Page 45 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

DRAWING DIAGRAMS - PARTS - PROCEDURE

TRANSVERSE SECTION OF LEAF Internal structure of leaf

1. Upper and lower surface of the leaf contain a single
layered upper epidermis and lower epidermis.
2. Both the upper and lower epidermis are covered with a thin layer
called Cuticle.
3. Palisade parenchyma arranged towards upper epidermis.
4. Spongy parenchyma arranged towards lower epidermis.
5. Air spaces are present in Parenchyma spongy.
6. Chloroplasts are present in both palisade and spongy parenchyma.
But the number of chloroplasts are more in palisade parenchyma
than spongy parenchyma.
7. Vascular bundles are present. It contains xylem and phloem.
8. Stomata are present in lower epidermis.
CHLOROPLAST Structure of chloroplast

1. In 1883, Julius Van Sachs discovered the chloroplast How to draw
in leaf cell. pl. scan QR
2. Chloroplasts are present in mesophyll of leaves and
other greeny parts of the plant.
3. Typical chloroplasts are in disc shaped.
4. They are green in colour due to the presence of chlorophyll.
5. They are covered by a double layered membrane.
6. They are filled with colourless fluid called Stroma.
7. Stalks of thylakoid membranes are located in stroma are called
Granum or Grana thylakoids.
8. Grana thylakoids are connected by Stroma thylakoids.
9. Chlorophyll and accessory pigments are located in Grana thylakoids
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