Free Reproduction MCQs with Answers
1,220 Reproduction MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
Last updated
Read the Reproduction notesFree MDCAT chapter notes with key terms1,220 questions · page 53 of 61
- A. Human chorionic gonadotropin
- B. Prolactin
- C. Estrogen
- D. Progesterone
Explanation: Prolactin is not primarily produced by the placenta. Prolactin is mainly produced by the anterior pituitary gland in the brain and plays a…
Correct answer: Prolactin- A. Organizer phenomena
- B. Axis formation
- C. Anamorphosis
- D. Pattern formation
Explanation: The term "organizer phenomena" refers to specific signaling centers within developing embryos that play a critical role in the…
Correct answer: Organizer phenomena- A. Size of embryo increases
- B. Size of cells decreases
- C. Size of cells increases
- D. Size of embryo decreases
Explanation: During cleavage, the zygote undergoes rapid cell divisions without a significant increase in overall size.
Correct answer: Size of cells decreases- A. Mesolecithal
- B. Aalecithal
- C. Microlecithal
- D. Macrolecithal
Explanation: In human beings, the eggs (oocytes) are alecithal, which means they have a relatively small amount of yolk (or cytoplasmic nutrient…
Correct answer: Aalecithal- A. The amount and distribution of yolk
- B. The number of egg membranes
- C. The shape and size of the sperm
- D. The size and location of the nucleus
Explanation: The amount of yolk and how it is distributed determines the type of cleavage.
Correct answer: The amount and distribution of yolk- A. It starts while the egg is in the fallopian tube
- B. It starts when the egg reaches the uterus
- C. It is meroblastic
- D. It is identical to the normal mitosis
Explanation: Cleavage is a series of rapid mitotic divisions of the zygote which convert the single-celled zygote into a multicellular structure called…
Correct answer: It starts while the egg is in the fallopian tube- A. Trophoblast
- B. Inner cell mass
- C. Formative cells
- D. Follicle cell
Explanation: The trophoblast is the outer layer of cells that forms after the blastocyst stage during embryonic development.
Correct answer: Trophoblast- A. Obliteration of blastocoel
- B. Obliteration of archenteron
- C. Closure of blastopore
- D. Closure of neural tube
Explanation: During gastrulation, the blastula undergoes significant changes to form the three germ layers: ectoderm, mesoderm, and endoderm.
Correct answer: Obliteration of blastocoel- A. All over the egg
- B. On one side
- C. Both the sides
- D. Centre
Explanation: In telolecithal eggs, the yolk is found predominantly on one side of the egg, forming a distinct yolk mass.
Correct answer: On one side- A. Horizontal
- B. Partial/parietal
- C. Total
- D. Spiral
Explanation: Meroblastic cleavage is partial or parietal cleavage. In eggs with a large amount of yolk, like those of birds and reptiles, only a…
Correct answer: Partial/parietal1051. Eye lens is formed from:
- A. Ectoderm
- B. Mesoderm
- C. Endoderm
- D. Ectoderm and Mesoderm
Explanation: The eye lens is primarily formed from the ectoderm. During early embryonic development, a portion of the ectoderm on the surface of the…
Correct answer: Ectoderm- A. Nucleocytoplasmic ratio remains unchanged
- B. Size does not increase
- C. There is less consumption of oxygen
- D. None of these
Explanation: Let's evaluate each statement about cells during cleavage to determine what is false: a.
Correct answer: Nucleocytoplasmic ratio remains unchanged1053. Human eggs are:
- A. Alecithal
- B. Microlecithal
- C. Mesolecithal
- D. Macrolecithal
Explanation: a. Alecithal: Alecithal eggs have a very small amount of yolk, and most of the cytoplasm is evenly distributed throughout the egg.
Correct answer: Alecithal- A. Secondary oocyte stage
- B. Primary oocyte stage
- C. Oogonial stage
- D. All of these
Explanation: The correct answer is: a. Secondary oocyte stage Now, let's explain all the options along with the reasons: a.
Correct answer: Secondary oocyte stage- A. Condoms
- B. IUDs
- C. Lippes loop
- D. Tubectomy
Explanation: a. Condoms: Condoms are a popular method of contraception. They are physical barriers made of latex, polyurethane, or other materials.
Correct answer: IUDs- A. Embryo only, upto 8 cell stage
- B. Either zygote or early embryo upto 8 cell stage
- C. Embryo of 32 cell stage
- D. Zygote only
Explanation: In in vitro fertilization, the fertilized eggs are grown for about 2 days usually upto 2 to 8 cell stage.
Correct answer: Embryo only, upto 8 cell stage- A. dN/dt = rN
- B. dt/dN = rN
- C. dN/rN = d
- D. rN/dN = d
Explanation: Nearly all populations will tend to grow exponentially as long as there are resources available.
Correct answer: dN/dt = rN- A. Biotic potential
- B. Fertility rate
- C. Carrying capacity
- D. Birth rate
Explanation: The biotic potential is defined as the physiological capacity of organisms to produce their offspring under natural conditions.
Correct answer: Biotic potential- A. Four viable sperms
- B. Two viable sperms
- C. One viable sperm
- D. Three viable sperms
Explanation: Spermatogonia differentiates into primary spermatophytes which undergo meiotic division to form 2 secondary spermatocytes which gives 4…
Correct answer: Two viable sperms- A. Oogonia
- B. Primary oocytes
- C. Secondary oocytes
- D. Ova
Explanation: Germ cells in the ovary produce many oogonia which divide mitotically to form primary oocytes.
Correct answer: Oogonia