Draw a diagram of the male reproductive system and explain its various parts.

Suggest three contraceptive methods to control the size of human population which is essential for the health and prosperity of a country. State the basic principle involved in each.

Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.

1. Write the names of those parts of a flower which serve the same function as the following do in the animals:

1. Testis.
2. Sperm.
3. Ovary.
4. Egg.

2. State the function of flowers in the flowering plants.

In the context of reproduction of species state the main difference between fission and fragmentation. Also give one example of each.

From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of organism and answer the following questions.

1. Do larger organisms have more number of chromosomes/ cells?
2. Can organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes?
3. More the number of chromosomes/ cells greater is the DNA content. Justify.

What happens when

1. Planaria gets cut into two pieces?
2. A mature spirogyra filament attains considerable length?
3. On maturation sporangia burst?

What is the probability of a girl or a boy being born in a family? Justify your answer.

What is implantation? Where does it take place? Mention the structure involved and its function.

Explain budding in Hydra with the help of diagrams only.