Question

A biology class wants to perform an experiment to investigate the effect of different colors of light green, yellow, red and clear cellophane and plant 3 seeds in each one. What part do the 3 seeds represent?

1. confounding variables

2. independent variables

3. control variables

4. dependent variables

which of the following is generally expected to be true about birth rate In relation to death rates for a country with growing population and high infant mortality?

a variable compared to death rates

b equal to the death rate

c lower than death rate

d higher than death rate

which of the following is the first step a researcher should take before experimentation begins?

select lab equipment

generate a hypothesis

design experimental

apply the units of the SI system

Answer 1

Ans-1: a) Confounding variables are those variables whose presence might influence the experimentation, so seeds are not confounding.

b)They are not independent variables as they depend on the effect of light for their growth.

c) The 3 seeds are control variables. Because they are determined by the examiner and are actively added for the statistical research.

d) Here, growth of seed will be dependent variable.

2) a) If birth rates are variable as compared to death rates then it is not compulsory that population will grow. Hence, false.

b)If equal to death rate then also population growth will not increase.

C) lower than death rate: impossible to have growth in population because infant mortality is high.

d) Correct option. When birth rate will be higher than death rate then only population size can increase with high infant mortality.

3)a) it is the 3rd step in experimentation.

b) generate a hypothesis is the first step as first of all the topic of interest is to find out. And then a hypothesis should be made.

c) It is the 2nd step because after generating hypothesis we have to design the experimental.

d) last step is apply the units of the SI system.