Set up a potometer in the laboratory, Biology

Assignment Help:

A student set up a potometer in the laboratory and measured the rate of movement of water in the capillary. An average of four readings gave a rate of 50mm per minute. The apparatus was then taken outside, where there was a light breeze. Four more readings were taken without delay. The average of these readings was 130 mm per minute.

The student concluded that exposure of the shoot to rapid air movement had increased the rate of transpiration.

Criticise the design of the experiment and the student's conclusions.

 

By taking the second set of readings 'without delay', the student did not permit time for a new rate to become established. The student should either have waited for 5 minutes or, better, kept taking readings unless four of them were nearly the similar.

When the apparatus was taken outside, several variables were altered, e.g. light intensity, temperature, humidity and air movement. There is no way of knowing which of these was contributing to the enhanced transpiration rate. It would have been better to vary just one condition whereas remaining in the laboratory, e.g. moving the apparatus from shade to sunlight.

 

 

 


Related Discussions:- Set up a potometer in the laboratory

Protozoans, what are vhrmful effects of protozoans

what are vhrmful effects of protozoans

.development, what is the function of the larval stage in the development o...

what is the function of the larval stage in the development of the young of five named animals

Which are the structures that are part of the nervous system, Q. Which are ...

Q. Which are the structures that are part of the nervous system? The structures that form the nervous system can be divided into the peripheral nervous system (PNS) and the cen

Explain the functionality of central nervous system, Explain the functional...

Explain the functionality of Central Nervous System ? The central nervous system is the center of the nervous system, receiving impulses from, and sending impulses to, the per

Define body mass index (bmi) or quetelet index, Define Body Mass Index (BMI...

Define Body Mass Index (BMI) or Quetelet Index? BMI is an index measure of body fat used for the assessment of disease risk.  It is a figure which gives an indication of weight

Evolutionary changes in humans, Evolutionary changes that occurred in human...

Evolutionary changes that occurred in humans are - Development of prominent chin. Increase in cranial capacity. Reduction of brow-ridges. Development of speech. Developme

What are the sign of horner''s syndrome, What are the sign of Horner's synd...

What are the sign of Horner's syndrome? 1. Miosis, 2. ptosis, 3. enophthalmos, 4. anhidrosis and 5. heterochrome iridis.

Metalimnion - summer stratification, Metalimnion - Summer Stratification ...

Metalimnion - Summer Stratification This zone lies below the epilimnion and above the hypolimnion and thus forms the intermediate layer which is non-circulating. The metalimni

Intramuscular route of injection, Intramuscular Route of Injection P...

Intramuscular Route of Injection Purpose When rapid action is required.  When drug would prove irritating to the subcutaneous tissue.  Site selected must be whe

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd