MYTUTOR SUBJECT ANSWERS

319 views

The surface run-off of nitrate from agricultural fertiliser into freshwater ponds and lakes can cause the death of the fish. Explain how this happens.

This question crops up a lot and may be up to a five mark question, if you learn the key points and terms you can be confident of getting all the marks you can here! 

First of all, an algal bloom occurs which blocks light from penetrating into the water. Algae can grow rapidly if nitrate, a food source, is less of a limiting factor.

Because the light can't reach the underwater plants they die as they can't photosynthesise (meaning they can't make the sugars vital for life).

The saprobiotic microorganisms  have aerobic respiration, so they use up oxygen in the water. Because the plants in the water have died, the oxygen levels can't be maintained. 

This results in the death of the fish that the question asks about because there isn't enough oxygen in the water for them to respire. 

Sarah M. GCSE Biology tutor, GCSE Chemistry tutor, GCSE Maths tutor, ...

1 year ago

Answered by Sarah, who has applied to tutor A Level Biology with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

119 SUBJECT SPECIALISTS

£22 /hr

Greg H.

Degree: Biomedical Science (Infectious Diseases) (Bachelors) - Edinburgh University

Subjects offered: Biology, French+ 1 more

Biology
French
English

“ About Me Hi! I'm Greg. I'm currently studying Biomedical Science at The University of Edinburgh, and I have a real passion for science and especially biology. I offer tuition in Biology and French from absolute beginners...”

£20 /hr

Josh M.

Degree: Biological Natural Sciences (Bachelors) - Cambridge University

Subjects offered: Biology, Physics+ 3 more

Biology
Physics
Maths
Chemistry
-Oxbridge Preparation-

“Who am I? I'm currently studying Natural Sciences in my third year at Cambridge University, with a focus on Neuroscience. Science is my passion, I've loved it at every level I've studied it, and a desire to pass on my passion is part ...”

£20 /hr

Luke C.

Degree: Biological Sciences with a year in professional placement (Bachelors) - Exeter University

Subjects offered: Biology, Maths+ 1 more

Biology
Maths
Chemistry

“My greatest passion is for biology, but I have always enjoyed studying chemistry and mathematics too. Studying these subjects has supported me during my time so far at Exeter University, even though I am still in my first year of stud...”

About the author

£20 /hr

Sarah M.

Degree: Biological Sciences (MSci) (Bachelors) - Bristol University

Subjects offered: Biology, Physics+ 4 more

Biology
Physics
Maths
Geography
Chemistry
-Personal Statements-

“I'm studying for an MSci in Biological Sciences at Bristol Univeristy. I am patient and I've been told that I'm good at explaining things (and I'm not scary, don't worry!). How I Tutor In the sessions you can guide what we cover; I w...”

MyTutor guarantee

You may also like...

Posts by Sarah

Can you make 'p' the subject of the following equation? 4(p-2q)= 3p+2

The surface run-off of nitrate from agricultural fertiliser into freshwater ponds and lakes can cause the death of the fish. Explain how this happens.

Other A Level Biology questions

How does PCR work?

Explain the sliding filament theory

Outline the roles of synapses in the nervous system

(Briefly) describe the four phases of aerobic respiration?

View A Level Biology tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok