Cells 18 Active transport.Complete powerpoint

This lesson is on cells

1. Active transport DQ - How do substances move when the concentration of substances is low? Starter: Recap what we mean by diffusion Tuesday, 08 June 2021

2. Grading criteria 7-8: explain why active transport is important by using these examples 6: give and describe some examples of where active transport happens 5: define ‘active transport’

3. How are roots adapted to their function? Roots contain thousands of tiny root hair cells , which project out into the soil. The roots of this hyacinth have formed a fine network, filling the available space. T hese features make roots suitable for absorbing water and minerals high surface area to volume ratio maximum contact with the soil firm anchorage.

4. How do minerals enter plants? Like water, minerals enter plants through the roots. However, they do this by different methods. Water passively diffuses with a concentration gradient from the soil into the roots and up the stem. Diffusion cannot take place against a concentration gradient. Minerals are usually found in the soil in lower concentrations than they occur in the plant. Instead, minerals enter the roots by active transport .

5. Active transport uses energy from respiration to move substances against a concentration gradient. What is active transport? Specific minerals from the soil enter through channels in the cell walls of the root hair cells. soil mineral root hair cell

6. 08/06/2021 Plant roots are made of “root hair cells” which have two features that help them to take in water and nutrients (“active transport”): Root hair cells Root hair cells Thin cell membrane Large surface area

7. Active transport

8. 08/06/2021 More on Active Transport In diffusion substances moved along a concentration gradient. In active transport, substances move against this gradient: Outside cell Inside cell This process takes ______ and this comes from ___________. It enables cells to take in substances even though there are in very small __________. Root hair cells take in ______ using active transport. Cell membrane Words – concentration, energy, respiration, nutrients

9. 08/06/2021 Carbon dioxide diffuses into the leaf through holes in the bottom surface. Diffusion and Active Transport in plants More concentrated Less concentrated Mineral …while plant nutrients are taken in by root hair cells using active transport.