Which statements describe hydrotropism?

check all that apply.

1 hydrotropism is a plant’s response to light.

2 hydrotropism is a plant’s response to an external stimulus.

3 hydrotropism causes cells to grow longer on one side of the roots.

4 hydrotropism causes cells to grow longer on one side of the stems.

5 hydrotropism causes a plant to grow toward light.

6 hydrotropism causes a plant to grow away from light.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

a. 35°c

b. 25°c

c. 10°c

d. 40°c