chapter 19-21

Grade/class/name 

Which name is given to the observable features of an organism

What is not a feature of natural selection

What is a mutation

The table shows the birth rates and death rates in four countries.

Which country will double its population most quickly? 

By which process does water enter the atmosphere?

Which characteristic shows discontinuous variation in humans

A man who was blood group A and a woman who was blood group B had four children, each with  a different blood group A, B, AB and O.

Which type of variation does this demonstrate?

Cacti have fewer stomata than other plants.

How does this help them to survive in desert conditions?

A food chain shows how organisms depend on each other for their sources of energy, but all  energy comes ultimately from one source.

What is this energy source?

The diagram shows a food web.

What type of organism is X?

What is the correct sequence for the stages in a sigmoid  population growth curve?

In an ecosystem, what happens to most of the chemical energy in the decomposers?

In a pyramid of numbers, what does the top of the pyramid represent

Rabbits eat grass and foxes eat rabbits.

What would cause the highest increase in the number of rabbits?

The diagram shows a food chain.

rice plant → caterpillar → song bird → hawk

How many decomposers are shown in this food chain?

which enzyme is used to cut the DNA into disirable pieces?    ______  enzyme 

which enzyme is to join two fragements of DNA together?  

there is a cricular DNA that can be frequently used in gene engineering becasue of its transferring ability between different bacteria. it is called _____

the enzyme peptidase is used to breakdown the cell wall of plant cell and make clear juice.

which products of fermentation (anaerobic respiration in yeast) are important in the production of bread and beer