100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Summary Investigating transport in plants £4.49   Add to cart

Summary

Summary Investigating transport in plants

 5 views  0 purchase

Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.

Preview 1 out of 1  pages

  • November 2, 2024
  • 1
  • 2024/2025
  • Summary
All documents for this subject (186)
avatar-seller
arabellasherratt
Investigating transport in plants summary notes
18 May 2023 17:24




Ringing experiments
- Section of the outer layers including the protective layer and the phloem is removed
around the complete circumference of the woody stem which is still attached to the re
of the plant
- Region of the stem immediately above the missing ring of tissues swells
- Samples of accumulated liquid in the swollen region are rich in sugars and other dissol
organic substances
- Some non photosynthetic tissues in region below the ring die, others above the ring
continue to grow


Removing the phloem around the stem has led to:
1. The sucrose in the phloem accumulating above the ring leading to swelling
2. The interruption of flow of sucrose to the region below the ring and the death of tissue
this region

- Therefore conclude that it is phloem rather than xylem that is responsible for
translocating sucrose in plants
- Ring of tissue removed had not extended into xylem so its continuous water column w
not broken- if it was the tissue responsible for translocation the sugars would not
accumulate above the ring and the tissues below would not die


Tracer experiments
- Plant grown in atmosphere containing radioactive carbon dioxide
- Carbon 13 isotope is incorporated into sugars produced during photosynthesis
- These radioactive sugars can be traced as they move within plant using autoradiograph
- Ie taking thin cross sections of the plant stem and placing them on piece of X ray film-
becomes blackened where it is exposed to radiation produced by carbon 13 in sugars -
blackened regions correspond with where phloem tissue is in the stem
- Other tissues do not blacken film- do not carry sugars- phloem responsible for
translocation



Evidence that translocation occurs in phloem


1. When phloem is cut, a solution of organic molecules flows out

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller arabellasherratt. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £4.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

73918 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£4.49
  • (0)
  Add to cart