Question
Biology Question on Pre-Fertilisation: Structures And Events
Refer to the given diagrams showing different types of syngamy and select the option that gives correct example of each of these. 
A
a
B
b
C
c
D
d
Answer
d
Explanation
Solution
Syngamy is the complete and permanent fusion of male and female gametes to form the zygote. In Cladophora reproduction is isogamous. Isogamy, shown in figure (i) involves the fusion of gametes which do not differ morphologically but may be different physiologically. Such gametes are called isogametes. In humans, anisogamy is observed which involves fusion of gametes that differ in size or motility, as seen in figure (ii). The common type of anisogamy is oogamy, which involves fusion of large immotile female gamete and small motile male gamete.