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Beach Channel High School
Dr. David Morris, Principal

The Living Environment Laboratory Study Guide

The Living Regents Examination is at 9:00 a.m. on Friday January 26, 2007

Lab Activity 1 - Relationships and Biodiversity In this lab, students are introduced to classification and the importance of biodiversity. Organisms are according to similar characteristics. Some of these characteristics are physical (structural) and others are Biodiversity is the amount of the different organisms in a given area. Students learn that an important cancer curing drug is found in Botana curus, a slow growing plant that endangered list. They must examine three plentiful similar species to determine which one is most similar to curus . It is hoped that this plant will also produce curol, the cancer curing drug.

classified chemical. is on the Botana

Lab Procedure: The students first compared the structural characteristics of the plants to try to determine which species was the closest structurally to Botana curus . • Students examined the structural (physical) characteristics of the leaves of these plants to determine which one is structurally closest to Botana curus . (Leaves are actual size.)

Physical factors deal with the form or structure of the leaf. The physical factors of a leaf include its size & shape, color, and venation (How are the veins organized?). Fill in the following table: Leaf Species BC Color Light Green Size & Shape Venation Veins connected to center vein branch off to sub-veins All veins are directly connected to center vein All veins are directly connected to center vein Veins connected to center vein branch off to sub-veins

Species X

Dark Green

Species Y

Medium Green

Species Z

Light Green

Base on the physical characteristics of the leaf, which species appears to be most similar to Botana curus? Explain your answer.

© 2006 Gregory Arnold - Study Guide - The New Labs Page: 2



Students examined the structural (physical) characteristics of the seeds of these plants to determine which one is structurally closest to Botana curus. (As viewed under a dissecting microscope at 10X.)

Physical factors of a seed include its size & shape, color, and distinguishing marks such as the scaring where it was attached to the plant. Fill in the following table: Seed Species BC Color Beige Size & Shape Distinguishing Marks

Species X

Green

Species Y

White

Species Z

Black

Base on the physical characteristics of the seed, which species appears to be most similar to Botana curus? Explain your answer.



Students used a microscope to examined the internal structural characteristics of the stems of these plants to determine which one is structurally closest to Botana curus. (Viewed under a microscope at 50X power.)

Physical factors of a stem include the size, shape and placement of its vascular bundles. Because these prepared slides of stems were stained to make the vascular bundles more clear, their color is not significant. (Note: Some of the bundle cell walls are so thin, that they are hard to distinguish from the other cells of the stem.)

© 2006 Gregory Arnold - Study Guide - The New Labs Page: 3

Fill in the following table: Stem Species BC Vascular Bundle Size & Shape Vascular Bundle Placement

Species X

Species Y

Species Z

Base on the physical characteristics of the stem, which species appears to be most similar to Botana curus? Explain your answer.



Based on all of the observed physical (structural) characteristics, hypothesize which plant was most similar to Botana curus. Why?

After comparing the physical characteristics of the plants, the students compared the chemical (molecular) characteristics to try to determine which species was the closest molecularly to Botana curus. • Students used paper chromatography to separate the plant pigments to determine which plant has the most similar plant pigments of Botana curus.

Base on...
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