BIO questions?

Question

a few multiple choice bio questions.. PLEASE HELP.. if u can explain as well, that'd be great

1) the following factors may sometimes play a role in the movement of sap through xylem. Which one depends upon the direct expenditure of ATP by the plant?
a) capillarity of water within the xylem
b) evaporation of water from leaves
c) cohesion among water molecules
d) concetration of ions in the symplast
e) bulk flow of water in the root apoplast

2) in which plant tissue would the pressure component of water potential often be negative?
a) leaf mesophyll
b)root epidermis
c)root cortex
d) stem xylem
e) stem phloem

3) in which of the followin is a vascular cabium most likely to be found?
a) herbaceous dicots only
b) woody dicots only
c) a and b

4) all of the following are advantages of seeds except
a) choice of germination location
b) dispersal
c) dormancy
d) a nutrient supply for the embryo

Answer 1

1 d
2 d
3 b
4 a

Answer 2

1. Can you think of any examples of those choices that take place outside the plant? For instance, have you ever put a straw in a drink and had the water level inside the straw rise higher than the water level of the drink? That's capillary action. Does it require an outside energy source (remember, ATP is like a battery for living organisms)? I bet you can eliminate some of the choices pretty easily and you should be able to figure out which is the most likely answer.
2. hmm - it's been too long since I did botany; you're on your own for this one, sorry.
3. Do you know what a 'vascular cambium' is? That would give you a good clue right there.
4. Think of a seed as like a plant egg; it's designed to do several things between the time it's made and the time the sprout unfolds its leaves and begins photosynthesizing. Three of your choices are things the plant can to some degree control via the seed. The fourth choice is pretty much random, and one that the seed can have very little or no affect on.

Answer 3

A saturated fat is a fat that is solid at room temperature and comes chiefly from animal food products. An unsaturated fat is a fat that is liquid at room temperature and comes from a plant such as olive, peanut, corn, cottonseed, sunflower, safflower, or soybean (tend to lower the level of cholesterol in the blood). A polyunsaturated fat is a fat or oil based on fatty acids such as linoleic or linolenic acids which have two or more double bonds in each molecule; corn oil and safflower oil are examples.