B4 07-nitrates and active transport

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Nitrogen cycle

Use the text book (pg 84)to complete the nitrogen cycle diagram

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Nitrates and active transport Learning outcomesexplain how nitrogen is taken up by plants as nitrates and used to make proteins (grade C)Answer a 6 mark question with at least 4 marks (grade C)H: describe the process of active transport in relation to the uptake of nitrate ions by plants (grade A*-C)

Keywords- nitrate ions, active transport, minerals, concentration gradient, amino acid, insoluble, starch grains, root hair cells

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Why do plants need nitrogen?Plants need nitrogen to make protein units- amino acids, nitrogen combines with hydrogen, oxygen and carbon from glucose

glucose also provides energy

The nitrogen comes from the minerals in the soil

How does nitrogen get into the soil?

whiteboards

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Plants get their nitrogen in the form of nitrates from the soil, taken up by their roots

Fertilisers contain nitrogen and phosphates

How are plants adapted to get as many nutrients from the soil as possible?

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Plant roots have a very large surface area to help them absorb water and minerals. Tiny root hair cells take in minerals, such as nitrates, by active transport

How are root cells specialised for their job?

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Nitrate ions are found dissolved in soil water, and in rivers and seas.

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What is active transport?

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Movement of molecules across a cell membrane by active transport (schematic)

Use the textbook (pg119) to complete the worksheet

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Movement of molecules across a cell membrane by active transport (schematic) answers.

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Remember, the cycling of nitrogen through soil (nitrates) into plants (proteins) and animals (when they eat the plant protein). At each stage, decomposers break down proteins to recycle the nitrogen.

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The 6 mark question

Explain why and how plants take nitrates from the soil. Include in your answer a discussion of the use of nitrates, the role of active transport, and the design of the roots.The quality of your written answer will be assessed. (6 marks)

complete the relevance sheet

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In small groups discuss the answer to the 6 mark question, then attempt to complete the question to gain the full 6 marks

Don’t forget these tips:

Write a list of relevant keywordsUse bullet points- but write in full sentences

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Use the answer sheet to mark your own answer

Then evaluate you answer and add a target for next time at the bottom of the sheet

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reviewing learning outcomes use scale of 1-10 to decide how close are you to achieving them?

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HomeworkResearch ‘legumes’, plants that can fix nitrogen. Write an encyclopaedia entry for legumes