Animal Sexual Reproduction Practice Questions
19 free Animal Sexual Reproduction practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
What is sexual reproduction in animals mainly characterized by?
- A Production of offspring from only one parent
- B Division of one body into two parts
- C Formation of spores
- D Fusion of male and female gametes
Correct answer: Fusion of male and female gametes
Sexual reproduction involves the fusion of male and female gametes to form a zygote. This process combines genetic material from two parents and produces variation in offspring.
The male gamete in animals is called:
- A Ovum
- B Zygote
- C Embryo
- D Sperm
Correct answer: Sperm
The sperm is the male reproductive cell or gamete. It usually moves toward the ovum to take part in fertilization.
The female gamete in animals is called:
- A Sperm
- B Testis
- C Zygote
- D Ovum
Correct answer: Ovum
The ovum, or egg cell, is the female gamete. It fuses with a sperm during fertilization to form a zygote.
What is fertilization?
- A The growth of an embryo into an adult
- B The release of eggs from the ovary
- C The formation of blood cells
- D The fusion of sperm and ovum
Correct answer: The fusion of sperm and ovum
Fertilization is the fusion of the male gamete and female gamete. It results in the formation of a single-celled zygote.
The cell formed immediately after fertilization is called a:
- A Sperm
- B Ovum
- C Zygote
- D Tissue
Correct answer: Zygote
A zygote is formed when the sperm and ovum fuse. It later divides repeatedly and develops into an embryo.
Which of the following animals commonly shows external fertilization?
- A Human
- B Dog
- C Frog
- D Cow
Correct answer: Frog
Frogs usually release eggs and sperms into water, where fertilization occurs outside the female body. This is known as external fertilization.
In internal fertilization, the fusion of gametes occurs:
- A Only in water outside the body
- B Inside plant flowers
- C Inside the female body
- D In the soil
Correct answer: Inside the female body
Internal fertilization occurs when sperm and ovum fuse inside the female body. It is common in mammals, birds, and reptiles.
Which of the following animals shows internal fertilization?
- A Frog
- B Fish in most cases
- C Human
- D Sea urchin
Correct answer: Human
Humans show internal fertilization, where the sperm fuses with the ovum inside the female reproductive tract. This provides a protected environment for fertilization.
Animals that lay eggs are called:
- A Viviparous animals
- B Herbivorous animals
- C Nocturnal animals
- D Oviparous animals
Correct answer: Oviparous animals
Oviparous animals reproduce by laying eggs. Birds, frogs, and many reptiles are examples of oviparous animals.
Animals that give birth to young ones are called:
- A Oviparous animals
- B Amphibious animals
- C Cold-blooded animals
- D Viviparous animals
Correct answer: Viviparous animals
Viviparous animals give birth to live young ones instead of laying eggs. Most mammals, including humans, are viviparous.
Which male reproductive organ produces sperms in humans?
- A Ovary
- B Uterus
- C Oviduct
- D Testis
Correct answer: Testis
The testes are the male reproductive organs that produce sperms. They also produce the male sex hormone testosterone.
Which female reproductive organ produces ova in humans?
- A Testis
- B Penis
- C Ovary
- D Scrotum
Correct answer: Ovary
The ovaries produce ova or egg cells in females. They also release female reproductive hormones.
In humans, fertilization usually occurs in the:
- A Uterus
- B Ovary
- C Birth canal
- D Oviduct
Correct answer: Oviduct
In humans, fertilization usually occurs in the oviduct, also called the fallopian tube. The fertilized egg then moves toward the uterus for development.
Where does the embryo develop in human females?
- A Ovary
- B Testis
- C Urethra
- D Uterus
Correct answer: Uterus
The embryo implants and develops in the uterus. The uterus provides protection and nourishment during pregnancy.
The process by which a zygote develops into an embryo involves:
- A Meiotic division
- B Random cellular migration
- C Repeated cell division
- D Programmed cell death process
Correct answer: Repeated cell division
After fertilization, the zygote divides repeatedly to form many cells. These cells later organize into tissues and organs of the embryo.
Which structure connects the developing fetus to the mother and helps in exchange of materials?
- A Umbilical cord
- B Amniotic sac
- C Placenta
- D Yolk sac
Correct answer: Placenta
The placenta allows exchange of oxygen, nutrients, and wastes between the mother and the developing fetus. It plays an important role during pregnancy.
Which of the following is an advantage of sexual reproduction?
- A It produces offspring with no genetic variation
- B It always needs only one parent
- C It occurs only in bacteria
- D It creates genetic variation among offspring
Correct answer: It creates genetic variation among offspring
Sexual reproduction combines genetic material from two parents. This produces variation, which can help species adapt to changing environments.
Which stage comes immediately after the zygote begins dividing repeatedly?
- A Adult
- B Gamete
- C Embryo
- D Eggshell
Correct answer: Embryo
The zygote divides repeatedly and develops into an embryo. The embryo then continues to grow and form organs.
Why do many animals that show external fertilization release a large number of eggs?
- A Because all released eggs survive and hatch
- B Because eggs cannot develop without water present
- C Because sperms alone cannot ensure fertilization
- D Because survival chances outside the body are low
Correct answer: Because survival chances outside the body are low
In external fertilization, eggs and sperms are exposed to the environment, so many may not survive or meet. Releasing many eggs increases the chance that some offspring will develop successfully.