1In which of these animals does internal fertilization take place: lizard, frog, seahorse, salamander?
2Write the differences between a sex cell and a zygote.
3Write the differences between internal fertilization and external fertilization.
4Give the reason: sexual reproduction needs both a male and a female.
5Give the reason: external fertilization takes place in water or on the ground.
6Draw diagrams showing the different parts of a sperm and of an ovum.
7A dog gives birth to four puppies. What is this biological process called? Explain the role of the sex cells in sexual reproduction.
8Make a graphical chart that makes sexual reproduction in animals clear.
9What is gametogenesis? In which part of a plant's flower and in which part of an animal's reproductive organ does it take place?
10Name the method of fertilization in each of these animals: human being, pigeon, turtle, butterfly, fish, bat, frog, cow, cricket, whale.
11What would happen to living things if sexual reproduction stopped in animals and plants? Explain with examples.
12Give arguments for the statement that internal fertilization is safer than external fertilization.
13Where does a sperm get the energy to swim, and why does an ovum not need that energy?
14A frog releases hundreds of eggs at one time, but a cow gives birth to a single calf. Why is there such a difference?
15Why would fertilization be impossible if gametogenesis did not take place? Write your answer showing the order of events.