With a neat labelled diagram describe the parts of a typical angiospermic ovule.

What are the phases of menstrual cycle? Indicate the changes in the ovary and uterus.

In angiosperms the pollen germinates to produce pollen tube that carries two gametes. What is the purpose of carrying two gametes when single gamete can fertilize the egg?

Why menstrual cycle does not take place before puberty and during pregnancy?

Read the following passage and answer the questions that follow Rahini and her parents were watching a television programme. An advertisement flashed on the screen which was promoting use of sanitary napkins. Rahini’s parents suddenly changed the channel, but she objected to her parents and explained the need and importance of such advertisement.
a) What is first menstruation called? When does it occur?
b) List out the napkin hygiene measures taken during menstruation?
c) Do you think that Rahini’s objection towards her parents was correct? If so, Why?