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The crossing over of optic nerve fibres at the optic chiasm allows the visual cortex to receive the same hemispheric visual field from both eyes. Superimposing and processing these monocular visual signals allow the visual cortex to generate binocular and stereoscopic vision.
The primary and secondary cell walls serve as the outer covering of the plasma membrane, while the middle lamella acts as the intermediate partition between two adjacent plant cells. Describe the role of the plasmodesmata in plant cell communication. Plasmodesmata form cytoplasmic channels, lined by membranes, that allow the cytoplasm of one plant cell to run continuously into an adjacent cell. Plasmodesmata unify an entire plant, generating linkages among all the cells. Cytoskeletal structures at the sites of the plas-modesmata guide large molecules towards the channels, facilitating their entry into adjacent cells. TEST YOUR KNOWLEDGE Question 1 Which of the following does NOT enclose a plant cell? collagen a. cellulose b. middle lamella c. primary cell wall d. secondary cell wall e.