Lab Exercise 6 Flashcards
Which best describes the substance(s) that are transported in the xylem?
Water and mineral ions
What feature of cells in the palisade mesophyll makes them efficient at photosynthesis?
They are packed with chloroplasts.
In which direction are substances transported in the phloem?
upwards and downwards
What is the process that transports substances in the phloem?
translocation
Why might Christmas tree growers spray the trees with a chemical that blocks the trees’ stomata?
To reduce the transpiration rate so they lose less water
How is water lost from the leaves of a plant?
It evaporates from the stomata.
Which of the following best explains the relationship between temperature and the rate of transpiration?
As temperature increases, the rate of transpiration increases because water molecules evaporate from the leaf faster.
Which of the following best explains the relationship between light intensity and translocation?
A higher light intensity means more sugars are made by photosynthesis and thus a higher rate of translocation.
Which type of vascular tissue in a plant is responsible for transporting sugars and amino acids?
Phloem
Use the terms “sources” and “sinks” to complete the following sentence: Translocation is primarily the movement of sugars from ____ to ____.
sources, sinks
Which parts of the plant are sinks of sugars?
Anywhere sugars are used or stored (e.g., the roots)
The absorptive ability of a root is increased by cellular extensions called
root hairs
The ability of a plant to detect and grow towards a light source is called
phototropism
Thermogenesis is primarily used by plants to
better attract pollinators.
Many plants have evolved structures known as thorns which are modified______ or spines, which are modified______
stems and leaves
What structures are extensions of the epidermis that can prevent insect eggs from sticking to a plant, hinder movement by insects, and deter the larger herbivores with their unpleasant texture?
trichomes
