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These are the answers to the quiz.
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1) The apical cell wall of the epidermal cells contains cutin, which is synthesized by the epidermal cells. Cutin minimizes water lost.
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| Not answered. It is true. |
2) The opening of stomata is controlled by the turgency of guard cells.
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| Not answered. It is true. |
3) The root epidermis is composed of cells that usually lack cutin, but contain suberin in those regions of the root where absorption of water takes place.
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| Not answered. It is false. Suberin is only present in the epidermis of old segments of the root that do not absorb water. |
4) During the plant primary growth, the cork cambium produces cork outward.
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| Not answered. It is false. The cork cambium is not present during the primary growth. It is generated during the secondary growth. |
5) The rhytidome consists in dead cells that are found more externally than the cork.
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| Not answered. It is false. The rhytidome consists in tissues located more superficially than the cork cambium. Thus, rhytidome includes the cork. |
6) Lenticels are only present during the secondary growth of plants, replacing the stomata as gas exchange structures.
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| Not answered. It is true. Lenticels are structures of the periderm (secondary growth) that facilitate the gas exchange between the inner tissues and the environment. |
7) The guard cells of stomata show non-uniform thickenings in their cell walls.
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| Not answered. It is true. These non-uniform widenings of the their cell walls allow them to drive the stoma opening. |
8) Trichomes are derived from parenchima cells found just below the epidermis.
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| Not answered. It is false. Trichomes are specialized cells from the epidermis. |
9) The epidermis is differentiated from the protodermis meristem, and the periderm from the cork cambium.
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| Not answered. It is true. |
10) The pore formed by the guard cells od the stoma is known as ostiole.
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| Not answered. It is true. |
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Click the images to enlarge
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F-1) The lines indicate a pluristratified epidermis.
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Not answered. It is false. The epidermis shows a single layes. It is delimited by dots.
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F-2) Arrows point to the guard cells of stomata.
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Not answered. It is true.
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F-3) The arrow points to the stomatal complex.
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Not answered. It is false. The arrow points to the substomatic chamber. The pore complex consists in guard cells, the pore, subsidiary cells, and the substomatic chamber.
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F-4) Points on the left enclose a unicellular trichome and the points on the right enclose a pluricellular trichome. The arrow points to the epidermis.
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Not answered. It is false. A multicellular trichome is on the left and a unicellular trichome on the right. The arrow points to the cuticle.
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F-5) The lines indicate the tissues that form the periderm.
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Not answered. It is false. Periderm does not include the epidermis (click the image to enlarge). Peridermis is made up of felloderm, cork cambium and cork.
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