Question 1. Why is reproduction important?
Answer . It is because of reproduction that life continues from generation to generation.
Question 2. What is menstruation?
Answer . If the ovum is not fertilized by a sperm, it is expelled from the uterus along with some uterine muscles and blood. This is known as menstruation.
Question 3. How does Hydra reproduce:
Answer . Hydra reproduces by budding. In Hydra, a bud appears on the body wall which grows into a full Hydra in a day or two and separates from the parent.
Question 4. How does placenta help the foetus?
Answer . The placenta is responsible for providing oxygen and nutrients and removing waste substances.
Question 5. What is metamorphosis?
Answer . The series of change in an organism during its life cycle that transform it from the larva to an adult.
|External fertilization||Internal fertilization|
|Fusion of the gametes takes place outside the body of the organisms.||Fusion of the gametes takes place inside the body of the organisms.|
|Example: In most aquatic animals, such as bony fish||Example: In organisms like reptiles, birds and mammals|