Step 1: Understanding double fertilization.
In angiosperms (flowering plants), double fertilization involves the fusion of one male gamete with the egg cell to form the zygote and the fusion of another male gamete with the central cell to form the endosperm. Only one female gamete (the egg cell) is involved in this process.
Step 2: Analyzing the options.
(A) 6: Incorrect — Only one female gamete is needed for double fertilization in angiosperms.
(B) 2: Incorrect — Double fertilization involves only one egg cell being fertilized by the male gametes.
(C) 1: Correct — One female gamete (the egg cell) is involved in double fertilization.
(D) 4: Incorrect — Only one female gamete is involved in the process.
Step 3: Conclusion.
The correct answer is (C) 1, as only one female gamete is required for double fertilization in angiosperms.