Biology HL
4
Chapters
553
Notes
Theme A - Unity & diversity
Theme B - Form & Function
Theme C - Interaction & Interdependence
Theme D - Continuity & Change
Biology HL
Theme C - Interaction & Interdependence
Explore Sigmoid Population Growth: A Study
349 words
2 mins read
Last edited on 16th Oct 2024
Table of content
Introduction
- 🌱 What? Sigmoid growth: A specific pattern of population growth that happens in stages.
- Where? Natural ecosystems.
Model Organisms
-
🍀 Duckweed
- 🏞️ Habitat: Ponds and lakes.
- 🌿 Characteristics: A photosynthetic, stemless water plant. Each tiny floating plant has potentially a single root underneath.
- Reproduction: Asexual. New plants (fronds) grow and separate from the parent.
- 🥤 How to Grow: Place on the surface of water inside beakers or cups.
-
🍞 Yeast
- Habitat: Surface of fruits and other sugar-rich locations.
- Characteristics: Saprotrophic fungus, ovoid cells.
- Reproduction: Asexual. Produces extra cells by budding (thanks to mitosis!).
- 🍻 Fun Fact: This little organism helps us get bread and alcohol!
Experiment Set-Up
- Start with a small population of the organism.
- Ensure tons of resources are available for growth.
- Ensure no other organisms interfere.
- Monitor the numbers either by
- 📈 Datalogging (techy way).
- 🧮 Regular counts (old school but reliable).
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Biology HL
Theme C - Interaction & Interdependence
Explore Sigmoid Population Growth: A Study
349 words
2 mins read
Last edited on 16th Oct 2024
Table of content
Introduction
- 🌱 What? Sigmoid growth: A specific pattern of population growth that happens in stages.
- Where? Natural ecosystems.
Model Organisms
-
🍀 Duckweed
- 🏞️ Habitat: Ponds and lakes.
- 🌿 Characteristics: A photosynthetic, stemless water plant. Each tiny floating plant has potentially a single root underneath.
- Reproduction: Asexual. New plants (fronds) grow and separate from the parent.
- 🥤 How to Grow: Place on the surface of water inside beakers or cups.
-
🍞 Yeast
- Habitat: Surface of fruits and other sugar-rich locations.
- Characteristics: Saprotrophic fungus, ovoid cells.
- Reproduction: Asexual. Produces extra cells by budding (thanks to mitosis!).
- 🍻 Fun Fact: This little organism helps us get bread and alcohol!
Experiment Set-Up
- Start with a small population of the organism.
- Ensure tons of resources are available for growth.
- Ensure no other organisms interfere.
- Monitor the numbers either by
- 📈 Datalogging (techy way).
- 🧮 Regular counts (old school but reliable).
Unlock the Full Content!
Dive deeper and gain exclusive access to premium files of Biology HL. Subscribe now and get closer to that 45 🌟