Plant cell

Plant cell

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Plant cell by Mind Map: Plant cell

1. Epidermal tissue

1.1. Structure

1.1.1. closely packed cell secrete waxy cuticle

1.2. Function

1.2.1. provide a protective barrier against mechanical injury,water loss and infection

2. Ground tissue

2.1. Parenchyma

2.1.1. Structure cells are loosely arranged with many intercellular air spaces

2.1.2. Location/Distribution In cortex, pith, packing tissues in phloem and xylem

2.1.3. Function packing tissues in stems and roots for support and turgidity potentially meristematic (root and shoot tip) allow gaseous exchange storage organ for food (potato) site of photosynthesis secretion (eg: resin)

2.2. Collenchyma

2.2.1. Structure Cells are closely packed cells with a little or few intercellular air spaces

2.2.2. Location/distribution Below epidermis in stems and petioles of leave. This allows them to bend in the wind

2.2.3. Function Give mechanical strength and flexibility/elastic support. (allow cell to expand as it growth-stretchable) As supporting tissue in herbaceous plant/young parts of plant/soft and non-woody plant organ

2.3. Sclerenchyma

2.3.1. Structure Cells are closely/tightly arranged with no intercellular space

2.3.2. Location/distribution Fibers- vessel elements and tracheid of xylem Sclereids- give hard structure and gritty structure in pears and guava

2.3.3. Function Give mechanical strength, structural support and rigidity to the plant result of lignin deposition in secondary walls Give protection from mechanical damage

3. Vascular tissue

3.1. Xylem

3.1.1. Tracheids Structure cylindrical shape with tapering ends which is overlaps and interlocked with one another

3.1.2. Vessel element Structure Cylindrical shape with less tapering ends (end wall forming partially or completely perforated end wall)

3.1.3. Function Transport water and minerals through vessel elements and tracheid

3.2. Phloem

3.2.1. Sieve tube Structure Large in diameter, long tube with no nucleus. Assist by companion cells for functioning because at maturity, most of the organelles are degenerate Have perforated ends forming sieve plate Function Transporting sucrose and organic substances from leaves throughout plant

3.2.2. Companion cells Structure Shorter and smaller with dense cytoplasm no perforated ends Function Assist sieve tube