Biology

Human Reproductive System

751 Questions

The human reproductive system covers the anatomy of reproductive organs, gamete production, fertilization processes, and reproductive technologies. This is a highly scoring area in biology sections of competitive exams. Use these questions to practice key concepts.

Fertilization processGamete productionReproductive organ functionsAssisted reproductive technology

Human Reproductive System Questions

Multiple choice

Grey crescent is the area

  1. at the point of entry of sperm into ovum.

  2. just opposite to the site of entry of sperm into ovum.

  3. at the animal pole.

  4. at the vegetal pole.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  Grey crescent is the area just opposite to the site of entry of sperm into ovum.Its establishment determines the location of the dorsal and ventral (up-down) axis, as well as of the anterior and posterior (front-back) axis and the dextro-sinistral (left-right) axis of the embryo.

Multiple choice

If mammalian ovum fails to get fertilized, which one of the following is unlikely?

  1. Estrogen secretion further decreases.

  2. Progesterone secretion rapidly declines.

  3. Corpus luteum will disintegrate.

  4. Primary follicle starts developing.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 From birth, the ovaries of the human female contain a number of immature, primordial follicles. These follicles each contain a similarly immature primary oocyte. After puberty and commencing with the first menstruation, a clutch of follicles begins folliculogenesis, entering a growth pattern that will end in death or in ovulation (the process where the oocyte leaves the follicle).

Multiple choice

Biochemical basis of reproduction is

  1. RBC

  2. WBC

  3. neuron

  4. DNA
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

DNA serves as the biochemical basis of reproduction because it carries genetic information from parent to offspring. During reproduction, DNA replicates and is transmitted to daughter cells or offspring, ensuring continuity of genetic information. Unlike blood cells (RBCs, WBCs) or neurons, DNA contains the hereditary material essential for reproduction.

Multiple choice

In lateral conjugation,

  1. male and female gametes are present in different filaments

  2. male and female gamete are present in the same cell

  3. male and female gametes are present in the same filament

  4. male and female gametes are coupled with each other
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In lateral conjugation, male and female gametes are present in the same filament. Male and female gametes are present in two adjacent cells, which conjugates to form a diploid zygospore.

Multiple choice

In double fertilization, the male gamete fuses with the __________.

  1. egg cell

  2. egg cell and another male gamete with two polar nuclei

  3. antipodals

  4. two polar nuclei or their fusion product

  5. another male gamete with two polar nuclei
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In double fertilization, the male gamete fuses with the egg cell and another male gamete with two polar nuclei.

Multiple choice

Which of the following is the biochemical basis of reproduction?

  1. RBC

  2. WBC

  3. Neuron

  4. DNA
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

DNA (deoxyribonucleic acid) is the biochemical basis of reproduction because it is the molecule that carries genetic information from one generation to the next. During reproduction, DNA is replicated and passed to offspring, ensuring continuity of genetic information. The DNA molecule contains genes that code for all the traits and characteristics of an organism. In cellular reproduction, DNA replicates through mitosis (asexual reproduction) or meiosis (sexual reproduction), while in molecular biology, DNA replication is the fundamental process that allows genetic material to be copied. RBCs lack DNA entirely, WBCs are immune cells (not directly involved in genetic transmission), and neurons transmit nerve impulses (not genetic information).

Multiple choice

Double fertilisation means the fusion of

  1. one male gamete with the egg and the other with the antipodal cell

  2. one male gamete with the egg and the other with the secondary nucleus

  3. one male gamete with the egg and other with the synergids

  4. two male gametes with an egg

Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice

Which organ system helps us to produce babies?

  1. Muscular

  2. Circulatory

  3. Respiratory

  4. Reproductive

  5. Excretory
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reproductive system helps in producing young ones with the help of reproductive organs present in human body.

Multiple choice

How is the sex of a child determined?

  1. By ovum

  2. By sperm

  3. By environment

  4. By the time of mating

  5. By the number of matings
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sperms have one X and one Y chromosome. The sperm carrying X chromosome when fused with an ovum forms a female child. The sperm carrying Y chromosome when fused with an ovum forms a male child.