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

Skeletal system - hyoid bone, HYOI D BONE - Also called tongue bone...

HYOI D BONE - Also called tongue bone as lies at the base of the tonuge. One in number. Muscles of tongue and throat are attached to it. Not e :- Except

Explain root amputation, Explain the Root amputation, Hemisectioning and Bi...

Explain the Root amputation, Hemisectioning and Bicuspidization Root amputation: removal of one or more roots of a multirooted tooth "upper teeth". Hemisectioning: surgic

The halstead-reitan neuropsychological battery, The halstead-reitan neurops...

The halstead-reitan neuropsychological battery The beginnings of the battery can be traced to the special laboratory established by Halstead in 1935 for the study of neurosurgi

Define vitamins b12 deficiency in vegans, Define Vitamins B 12 Deficiency ...

Define Vitamins B 12 Deficiency in Vegans? Because plants do not synthesize vitamin B 12 , individuals who consume diets completely free of animal products (vegan diets) are a

Which term explain lack of voluntary control of urination, In studies of hu...

In studies of human body, which of the following terms will be used to explain the lack of voluntary control of urination or voiding of bladder? Is it a) Anuria b) Incontine

Acute aortic regurgitation-types of regurgitation, Acute Aortic Regurgitati...

Acute Aortic Regurgitation :  The most dramatic presentation occurs in dissection of the aortic root. Endocarditis of the native or prosthetic aortic valve may also lead to a

Explain dietetics, Explain Dietetics Dietetics  has been defined as  t...

Explain Dietetics Dietetics  has been defined as  the science and art of feeding individuals based  on the principles of  nutrition. It can also be  said  to  be  the "science

List what organelle is responsible, List what organelle is responsible for ...

List what organelle is responsible for each of these cellular functions. -production of energy (ATP) for the cell -synthesizing proteins -cellular digestion.

Gene therapy vectors, The ultimate aim of somatic gene therapy is to alter ...

The ultimate aim of somatic gene therapy is to alter the genetic material of living cells which involves transfer of DNA. Genetic material is transferred by various methods like us

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