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

Describe the two kind of fermentation, Q. What are the two kind of fermenta...

Q. What are the two kind of fermentation? What are their complete chemical equations? The two major types of fermentation are alcoholic fermentation and lactic fermentation.

The cell, how autophagy help in converting a tadpole larva into adult amphi...

how autophagy help in converting a tadpole larva into adult amphibian

Explain the potassium conductance, In a neuron at rest, the membrane A....

In a neuron at rest, the membrane A. voltage will be less than zero. B. sodium conductance is greater than the membrane potassium conductance. C. voltage is less than the

Define the process of dough formation, Define the process of Dough Formatio...

Define the process of Dough Formation? You already know that gluten is the protein found in wheat. A unique property of gluten proteins of wheat grain endosperm (and to a lesse

Does thermal inversion occur in the winter or in the summer, Q. Does therma...

Q. Does thermal inversion occur in the winter or in the summer? The Pollutant low altitude thermal inversion take place in the winter and in this period of the year the sun hea

Define investigative techniques in nutritional biochemistry, Define Investi...

Define Investigative Techniques in Nutritional Biochemistry? It is an important component of this manual as it focuses on providing an understanding of biochemical methods, tec

Define protein requirements of infants, Define Protein requirements of infa...

Define Protein requirements of infants? Protein allowances of infants should meet both growth and maintenance requirements. Protein allowances are computed from the protein con

Advantages of autonomous transactions, Advantages of Autonomous Transaction...

Advantages of Autonomous Transactions An autonomous transaction, once started is fully independent. It shares no locks, resources, or commit-dependency with the main transacti

Define age as a determinants of nutrient requirements, Define Age as a dete...

Define Age as a determinants of nutrient requirements? Age: Requirements change with increasing age between birth and maturity. Nutrient requirements per unit body weight are h

What do you mean by acute pericarditis, What do you mean by Acute Pericardi...

What do you mean by Acute Pericarditis? Ans. Acute pericarditis is defined as acute inflammation of the pericardium and is clinically characterized by chest pain, fever, t

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