Transport in Plants

Question 1

Explain 3 reasons in detail for a need of a transport system in plants

Answer 1

1 - Metabolic demands = Chloroplasts in a plant create their own glucose and oxygen through respiration, however the roots that do not photosynthesise need to have these transported to them. Hormoanes need to be transported to site of effect and mineral ions absorbed by the roots needs to be transported all over the cell, required to making enzymes, proteins and maintaing cell structure

2 - Size = Plants can grow to be very tall and need a good transport system that allows the delivery of water and nutrients up and down the plant

3 - SA : V ratio
Leaves have quite a large SA:V ratio, however the rest of the plant does not for example the stem. The SA:V ratio of a plant is not simple and so it can’t rely on diffusion

Question 2

What is a dicotyledonous plant

Answer 2

A plant that seeds make two cotyledons, organs that act as a food store for the developing plant embyro and they also produce the first leaves when the seed germinates

Question 3

What are the different types of dicots

Answer 3

Herbaceous (soft) and Arborescent (woody)

Question 4

Draw the vascular bundle tissue in a herbescous dicot stem

Answer 4

Vascular bundles should surround the edge of
the plant to provide structural support, phloem should be closer to the edge and xylem should closer to the middle with parenchyma tissue in the middle of them both

Question 6

Draw the structure of vascular bundles in roots or a herbaceous dicot

Answer 6

vascular bundles are in the middle of the plant to withstand tugging strain from the leaves and stems the xylem is shaped like a four spike star with the phloem in 4 small circles that each sit inbetween a spike

Question 7

Draw the structure of a dicto herbaceous cross-section of a leaf to show vascular tissue

Answer 7

Vascular tissue circle should be within a large vein on the bottom of the cross section with the xylem labeled on the top of the circle and phloem on the bottom