Evolution of digestive organs
Answers are for parents and teachers.
1
A child has 20 milk teeth, an adult has 32. What is the difference?
12
2
Write the four parts of a ruminant stomach.
Rumen, reticulum, omasum and abomasum.
3
Write the evolution of digestion from intracellular to a gut tube in two sentences.
First digestion was in vacuoles, then in a cavity. Later a gut with mouth and anus and glands arose.
4
Why is a herbivore’s gut longer than a carnivore’s?
Plant food (cellulose) is hard to digest and needs long processing.
5
A dog’s dental formula for one half of each jaw is: upper 3 incisors, 1 canine, 4 premolars, 2 molars; lower 3 incisors, 1 canine, 4 premolars, 3 molars. How many teeth does a dog have in total?
42