Question 1

Which type of asexual reproduction is depicted in the first image, where an organism splits into two individuals of approximately equal size?

Accepted Answer

Fission

Question 2

What is the primary evolutionary advantage of sexual reproduction over asexual reproduction?

Accepted Answer

It increases genetic diversity among offspring.

Question 3

In the process of fertilization shown in the second image, what is the function of the cortical granule reaction?

Accepted Answer

To prevent polyspermy by modifying the egg's outer layer

Question 4

Which embryonic germ layer gives rise to the nervous system and skin?

Accepted Answer

Ectoderm

Question 5

During gastrulation in sea urchins (see images 4-6), which structure forms as a result of the invagination of endodermal cells?

Accepted Answer

Archenteron

Question 6

In the development of protostomes and deuterostomes (see image 3), what is the fate of the blastopore in deuterostomes?

Accepted Answer

It becomes the anus.

Question 7

Which of the following statements about internal fertilization is correct?

Accepted Answer

It typically results in fewer, higher-quality gametes.

Question 8

A lizard species is able to produce offspring from unfertilized eggs that are genetically identical to the mother. What is this process called?

Accepted Answer

Parthenogenesis

Question 9

Which of the following best describes the process of neurulation as shown in the last two images?

Accepted Answer

Development of the neural tube from the ectoderm

Question 10

In vertebrate development, what do somites, which arise from the mesoderm, eventually form?

Accepted Answer

The vertebral column, muscles, and ribs

Question 11

Which of the following equations best represents the ploidy change during fertilization?

Accepted Answer

$$n + n \rightarrow 2n$$

Question 12

Which process is responsible for the production of gametes in animals?

Accepted Answer

Meiosis

Question 13

A researcher observes an animal that can produce both sperm and eggs and sometimes self-fertilizes. What reproductive strategy is this?

Accepted Answer

Hermaphroditism

Question 14

Which of the following is a correct sequence of events during sea urchin gastrulation?

Accepted Answer

Invagination of endodermal cells, formation of archenteron, differentiation of germ layers

Question 15

Which of the following is a disadvantage of asexual reproduction in changing environments?

Accepted Answer

It limits adaptability due to lack of genetic diversity.

Question 16

During oogenesis in humans, which of the following is true?

Accepted Answer

It is usually prolonged and not continuous.

Question 17

Which of the following best describes the difference between external and internal fertilization?

Accepted Answer

External fertilization involves the release of many low-quality gametes into the environment.

Question 18

Which germ layer is responsible for forming the lining of the gut?

Accepted Answer

Endoderm

Question 19

In the context of fertilization, what is the 'fast block' to polyspermy?

Accepted Answer

Depolarization of the egg membrane

Question 20

Which of the following best explains why sexual reproduction is considered an evolutionary enigma?

Accepted Answer

Despite producing fewer offspring, sexual reproduction persists due to increased genetic variation.

Reproduction and Development in Animals

Study Guide - Practice Questions