Question 1

Which hormone is primarily responsible for triggering ovulation during the ovarian cycle?

Accepted Answer

Luteinizing hormone (LH)

Question 2

During which phase of the menstrual cycle does the endometrium thicken in preparation for possible implantation?

Accepted Answer

Proliferative phase

Question 3

What is the main function of the corpus luteum after ovulation?

Accepted Answer

To secrete estrogen and progesterone

Question 4

Which event marks the beginning of pregnancy (gestation) in humans?

Accepted Answer

Fertilization of the egg by sperm in the oviduct

Question 5

If two follicles mature and are released during a single ovarian cycle and both are fertilized, what is the likely outcome?

Accepted Answer

Fraternal twins

Question 6

Which hormone is secreted by the embryo to maintain the corpus luteum during the first trimester of pregnancy?

Accepted Answer

Human chorionic gonadotropin (hCG)

Question 7

Which of the following contraceptive methods works by preventing implantation of a fertilized egg?

Accepted Answer

Intrauterine device (IUD)

Question 8

Which extraembryonic membrane is primarily responsible for gas exchange in the human embryo?

Accepted Answer

Chorion

Question 9

What is the correct sequence of early embryonic development in animals?

Accepted Answer

Fertilization → Cleavage → Gastrulation → Organogenesis

Question 10

Which germ layer gives rise to the lining of the digestive tract?

Accepted Answer

Endoderm

Question 11

What is the main difference between holoblastic and meroblastic cleavage?

Accepted Answer

Holoblastic cleavage is complete division of the egg, while meroblastic is incomplete

Question 12

Which hormone is responsible for stimulating uterine contractions during labor?

Accepted Answer

Oxytocin

Question 13

A patient is prescribed RU486 (mifepristone). What is the primary mechanism by which this drug prevents pregnancy?

Accepted Answer

It prevents implantation of the embryo

Question 14

Which of the following is NOT a function of the placenta?

Accepted Answer

Formation of the fetal nervous system

Question 15

Which phase of the ovarian cycle is characterized by the highest levels of progesterone?

Accepted Answer

Luteal phase

Question 16

A woman’s menstrual cycle is disrupted due to a failure of the corpus luteum to form. Which hormone would be most directly affected?

Accepted Answer

Progesterone

Question 17

Which of the following best describes the role of the acrosomal reaction during fertilization?

Accepted Answer

It releases enzymes that help the sperm penetrate the egg

Question 18

Which of the following contraceptive methods is most effective at preventing both pregnancy and sexually transmitted diseases (STDs)?

Accepted Answer

Condom

Question 19

During which stage of labor is the placenta delivered?

Accepted Answer

Third stage

Question 20

Which of the following best explains why birth control pills can prevent ovulation?

Accepted Answer

They maintain high levels of estrogen and progesterone, inhibiting GnRH release

Animal Reproduction and Development: Study Guidance

Study Guide - Practice Questions