14a Prelab 14 Roots, Stems and Leaves

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Lone Star College System, North Harris *

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1406

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Biology

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Apr 26, 2024

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Pre-Lab 14 1 Pre-Lab 14: Roots, Stems and Leaves Others who participated: _____________________________ ROOTS 1. Label the drawings below as a tap root system or a fibrous root system. ______________________ ______________________ a. Which of these is better adapted for collecting surface water? ________________________ b. Which is better at preventing erosion by “binding” topsoil in place? ____________________ c. Which utilizes underground water stored in the water table? ___________________________ d. Which is characteristic of monocots? _________________________________________________ 2. The endodermis is the most distinguishing feature observed in any root cross-section. Color this ring of cells red on both drawings below. Most cells of the endodermis are covered by a waxy Casparian strip. What is its function? ____________________________________________________________________ ______________________ ______________________ 3. In the blanks below each drawing, label the root cross section as monocot or dicot. 4. In the boxes between the drawings, identify the 3 root parts (stele, cortex, epidermis). a. Which part produces root hairs? _______________ What is their adaptive value? ____________________________________________________________________________________ b. Which part contains xylem and phloem? ______________________________ Which type of vascular tissue (xylem or phloem) is toward the outside of the root? ____________________ c. What type of tissue makes up the cortex? ____________________________________________ What is its function? _________________________________________________________________ Name _____________________________

2 Pre-Lab 14 STEMS 5. In the blanks below each drawing, label the stem cross section as monocot or dicot. ______________________ ______________________ 6. In the boxes between the drawings, identify the 3 common features found in all stems (vascular bundle, parenchyma tissue, epidermis). a. Which of these parts produces the waxy cuticle? ____________________ A cuticle is found on stems and leaves but not roots. What is its function on aboveground plant parts? _____________________________________________________________________________________ b. In a vascular bundle, which type of vascular tissue (xylem or phloem) is toward the outside of the stem? ____________________ Each vascular bundle has a sclerenchyma cap. What is its function? _________________________________________________________________ c. In what tissue is starch stored? ________________________________________________________ LEAVES 7. In the blanks below each drawing, label the leaf cross section as monocot or dicot. ___________________ ______________________ 8. In the boxes between the drawings, identify the main parts of all leaves (vein, mesophyll, upper epidermis, lower epidermis). a. Which part produces a waxy cuticle? ____________________________ b. In a vein, which type of vascular tissue (xylem or phloem) is toward the top of the leaf? ____________________________ c. Which layer contains photosynthetic cells? ____________________________ 9. Compare the 2 leaf cross sections. To which type (monocot, dicot) does each of the following apply? a. stomata on both surfaces? ____________________________ b. bulliform cells? ____________________________ c. mesophyll with palisade and spongy layers? ____________________________

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