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Download The leaf الورقة First Question: Choose the correct answer: 1) Petioles
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Transcript
The leaf الورقة First Question: Choose the correct answer: 1) Petioles of these leaves enlarge and their tissues are filled with air to allow the plant float above the water surface : a. Buoyant leaves . b. Grasping leaves . c. Protective leaves . d. Storage leaves . 2) First true leaves to appear on the seedling, usually smaller than the normal leaves : a. Cotyledonany leaves . b. Floral leaves . c. Grasping leaves . d. Prophyllis leaves . 3) Colored leaves modified to protect the flower bud: a. Bract leaves . b. Floral leaves . c. Supporting leaves . d. Grasping leaves . 4) Leaves are arranged opposite at each node, but each pair of leaves is oriented perpendicular the pair at the next node: a. Alternate . b. Opposite . c. Opposite decussate . d. Whorled . 5) In this type of leaves, leaflets are arranged on opposite sides of an elongation axis like a feather : a. Compound palmate . b. Compound pinnate . c. Simple . d. Pinnatipartite . 1 Second Question:Answer with (√) or (×) in the following sentences 1) ( ) Leaves have a relatively long life span as compared to other plant parts. 2) ( ) The phenomenon of Heterophylly is having more than one type of leaf on the same plant. 3) ( ) Evergreen plants drop all their leaves in autumn and winter and look bare. 4) ( ) Scaly leaves cannot perform photosynthesis because they lack chlorophyll. 5) ( ) Stomata of dicotelydons are arranged in parallel rows. 2