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Living Environment Regents Review Practice Laboratory Skills Question 3 PDF Print E-mail
Sunday, 28 June 2009 12:47

To study the structure of phloem and xylem tissue, sections can be prepared and observed under a:

A) Centrifuge

B) Triple beam balance

C) Incubator

D) Microscope

Correct Answer: Option D – Microscope

To observe the small structures such as cells, tissues, etc., it would be necessary to observe them with an increase in magnification.

Incorrect Answers:

A centrifuge is equipment, driven by a motor that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis. The centrifuge works using the sedimentation principle, where the centripetal acceleration is used to evenly distribute substances of greater and lesser density. It can be used for viable counts, when shaking the culture e.g. yeasts, out of suspension.

A triple beam balance is a type of balance commonly used in the laboratory to determine the mass of items. Sliding weights called riders on three beams are used.

Incubator is a laboratory instrument used to maintain a bacterial culture at a particular temperature for a set length of time.

Hence, options A, B and C are incorrect.

Last Updated on Thursday, 02 July 2009 07:07
 

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