IB Bio HL2 Internal/External Assessment Padlet 2025_2026 by John Marshalek

johnmarshalek — 2025-08-13 16:29:29 UTC

drogers219 — 2025-08-29 16:09:46 UTC

To what extent does exposure to different salinity levels (10 ppt, 20 ppt, 30 ppt, 40 ppt, and 50 ppt) influence the growth rate of Ulva algae over a two-week period?

bgutierrez14_1 — 2025-08-29 16:22:01 UTC

How does varying the concentration of Red Bull (0%, 5%, 10%, 15%, 20%, and 25%) affect the rate of oxygen production in a catalase-mediated reaction from catalase powder?

jbrown821 — 2025-08-29 16:40:50 UTC

How does the concentration (1–5% acetic acid vs. 5–40% garlic extract) affect the antifungal effectiveness of vinegar and garlic extract against Saccharomyces cerevisiae in a disk diffusion assay?

zharris3_5 — 2025-08-29 16:41:25 UTC

How does hand dominance affect simple visual reaction time in human participants?

lguevarra2 — 2025-08-29 17:14:48 UTC

How do different portions of Vaccinium subg. Oxycoccus (0g, 5g, 10g, 15g, 20g) significantly influence the stimulation of pepsin breaking down proteins in milk, measured through protein concentration in a Bradford assay?

imares2_1 — 2025-08-29 17:48:22 UTC

To what extent does soil pH variation influence the distribution and abundance of plant pieces in different zones of the school garden?

llansangan1 — 2025-09-02 16:38:49 UTC

How does increasing the concentration (0%, 25%, 50%, 75%, 100%) of green tea flavonoids affect the activity of the enzyme lipase, as measured by changes in pH?

2025-09-02 16:53:23 UTC

“To what extent do different concentrations of matcha (0, 0.1, 0.2, 0.3, and 0.5 g per 50 mL water) affect antioxidant activity measured by the reduction of potassium permanganate?”

jcabello11 — 2025-09-03 04:49:53 UTC

To what extent does increasing the concentration of calcium nitrate (Ca(NO₃)₂) in irrigation water (0, 50, 100, 200, 400 mg) affect the growth of Raphanus sativus after 21 days?

llopez492 — 2025-09-04 00:06:48 UTC

How does the pH (4,5,6,7, and 8) of agar affect the growth of baker’s yeast (Saccharomyces cerevisiae)

over 24 hours?

jarmas21 — 2025-09-04 14:32:26 UTC

To what extent does the concentration of pectinase(0.1g,0.2g,0.3g,0.5g,and1.0g) affect the hydrolysis of pectin and the resulting juice yield in pineapple(Ananas comosus) at varying stages ripeness?

johnmarshalek — 2025-09-10 16:09:09 UTC

alopez1622 — 2025-09-14 00:54:12 UTC

How does the solute concentration( 0%, 5%, 10%, 15%, and 20%) of the Sodium Chloride(NaCI) solution affect the turbidity of potato(Solanum tuberosum) cell suspension over a 30-minute period using a colorimeter?

johnmarshalek — 2025-09-16 16:35:07 UTC

2025-09-18 19:44:15 UTC

Is there a significant difference in the rate of CO₂ production by yeast among different glucose concentrations

kfranco2_10 — 2025-09-18 20:12:19 UTC

How does the solute concentration ( 2oz, 4oz, 6oz, and 8oz) of sugar in fresh Actinidia Deliciosa Fragaria juice affect the homo sapiens diabetic vs. non diabetic body compared to bottled Actinidia Deliciosa Fragaria juice?

cdael1 — 2025-09-22 16:03:38 UTC

How does exposure to different concentrations of hydrochloric acid (2, 4, 6, 8, 10 mL) affect the ability of coral (calcium carbonate) to maintain structural integrity when emerged for 2 weeks?

gromero416 — 2025-09-24 15:14:05 UTC

Is there a significant difference in the concentration of L-ascorbic acid during its enzymatic degradation from ascorbate oxidase, when stored at different conditions, in oranges?

jcamarillo7_1 — 2025-09-24 15:21:39 UTC

How do increased concentrations of sodium benzoate (0g, 0.0125g, 0.025g, 0.0375g, 0.05g, 0.075g) in a 50 ml water and corn starch solution at a constant temperature of 98°F affect amylase’s ability to break down corn starch into maltose?

jcamarillo7_1 — 2025-09-24 19:46:36 UTC

How do increased concentrations of sodium benzoate(0g, 0.025g, 0.05g, 0.075g, 0.1g, 0.15g) in a 98 degree Fahrenheit 100 ml water and corn starch solution affect amylase’s ability to break down corn starch into maltose?

jdonofrio11 — 2025-09-25 14:45:30 UTC

What level are you on! How does anthocyanin in red cabbage indicate pH levels across different fruit juices( lemon, orange, apple, and grape)?

jtorres47_2 — 2025-09-28 20:32:35 UTC

To what extent does varying UV-A light intensity (measured in µW/cm²) influence the rate of Saccharomyces cerevisiae colony growth on agar plates, as a model for tissue regeneration relevant to reconstructive surgery?

2025-10-03 17:53:06 UTC

To what extent does varying temperature (20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃) affect the separation of photosynthetic pigment, chlorophyll a and chlorophyll b, in Spinacia oleracea, measured by the RF value?

2025-10-09 01:20:32 UTC

To what effect does different pH levels (4, 6, 7, 8, and 10) have on the activity of catalase in potato tissue, as measured by the rate of oxygen gas production.

etrevino2_1 — 2025-10-09 15:05:56 UTC

To what extent does the abundance of Eschscholzia californica, Phacelia spp., Calystegia spp., Encelia californica, and Dudleya pulverulenta differ among various hiking trails in Ventura County, and how can these variations be attributed to specific environmental gradients and anthropogenic influences?

jtorres4610 — 2025-10-10 16:30:06 UTC

To what extent is the effect (2g, 4g, 6g, 8g, 10g) of fructose concentration (IV) on the carbonic anhydride (C02) production rate (DV) of Saccharomyces cerevisiae over the course of a 2-hour period?

2025-10-13 22:07:26 UTC

To what extent does temperature (20°C, 30°C, 40°C, 50°C, and 60°C) affect the rate of anthocyanin degradation in Brassica oleracea var. capitata f. rubra (red cabbage)?

lromero4_9 — 2025-10-14 17:26:56 UTC

To what extent do different protein powders (whey, soy, pea, casein, and rice) affect the rate of Trypsin protein hydrolysis, as measured by changes in pH?

jespinoza19_5 — 2025-10-15 06:55:57 UTC

To what extent does the dose of Moringa oleifera seed powder (25 mg, 50 mg, 100 mg, 200mg per 100 mL water) and the pH of simulated turbid water (6, 7, 8) influence the percentage of turbidity removal?

creferente1 — 2025-11-03 01:01:19 UTC

How does boiling time (0, 1, 3, 5, 10 min) affect the vitamin C concentration in Spinacia oleracea (mg per 100 g) measured by iodometric titration?

lcuilty1 — 2025-11-13 16:01:07 UTC

How does varying caffeine concentration (0%, 5%, 10%, 15%, 20%) affect the rate of lipase-catalyzed hydrolysis of triglycerides in whole milk, measured by the change in pH over time at room temperature?