Match the following:

Step 1: Correct Matching.
A (Syngamy): This term refers to the fusion of two gametes. Since it generally implies the fusion of a male and a female gamete, it matches with IV (Fusion of two gametes).
B (Fusion of similar gametes): This is the definition of Isogamy, where gametes are similar in form and function, matching with I (Isogamy).
C (Anisogamy): This term refers to the fusion of dissimilar gametes, typically differing in size and sometimes in function, which aligns with II (Fusion of dissimilar gametes).
D (Fusion of two mature organisms): This is a less common form, matching with III (Hologamy), where entire organisms may fuse or merge.
Select the option having correct matching of the organism given in Column I with the mode of reproduction in Column II: Column I {0.2cm} 
What changes are observed in the uterus:
(i) Subsequent to the implantation of the zygote and
(ii) If an egg does not get fertilized?
Name the part performing the following functions in the human female reproductive system:
(i) Production of eggs
(ii) Site of fertilization
(iii) Site of implantation
(iv) Entry of the sperms
Why are testes in human males located outside the abdominal cavity in scrotum?
