Excretory and reproductive organs, Lab 5
Answers are for parents and teachers.
1
A frog lays 2000 eggs and 1 % survive. How many survive?
20
2
Write one aromorphosis each for a fish, a bird and a mammal.
Fish – the gill; bird – four-chambered heart or feather; mammal – uterus or mammary gland.
3
One person excretes about 1.5 L of urine a day. How many litres do 4 people excrete in 3 days?
18
4
Why does a bird egg have much yolk?
The embryo develops without outside food, so the yolk supplies it.
5
Whale flippers are an idioadaptation of which organ?
The forelimb of a land animal adapted to life in water.