Page 75 - SUBSEC October 2017_Neat

UNIT 2
MODULE 2: BIOSYSTEMS MAINTENANCE (cont’d)

SPECIFIC OBJECTIVES EXPLANATORY NOTES SUGGESTED PRACTICAL
ACTIVITIES

2. Transport in the Phloem

Students should be able to:

2.1. relate the structure of sieve Label pertinent features in Make diagrams of sieve
tubes and companion cells to an electron micrograph of tubes and companion cells
their function; a sieve tube and from prepared microscope
companion cell. slides.

2.2. explain how phloem loading
in the leaves occurs against
a concentration gradient;
and,

2.3. discuss the mass (pressure) Experimental evidence
flow hypothesis as a for and against this
possible mechanism of hypothesis.
translocation.

3. The Circulatory System of Mammals

Students should be able to:

3.1. describe the structure of the Use fresh or preserved Make drawings of whole
heart, arteries, veins, specimens (to emphasise mount and/or longitudinal
capillaries, erythrocytes and the 3-D structure); sections of the heart.
leucocytes, relating their prepare annotated Prepare diagrams of
structures to their functions drawings. arteries, veins, erythrocytes
and leucocytes from
prepared microscope slides.

3.2. explain the cardiac cycle
and its initiation;

3.3. discuss the internal factors
that control heart action;

3.4. discuss factors affecting Definition of the terms Measurements before and
blood pressure; blood pressure and pulse. after exercise.

CXC A10/U2/17
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