Catalase is an enzyme that is found in living tissues that helps speed the spontaneous decomposition of the substrate, hydrogen peroxide, H202, into water and oxygen, as hydrogen peroxide, a toxic metabolic byproduct, is produced. In my
experiment, I derive catalase from a potato.
H202 + catalase - catalase + H2O + O2
My results were as follows:
Tubes
1: water + mashed potato
2: mashed potato + hydrogen
peroxide
3: mashed potato + sucrose
Reaction (indicated by bubble column height in mm)
0 mm
20mm
Omm
Why are bubbles being produced in the tube? What exactly are the bubbles?

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

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.

the correct answer in apex is tissue development, i know because i just had this question