In Ophioglossum (a fern) chromosome number in gamete ..... and in potato chromosome number in gamete is ....

Some organisms like $...A.., ...B..., ...C...$ and $...D...$ the female gamete undergoes development to form new organisms without fertilisation

$A - B - C - D$

Which of the following statements are correct regarding female reproductive cycle?

$A$. In non-primate mammals cyclical changes during reproduction are called oestrus cycle.

$B$. First menstrual cycle begins at puberty and is called menopause.

$C$. Lack of menstruation may be indicative of pregnancy.

$D$. Cyclic menstruation extends between menarche and menopause.

Choose the most appropriate answer from the options given below.

The development of gametophyte from the vegetative parts of the sporophyte without the intervention of spores is called

Which of the following plants is monoecious ?

Select the incorrect pair :