Biology - Exemplar

6. Anatomy of Flowering Plants

1. The Living World
2. Biological Classification
3. Plant Kingdom
4. Animal Kingdom
5. Morphology of Flowering Plants
6. Anatomy of Flowering Plants
7. Structural Organisation in Animals
8. Cell : The Unit of Life
9. Biomolecules
10. Cell Cycle and Cell Division
11. Transport in Plants
12. Mineral Nutrition
13. Photosynthesis in Higher Plants
14. Respiration in Plants
15. Plant Growth and Development
16. Digestion and Absorption
17. Breathing and Exchange of Gases
18. Body Fluids and Circulation
19. Excretory Products and Their Elimination
20. Locomotion and Movement
21. Neural Control and Coordination
22. Chemical Coordination and integration
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Q. 55.0( 2 Votes )

Each of the following terms has some anatomical significance. What do these terms mean? Explain with the help of line diagrams.

a. Plasmodesmata

b. Middle lamella

c. Secondary wall

Class 11th Biology - Exemplar 6. Anatomy of Flowering Plants

Answer :

a. Plasmodesmata – A microscopic channels between two cells through the cell wall are called Plasmodesmata. Plasmodesmata allow transport of materials between two cells. They are protoplasmic strands between adjacent plant cells.

b. Middle lamella – It is a layer in the cell wall and is made of calcium pectate (mainly) and magnesium pectate. It helps in cementing between two neighbouring cells. During ripening a fruit becomes soft and pulpy due to dissolution of middle lamella.

c. Secondary wall – this is a non-extensible layer. It is made of hemicelluloses. It provides rigidity to the cell. The cell wall of a young plant cell is capable of growth, which gradually diminishes as the cell matures and the secondary wall is formed on the inner (towards membrane) side of the cell. Secondary cell wall may have the deposition of lignin. Secondary wall helps in the differentiation of the cell.

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PREVIOUSAssume that a pencil box held in your hand represents a plant cell. In how many possible planes can it be cut? Indicate these cuts with the help of line drawings.NEXTDistinguish between the following:a. Exarch and endarchb. Stele and vascular bundlec. Protoxylem and metaxylemd. Interfasicular cambium and intrafasicular cambiume. Open and closed vascular bundlesf. Stem hair and root hair

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