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Cell wall
Concepts tested here
- Composition of cell wall
- Plasmodesmata
All Questions
2010 AIPMT-PRE 2 questions
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Which one of the following structures between two adjacent cells is an effective transport pathway?The cell wall and middle lamella of adjacent plant cells are traversed by fine cytoplasmic strands called plasmodesmata.
Plasmodesmata connect the cytoplasm of neighbouring cells, so substances can move from cell to cell through them; this continuous system is the symplast (symplastic pathway).
The plasmalemma is the plasma membrane of a single cell, plastoquinone is an electron carrier of the thylakoid membrane, and the endoplasmic reticulum is an organelle within a cell.
Hence the effective transport pathway between two adjacent cells is the plasmodesmata. -
Algae have cell wall made up ofNCERT states: 'Algae have cell wall made of cellulose, galactans, mannans and minerals like calcium carbonate, while in other plants it consists of cellulose, hemicellulose, pectins and proteins.'
So cellulose, galactans and mannans are the components characteristic of algal cell walls.
Hemicellulose, pectins and proteins are the components of the cell walls of higher plants.
Hence algae have a cell wall made up of cellulose, galactans and mannans.