chloroplast vacuole bodies (c) Cytostome Stigma - Paramylum Chloroplast (d) Cytostome Stigma Myonemes Chloroplast

Study the given figure showing structure of Euglina, and select the option that correctly identifies $A, B, C$ and $D$.
.
$\begin{array}{lll}\text { A } & \text { B } & \text { C } & \text { D }\end{array}$
(a) Cytostome Photoreceptor Paramylum Myonernes
(b) Contractile Pholoreceptor Paramylum Chloroplast vacuole bodies
(c) Cytostome Stigma - Paramylum Chloroplast
(d) Cytostome Stigma Myonemes Chloroplast

Key Concepts

Chloroplast

Chloroplasts are the organelles responsible for photosynthesis in euglenoids and many other photosynthetic organisms. They convert light energy into chemical energy by fixing carbon dioxide into organic compounds, thus playing a critical role in the energy balance and metabolism of the cell.

Paramylon

Paramylon is a granular carbohydrate reserve found in euglenoids. It is composed of beta-1,3-glucan and serves as an energy storage molecule that can be metabolized when the cell needs energy, especially during periods when photosynthetic activity is limited.

Myonemes

Myonemes are contractile protein fibers present in certain protists, including euglenoids. They facilitate rapid changes in cell shape and contribute to the organism’s movement by enabling contraction and expansion, allowing for quick responses to environmental stimuli.

Cytostome

The cytostome is a specialized cell structure acting as an ingestion or feeding pore in various protists. In euglenoids, it is used to ingest food particles through phagocytosis, facilitating the intake of nutrients when environmental conditions limit photosynthesis.

Stigma

The stigma, commonly known as the eyespot, is a light-sensitive organelle found in many photosynthetic protists such as euglenoids. It helps the organism detect light intensity and direction, allowing it to orient its movement towards favorable light conditions for photosynthesis.

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