4) a) Name the growth hormone in plant
b) State the difference between a positive response
and a negative response.
c) Name the response described below and indicate If it is a negative response.
i, Shoots grow away from gravity
ii, Pollen tubes grow toward the Ovule
iii, Roots grow away from light
5) What is the importance of
a) Phototropism
b) Geotropism

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm