A student writes five lines about biofertilisers…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A student writes five lines about biofertilisers. Two of them are wrong.
- Rhizobium lives in the root nodules of legumes.
- Azotobacter lives in root nodules, and it fixes nitrogen only there.
- The fungus of a mycorrhiza brings phosphorus from the soil to the plant.
- Cyanobacteria are autotrophic microbes.
- Glomus is a mycorrhizal fungus that fixes atmospheric nitrogen for the plant.
- Which two lines are wrong?
- Write each of them correctly.
Need a reminder? The key ideaShow
Rhizobium lives in the root nodules of legumes and fixes nitrogen. Azospirillum and Azotobacter are free-living nitrogen fixers. Mycorrhiza, as in Glomus, bring phosphorus from the soil. Cyanobacteria are autotrophic nitrogen fixers of paddy fields. Urea is about nitrogen by mass, so the mass of urea is the mass of nitrogen divided by .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Line 2 is wrong. Azotobacter is a free-living bacterium. It does not need root nodules.
Step 2. Line 5 is wrong. Glomus brings phosphorus from the soil. It does not fix nitrogen.
Step 3. The other lines. Line 1 is right. Line 3 is right. Line 4 is right.
Answer: (a) lines 2 and 5. (b) Azotobacter is free-living and adds nitrogen to the soil. Glomus passes phosphorus to the plant.
Discussion (0)
Log in to join the discussion.
Loading…