Biology SL
4
Chapters
553
Notes
Theme A - Unity & Diversity
Theme B - Form & Function
Theme C - Interaction & Interdependence
Theme D - Continuity & Change
Biology SL
Theme B - Form & Function
Uncover Dicotyledonous Root Structures!
351 words
2 mins read
Last edited on 5th Nov 2024
Table of content
Tissue placement in the root 🌟
- Unlike the stem, in dicotyledonous plants, the root places its vascular tissues in the center.
- Picture it like a star
- Xylem forms the solid part of the star.
- Phloem fills in the spaces between the star points.
Let's dive deep into the cells! 🚀
-
Xylem
- Job: Transporting water.
- Spot them by
- Big size.
- Thick, robust walls.
- Rounded shape when looking from the top (transverse view).
- Fun Fact: In microscope images, xylem might be the ones partying in red dresses because their walls are lignified (meaning they have lignin which provides strength).
-
Phloem
- Job: Transporting nutrients.
- Features
- Definitely more petite than xylem.
- Rocking thinner walls.
-
Epidermis
- Job: Outer protective layer.
- Cool Feature: Might have tiny root hairs sticking out, like nature's version of hair extensions! These help the root to absorb more water and nutrients.
-
Cortex
- Found between the party-central vascular tissues and the outside-dressed epidermis.
- Features
- Larger cells, but...
- ...with walls so thin, you'd think they're on a diet!
Colors in microscopy 🎨
- Xylem cells = 🟥 (red) due to lignification.
- Other cells = 🔵 (blue) because they are NOT lignified.
Unlock the Full Content! 
Dive deeper and gain exclusive access to premium files of Biology SL. Subscribe now and get closer to that 45 🌟
Biology SL
Theme B - Form & Function
Uncover Dicotyledonous Root Structures!
351 words
2 mins read
Last edited on 5th Nov 2024
Table of content
Tissue placement in the root 🌟
- Unlike the stem, in dicotyledonous plants, the root places its vascular tissues in the center.
- Picture it like a star
- Xylem forms the solid part of the star.
- Phloem fills in the spaces between the star points.
Let's dive deep into the cells! 🚀
-
Xylem
- Job: Transporting water.
- Spot them by
- Big size.
- Thick, robust walls.
- Rounded shape when looking from the top (transverse view).
- Fun Fact: In microscope images, xylem might be the ones partying in red dresses because their walls are lignified (meaning they have lignin which provides strength).
-
Phloem
- Job: Transporting nutrients.
- Features
- Definitely more petite than xylem.
- Rocking thinner walls.
-
Epidermis
- Job: Outer protective layer.
- Cool Feature: Might have tiny root hairs sticking out, like nature's version of hair extensions! These help the root to absorb more water and nutrients.
-
Cortex
- Found between the party-central vascular tissues and the outside-dressed epidermis.
- Features
- Larger cells, but...
- ...with walls so thin, you'd think they're on a diet!
Colors in microscopy 🎨
- Xylem cells = 🟥 (red) due to lignification.
- Other cells = 🔵 (blue) because they are NOT lignified.
Unlock the Full Content!
Dive deeper and gain exclusive access to premium files of Biology SL. Subscribe now and get closer to that 45 🌟
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