Fertilization and Implantation MCQs : This section focuses on the "Fertilization and Implantation" in Biology Class 12. These Multiple Choice Questions (MCQs) should be practiced to improve the Biology Class 12 skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
__________ are the most critical events in the reproduction process.
C. Fertilization and Implantation
D. None of the above
Explanation: Fertilization and implantation are the most critical events in the reproduction process. In this process, both egg and sperm are fused together to form a zygote. Later it gets implanted into the uterus and the development of an organism.
Fertilization is the natural life process, which is carried out by the fusion of?
A. male and male gametes
B. female and female gametes
C. Both A and B
D. male and female gametes
Explanation: Fertilization is the natural life process, which is carried out by the fusion of both male and female gametes,
How long does it take for the egg to get fertilized?
A. 0-12 hours
B. 12-24 hours
C. 0-48 hours
D. 24-36 hours
Explanation: The egg is alive for about 12-24 hours after its release from the ovary. If it is not fertilized by this time, it disintegrates and is shed off by the uterine lining.
The fertilization process in humans takes place in several stages involving both the chemical and physical events.
C. Can be true or false
D. Can not say
Explanation: True, The fertilization process in humans takes place in several stages involving both the chemical and physical events.
How long does sperm live?
A. 12 hours
B. 24 hours
C. 48 hours
D. 72 hours
Explanation: The sperm stays alive for about 72 hours. The sperms swim upwards to the fallopian tube to fertilize the egg. The faster the sperm swims, the earlier it reaches the egg.
The population of vagina with semen during coitus is called as _______
Explanation: Coitus or copulation is the process that leads to the release of semen from the penis into the vagina. The sperms populate the vagina along with other contents of semen. This process is called insemination.
What part of the oviduct does the sperm encounter the egg?
Explanation: The egg is released and awaits in ampulla for the sperm. The sperms cross the reproductive tract barriers before reaching the ampulla to fertilize the egg.
What are the mitotic divisions that a zygote undergoes called?
D. Fetal development
Explanation: As the zygote is formed, it passes through isthmus towards the uterus. Through the passage, it undergoes rapid mitotic divisions. This is called cleavage.
The daughter cells formed as a result of cleavage of a zygote are called ________
Explanation: Zygote undergoes cleavage producing an exponential increase in cell mass. These new daughter cells formed are called blastomeres. They form a blastula with a blastocoel cavity enclosed in between.
Implantation is the stage where the embryo adheres to the wall of the uterus.
C. Can be yes or no
D. Can not say
Explanation: Yes, Implantation is the stage where the embryo adheres to the wall of the uterus.