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More about my Plant: Lab Project Questions (1)

Gas Exchange

1. Where are the stomata located?
2. On which surfaces?
3. What are the shapes of cells in the epidermis (guard cells, subsidiary cells, ordinary epidermal cells)?
4. How many stomata are there per square millimeter?
5. How do you know the diameters of the fields of view?
6. Are the stomata located in the depressions?
7. What is the nature of the cuticle (thick or thin)?
8. Are the epidermal hairs present?
9. What is their structure?
10. Is the epidermal layer unicellular or multicellular?

About my plant

This is my houseplant, which is a Pothos. I brought it here because there is more sunlight. And, my cat kept eating its leaves. It was in my room.

Common name: Variegated Pothos.

Devil's Ivy, Silver Vine, Money plant in some parts of the world.

Philodendron is an incorrect name.

Scientific name: Epipremnum aureum.

Kingdom: Plantae, Division: Magnoliophyta, Class: Liliopsida, Order: Alismatales, Family: Araceae, Subfamily: Monsteroideae, Genus: Epipremnum, Species: E. aureum

Color: Green, due to abundance of chloroplasts.
White marbled as well. The white marbling can sometimes be yellow.

Features: Lenthy stems, leaves
Stems are lined with root nubs.
Heart shaped leaves
Size of leaf ranges from long and narrow to short and fat.

Conditions/Tolerates:
Pothos needs medium indirect light, however it can tolerate small amounts of bright light. Too much bright light will scorch the leaves. This is a very hardy plant that can withstand mistreatment. Needs moderate watering. Prefers a temperature of from 17C to 30C, or 63C to 86C.

Can grow hydroponically.

Pictures:

Stem

Leaf



Root


More information:
Stems can grow to 20m in length, and 4cm in diameter. Aerial roots hook over tree branches. These roots can also grow into ground roots. The leaves are evergreen, and are larger on younger plants. Leaves are typically under 20cm long.
This is a popular houseplant. Cultivars select it for white, yellow or light green marbled look. It is a very hardy plant that requires little maintenance. This plant is effective in removing indoor pollutants, especially artificial ones such as formaldehyde.

Another picture of my Epipremnum aureum.

Lesson 38, Dicotyledonous Plant Structures/ Unit 7, Plant Science

Chapter 35, lesson 48

This Is Justin's IB biology hl2 blog.
This is where IB biology stuff will go.

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Lesson 38, Dicotyledonous Plant Structures/ Unit 7, Plant Science

1. Outline the wide diversity in the plant kingdom as exemplified by the structural differences between bryophytes, filicinophites, coniferophytes, and angiospermophytes.

Bryophytes (mosses and liverworts):
No roots, vascular system, or cuticle.
Rhizoids similar to root hairs.
Mosses with simple leaf-like structures.
Liverworts have flattened shape called a thallus.

Filicinophytes (ferns):
Roots, leaves in fronds, and vascular system.
Cuticle on leaves.
Can form small trees but not woody.
Coniferophytes (conifers):
Shrubs to very large trees.
Advanced vascular system.
Woody stems and roots.

Angiospermophytes (flowering plants):
Highly variable in structure-tiny herbaceous to large trees
Roots, stems and leaves.
Advanced vascular system.
Can form woody tissue.

2. Draw a diagram to show the external parts of a named dicotyledonous plant including root, stem, leaf, axillary and terminal buds.

Atropa Bella-donna

[to be scanned]

3. Draw a plant diagram to show the distribution of tissues in the stem, root, and leaf of a generalized dicotyledonous plant.

Stem

Root

Leaf

4. Explain the relationship between the distribution of tissues in the leaf and the functions of these tissues.

Tissues of the Leaf and their functions

- Palisade mesophyll: Densely packed cylindrical cells with many chloroplasts. This is the main photosynthetic tissue. It is near the upper part of the leaf.

- Upper epidermis - continuous layer of cells covered by thick waxy cuticle. Prevents water loss.

- Xylem: Pore that brings water to replace losses due to transpiration

- Phloem: Pore that transports photosynthesis products from leaf.

- Guard Cells: pair of cells open and close the stroma. Controls transpiration.

- Stoma: pore that allows CO2 out and 02 in.

- Spongy mesophyll: loosely packed round cells with few chloroplasts. Main area where gas exchange occurs.

5. Outline four adaptations of xerophytes.

- Spines instead of leaves to reduce transpiration.

- Thick stems containing water storage tissues

- Vertical stems to absorb sunlight early and late in the day, but not at midday when the light is most intense.

- Very wide sperad network of shallow roots to absorb water after it rains.

6. Outline two structural adaptations of hydrophytes.

- Air spaces in the leaf to provide buoyancy.

- Stomata in the upper epidermis of the leaf, which is in contact with the air, but not in the lower epidermis.

- Waxy cuticle on the upper surface of the leaf but not on the lower surface, which is in contact with the water.

- Small amounts of xylems in stems and leaves.