Which pigment traveled the farthest on the chromatography paper?

The picture shows a thin layer chromatogram of an extract of leaves of annual meadow grass (Poa annua). Plastic sheets were coated with silica gel. A drop of extract was spotted at the bottom of the sheet. The sheet was then placed in a beaker of solvent [$75\%$ acetone and $25\%$ petroleum ether].

Identify the most soluble pigment.

The picture shows a thin layer chromatogram of an extract of leaves of annual meadow grass (Poa annua). Plastic sheets were coated with silica gel. A drop of extract was spotted at the bottom of the sheet. The sheet was then placed in a beaker of solvent [$75\%$ acetone and$25 \%$ petroleum ether].

Calculate the $R_f$ for phenophytin. Show your working.

The picture shows a thin layer chromatogram of an extract of leaves of annual meadow grass (Poa annua). Plastic sheets were coated with silica gel. A drop of extract was spotted at the bottom of the sheet. The sheet was then placed in a beaker of solvent [$75\%$ acetone and $25\%$ petroleum ether].

Suggest what would have happened to the pigments of the solvent has been different.

Glass jars containing cultures of chlorella vulgaris microalgae were used as mesocosms. The carbon dioxide released from the combustion of the waste was pumped into the jars to promote photosynthesis and therefore growth of the algae. The jars were kept at $25°C.$ State one other condition required in this mesocosm.

Glass jars containing cultures of chlorella vulgaris microalgae were used as mesocosms. The carbon dioxide released from the combustion of the waste was pumped into the jars to promote photosynthesis and therefore growth of the algae. The jars were kept at $25°C.$ Identify, with a reason, whether this is an open or closed mesocosm.

Glass jars containing cultures of Chlorella vulgaris microalgae were used as mesocosms. The carbon dioxide released from the combustion of the waste was pumped into the jars to promote photosynthesis and therefore growth of the algae. The jars were kept at $25°\mathrm{C}$

One of the jars was kept at a temperature of $30°\mathrm{C}$. Suggest a difference that could be seen in this jar with respect to the rest of the jars.

The growth of the axon and one dendrite were measured in a developing neuron. The graph shows the length of the axon and dendrite from the tip to the cell body over time.

(a) State the process occurring in this neuron from day 1 to day 7 .

The growth of the axon and one dendrite were measured in a developing neuron. The graph shows the length of the axon and dendrite from the tip to the cell body over time.

Calculate the difference in length of the axon and dendrite after 7 days growth.