Quiz: Sexual Reproduction in Living Organisms — 9 perguntas

1. What is the primary purpose of sexual reproduction in living organisms?

A. To increase the number of offspring regardless of genetic variation

B. To ensure species continuity through gamete union and fertilization

C. To develop asexual offspring without the need for gametes

D. To produce genetically identical offspring

Answer: (B)

Explicação

The main purpose of sexual reproduction is to ensure species continuity by involving the union of gametes (sperm and ovule) and fertilization, which leads to the formation of a zygote and genetic diversity.

2. What is the primary purpose of reproduction in living organisms?

A. To generate energy for cell functions

B. To ensure species continuity through gamete union and fertilization

C. To grow larger and develop new features

D. To maintain genetic stability in a single individual

Answer: (B)

Explicação

Reproduction's main purpose is species continuity, achieved through the union of gametes and fertilization, forming new individuals.

3. Which of the following correctly describes a reproductive mode where the embryo develops outside the mother's body?

A. Internal fertilization

B. Viviparous

C. Pollination

D. Oviparous

Answer: (D)

Explicação

Oviparous animals lay eggs outside the body, with embryonic development occurring externally. Viviparous animals develop inside the mother.

4. Which of the following structures is found in plants and contains ovules?

A. Stamen

B. Pollen

C. Ovary

D. Pistil

Answer: (C)

Explicação

The ovary contains ovules in plants; the pistil includes the ovary but refers to the entire female reproductive part.

5. In flowering plants, what is the process called where pollen is transferred to the ovule, leading to seed formation?

A. Photosynthesis

B. Germination

C. Fertilization

D. Pollination

Answer: (D)

Explicação

Pollination is the transfer of pollen to the ovule, which is a key step in plant reproduction that leads to fertilization and seed formation.

6. What is the role of the pollen tube in plant reproduction?

A. It transports nutrients to the developing seed

B. It guides sperm to the ovule for fertilization

C. It produces pollen grains

D. It protects the ovule from environmental damage

Answer: (B)

Explicação

The pollen tube guides sperm cells from pollen to the ovule, enabling internal fertilization.

7. According to the revision sheet, which mode of fertilization involves releasing many gametes into water?

A. Internal fertilization

B. External fertilization

C. Oviparous fertilization

D. Viviparous fertilization

Answer: (B)

Explicação

External fertilization involves releasing numerous gametes into the environment, typically water, increasing the chances of fertilization.

8. Which animals are examples of viviparous species as mentioned in the revision sheet?

A. Birds and amphibians

B. Reptiles and fish

C. Mammals and some sharks

D. Insects and mollusks

Answer: (C)

Explicação

Viviparous animals develop embryos inside the mother and give birth to live young, such as mammals and some sharks.

9. What is the primary difference between oviparous and viviparous reproductive modes?

A. Oviparous animals develop their young inside the mother, viviparous animals lay eggs outside.

B. Oviparous animals lay eggs outside, viviparous animals develop embryos inside the mother.

C. Both modes involve development inside the mother but differ in fertilization methods.

D. Oviparous animals are aquatic, while viviparous animals are terrestrial.

Answer: (B)

Explicação

Oviparous animals lay eggs outside their bodies, while viviparous animals develop embryos internally, resulting in live birth.