Bio Lab
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What is the difference between the arrangement of vascular bundles in monocot and dicot stems? Do you think that this different can impact the function of the whole stem?
In monocots the xylem is on the inside the phloem is on the outside and the vascual bundle is scattered thoughout with no clear arrangment. In dicots the xylem is on the outside and the phloem is on the inside and the vascular tissue has a clear ring arrangment. Yes, this would cause a change in function because the dicot would be able to grow bigger.
What is the general function of phloem?
Phloem move sugars formed in the leaves by photosynthesis to the rest of the plant for cell use and food.
Where is food stored in the stem?
Usually stems are not known for storing food but here are some food-storing stems include such specialized forms as tubers, rhizomes, and corms.
What is the general function of xylem?
Xylem channels move water and nutrients up from the roots.
Which part of the stem tissue is "wood" made from?
Xylem,phloem and cork.
Where is food stored in roots?
Food is stored in tuber.
How are the guard cells different from other epidermal cells?
Gaurd cells have chloroplast and other epidermal cells do not, gaurd cells are much smaller than other epidermanl cells, gaurd cells walls are not uniform throughout while epidermal cells are unfiromly thin throughout.
What is the function of the stomata? Why are they found only on the underside of the leaf?
The Stomatas main function is to allow gas exchange through pores in the leaves. The stoma opens and closes in the envrionment and is partially activated by sunlight and cause them to open. They are found on the bottom of the leaves because they are paritally activated by sunlight and the sun would cause them to stay open and lose water to the environment, so they are found on the bottom for maximum water absorptiona and gas exchange.
Leaf and stem epidermis is covered with a waxy cuticle, but root epidermis is not. Why is the cuticle not required by roots?
The roots are not covered by this waxy cuticle becuase the roots are responsible for water uptake and if the roots havw a waxy cuticle the plant would not be able to get water.
Why do root cells require oxygen?
The roots are still part of the plant and need oxygen for respiration and to survive.
What are the functions of the air spaces near the lower surface of the leaf?
The air spaces main function is for storing water and corbon dioxide neccessary for photosynthesis.
Why do you think that the basic angiosperm leaf is flat? How does this adaptation come at the expense of another valuable commodity, water?
The basic angiosperm leaf is flat becuase it is maximizing the space for absorbing the sunlight in the environment. The leaves are thin and flat so they are not able to hold as much water.
Explain the function of guard cells. How are they different from other cells on the lower epidermis?
The gaurd cells are important because they are found on the undersurface of the leaf and control gas exchange and water loss. They also help open and close during respiration at the time of photosynthesis. Gaurd cells have chloroplast and lower epidermis cells do not. I have listed more reasons below.
What is the purpose of root hairs?
The main purpose is to absorb water and minerals in from the soil. They increase the root surface area.
What is the function of the waxy cuticle covering the epidermis of leaves and stems?
The waxy cuticle is a impermeable layer that prevents loss of water to the air. Depending on the envrionment they will have a thin layer(tropical) or a thick layer(desert).