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Similarities:

Both leaf veins and human blood vessels have a network appearance

Both are involved in the transport of substances

Reason for appearance:

The network of vessels allow more branching, thus increasing the surface area for more efficient transport of substances

Differences:

Leaf vein contain vascular bundles, where the xylem transports water and mineral salt ions, and the phloem transports manufactured food substances

Human blood vessels transport blood, which contains various materials (e.g., blood cells, dissolved nutrients, dissolved gases & waste products, etc.) at different concentrations depending on whether the types of blood vessel
(e.g., arteries, veins & capillaries) and their associated organs.

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A larger leaf blade increases the exposure surface area to sunlight and allows leaves to absorb more light energy for photosynthesis (similar to how larger hands allow us to “grab” more sunlight.

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Longer leaf stalks allows for leaves to reach further out (similar for how longer arms allow a hand to reach further out).

Longer leaf stalks allow the leaf blades of the leaves to be more spread out, which allows them to be more exposed to light so they can absorb more light energy for photosynthesis. Leaves with longer leaf stalks are more well-adapted for photosynthesis

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Arm = leaf stalk.

The leaf stalk holds the leaf blade out, just like how the arm holds the hand out.

Hand = leaf blade.

The leaf blade is where photosynthesis occurs (main function of the leaf). The hand is responsible for most of the functions of the arm

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group 1: Leaves 2 & 3

explanation: Both leaves have a network / branched vein pattern

group 2: Leaves 1 & 4

explanation: Both leaves have a parallel vein pattern

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PUT YOUR GROUP MEMBERS' NAMES AS THE TITLE OF EACH POST

Both leaf veins contains xylem & phloem vessels while human veins are blood vessels.

As a group, discuss and comment on:

1. The similarity between the appearance of leaf veins and human blood vessels in the picture above.

2. The similarities between the function of leaf veins and human blood vessels.

3. Considering their functions, reasons for the similarity in the appearance of leaf veins and human blood vessels.

4. The differences between the function of leaf veins and human blood vessels.

Leave your answer in a new post below.

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PUT YOUR GROUP MEMBERS' NAMES AS THE TITLE OF EACH POST

As a group, consider the advantages of larger hands over smaller ones. Suggest why some leaves have larger leaf blades than others.

Leave your answer in a new post below.

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1. What are the parts of an arm - forearm and hand of a human, equivalent to in a leaf?

2. Consider the parts of an arm - the forearm and the hand. How are their functions similar to that of the parts of a leaf?

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PUT YOUR GROUP MEMBERS' NAMES AS THE TITLE OF EACH POST

As a group,

1. Find and take a clear picture of a dicot leaf from a plant that you can find in school.

2. Label the leaf stalk, leaf blade and a vein.

Post your work in a new post below!

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PUT YOUR GROUP MEMBERS' NAMES AS THE TITLE OF EACH POST

As a group,

1. Observe the four leaves and sort them into two groups. e.g. 1 & 2, 3 & 4

2. Explain your reason for the sorting by comparing the structural features of two groups of leaves.

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In our syllabus, we will focus on leaves of dicot(yledonous) plants. Consider the labelling of two dicot leaves below.

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PUT YOUR GROUP MEMBERS' NAMES AS THE TITLE OF EACH POST

As a group, consider the advantages of longer arms over shorter ones. Suggest why some leaves have longer leaf stalks than others.

Leave your answer in a new post below.