Which of the following are the main methods of reproduction?

Select the correct option for the zygote.
$I -$ It is found only in organisms undergoing sexual reproduction.
$II -$ It is always diploid $(2n)$.
$III -$ It is also known as a fertilized egg.
$IV -$ It is always formed as a result of fertilization or syngamy.
$V -$ It is the link between two generations.

Is there any relationship between the size of an organism and its lifespan? Give two examples to support your answer.

Choose the odd one with respect to sexuality.

In a practical test, a student has to identify the organisms in which syngamy does not occur. In those organisms, the female gamete undergoes development to form new organisms without fertilization. This phenomenon is called "$X$". Identify the organisms and the phenomenon "$X$".

Differentiate between a zoospore and a zygote.