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Which of the following makes up most of an old tree trunk?
– secondary xylem
– primary phloem
– meristem tissue
– primary xylem
– secondary phloem
1 Answer Which of these tissues is between the epidermis and the vascular bundle in a young dicot stem?
– phloem
– pith
– cortex
– ground tissue
– xylem
1 Answer In a dicot stem, the ________ is between the vascular cambium and the cork cambium.
– vascular cambium
– phloem
– vascular cylinder
– cork
– xylem
1 Answer How is the supply of vascular cambium maintained?
– by the differentiation of apical meristem
– by the differentiation of secondary xylem
– by the division of its cells
– by the differentiation of cork
– by the differentiation of secondary phloem
1 Answer What is the function of cork?
– regulating the opening and closing of stomata
– providing a site for photosynthesis
– providing cells for primary growth
– providing cells for secondary growth
– insulation and waterproofing
1 Answer Vascular cambium forms wood toward the stem’s _____ and secondary phloem toward the stem’s _____.
– surface … center
– center … center
– surface … surface
– top … bottom
– center … surface
1 Answer ____ provides cells for secondary growth.
– Vascular cambium
– Secondary phloem
– Secondary xylem
– Apical meristem
– The root
1 Answer Secondary growth NEVER occurs in _____.
– leaves
– stems and leaves
– roots
– stems
– roots and leaves
1 Answer How does carbon dioxide enter a leaf?
– CO2 is moved by active transport into the leaf by special cells called guard cells.
– CO2 passes through openings called stomata on the leaf surface.
– CO2 diffuses through the epidermal cells into the mesophyll.
– CO2 travels dissolved in the water in the xylem.
– Atmospheric pressure forces CO2 through pits on the leaf surface.
1 Answer What is transpiration in the water cycle?
1 Answer
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