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

Types of neural networks, Types of Neural networks Neural networks can...

Types of Neural networks Neural networks can be grouped into: Sensory filter networks that are organised so as to pass on only certain features of a complex senso

Explain adverse effects of ritonavir, Explain Adverse effects of ritonavir ...

Explain Adverse effects of ritonavir - Adverse reactions are common to full doses of ritonavir, but less common with the low doses used in PI combinations. Ritonavir can cause

Orthopedics, 1. List alternative therapies for musculoskeletal problems. ...

1. List alternative therapies for musculoskeletal problems. 2. What is a xyrospasm? What is the Greek derivative of the word? 3. Name and describe the three types of varus con

Explain cephalosporin, Explain cephalosporin Third-generation cephalosp...

Explain cephalosporin Third-generation cephalosporins, like cefotaxime  (Claforan), ceftriaxone  (Rocephin), cefoperazone  (Cefobid), ceftazidime (Fortaz, and others), or cefti

Five kingdom classifications, Five Kingdom Classifications Biology, as...

Five Kingdom Classifications Biology, as you know, is the study of life, living things, and their relationship to one another and to their environment. This branch of Science

Pattern of cleavage, define the pattern of cleavage i all aspects

define the pattern of cleavage i all aspects

Predict whether narrowing or widening of the blood vessels, Body temperatur...

Body temperature is homeostatic ally regulated around a set point. Given your knowledge of negative feedback and homeostatic control system, predict whether narrowing or widening o

Important concepts in developmental biology, DEFINITIONS E mbryolog...

DEFINITIONS E mbryology - Study of embryo is called as embryology. Zygote to emrbyo in uterus Developmental biology - Study of pre natal period & post natal period

What are Modes of Nutrition, What is Nutrition? Explain types of nutrition?...

What is Nutrition? Explain types of nutrition? Nutrition - Taking Nutrients from environment Nutrients - Substances which are needed for the sources of chemical potential en

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