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Meghna Thapar 5 years, 4 months ago
Collenchyma –
The cells of collenchyma tissue are living, elongated and irregularly thickened at the corners. There is very little or no intercellular space. It allows easy bending in various parts of a plant (leaf, stem) without breaking. Thus, provides flexibility to the plant. It also provides mechanical support to plants.
Sclerenchyma –
The cells of sclerenchyma tissue are dead. They are long and narrow as the walls are thickened due to deposition of lignin. The walls of cells are so thick that there is no internal space inside the cell. This tissue is present in stems, around vascular bundles, in the veins of leaves and in the hard covering of seeds and nuts. It provides strength to the plant parts and makes the plant hard and stiff.
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Meghna Thapar 5 years, 4 months ago
Guttation is when a plant pushes water out through tips of the leaves of plants. These are special pores called hydathodes.
Guttation is when water is secreted from the tips of the leaves of plants. Guttation happens in certain plants that have vascular systems, such as grass, wheat, barley, tomatoes, strawberries, and other small plants. Since guttation relies on pressure, it can't occur in large plants, such as trees, because the pressure required to force the water out is too large.
Guttation happens at night when the soil is very moist and the roots absorb water. If there is too much water, root pressure causes the water to squeeze out of the plant and onto the tips of the leaves or the blades of the plant. As water from soil passes through the guttation process, it picks up minerals, enzymes and other chemicals and is called xylem sap.
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Yogita Ingle 7 years, 4 months ago
Septate hyphae: The hyphae that are composed of individual cells separated from one another by cell walls. The septa have openings called pores between the cells, to allow the flow of cytoplasm and nutrients throughout the mycelium.
Aseptate hyphae: There are no cell walls in the individual cells and their nuclei are spread throughout the hypha. They are the more primitive form of hyphae; species with septate hyphae diverged from a common ancestor with coenocytic hyphae.
Gaurav Singh 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Phylogenetic system is a type of classification system which is based on evolutionary relationship. This classification system does not only depend upon characteristic similarities but also try to find out whether the organisms were related somehow during evolution.
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Meghna Thapar 5 years, 4 months ago
Periderm is composed of the phellogen, phellem, and phelloderm.
During secondary growth, the outer epidermal layer and the cortical layer are broken because of the cambium. To replace them, the cells of the cortex turn meristematic, giving rise to cork cambium or phellogen. It is composed of thin-walled, narrow and rectangular cells.
Phellogen cuts off cells on its either side. The cells cut off toward the outside give rise to the phellem or cork. The suberin deposits in its cell wall make it impervious to water. The inner cells give rise to the secondary cortex or phelloderm. The secondary cortex is parenchymatous.
Posted by Ritika Sinha 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
The difference between the stomata of monocot and dicot are -:
1. Stomata distribution - In monocots stomata are equally distributed while in the dicots the stomata is usually found on the lower surface of the leaf.
2. Guard cell shape - In monocots the guard cells are dumbell shaped while in the dicots they are kidney or bean shaped.
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Sadhvi Deshpande 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
| Dicot stem | Dicot root |
| 1. Cells are thick walled. | 1. Thin walled. |
| 2. Epidermal hairs are present and are multicellular. | 2. Unicellular root hairs are present. |
| 3. Cuticle present. | 3. Cuticle Absent. |
| 4. Stomata present. | 4. Stomata Absent. |
| 5. Hypodermis present. | 5. Hypodermis Absent. |
| 6. Endodermis wavy, deposited with starch. | 6. Circular, contains casparian strips and passage cells. |
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