Important Questions: Reproduction in Animals - Class 8 MCQ

Reproduction without the fusion of gametes is known as asexual reproduction. The offspring are genetically identical.

Butterfly undergoes sexual reproduction.

An egg cell can live in the body for only one day.

W is placenta, X is foetal, Y is amniotic fluid and Z is foetal membrane.

Placenta prevents the mixing of the blood of the foetus with that of the mother.

The correct sequence in the formation of a baby is as follows. Zygote →  Embryo → Foetus → Baby

Options I and III are true of comparison of sexual and asexual reproduction.

Unicellular organisms like amoeba and paramoecium undergoes binary fission.

• Fertilization occurs when a sperm meets an egg, which typically happens in the fallopian tube.
• The fallopian tubes connect the ovaries to the uterus and provide a pathway for the egg to travel after ovulation.
• While the ovaries produce eggs and the uterus is where a fertilized egg implants, the actual meeting of sperm and egg takes place in the fallopian tube.

The animals that produce new young ones are called viviparous animals.

Explanation:

Viviparous animals give birth to live young, unlike oviparous animals, which lay eggs. In viviparous animals, the embryo develops inside the mother's body, receiving nourishment directly until birth. Examples include most mammals, like humans, dogs, and cats.

The correct answer is:

Frog

Explanation: External fertilization occurs when the fusion of sperm and egg happens outside the body of the organism, usually in a water environment. Frogs show external fertilization, where both male and female release their gametes into water, and fertilization takes place outside their bodies. In contrast, humans, cows, and hens undergo internal fertilization, where fertilization happens inside the female body.

P is ovulation, Q is implantation and R is fertilization.

• The umbilical cord connects the fetus to the placenta, facilitating nutrient and waste exchange.
• It transports urea, a waste product, from the fetus to the mother for elimination.
• Antibodies are transferred to provide the fetus with immunity against infections.
• Carbon dioxide, a waste gas produced by the fetus, is carried back to the mother for exhalation.

Hydra reproduce by asexual mode. Budding is the process by which hydra reproduce through asexual mode. An outgrowth grows from the parent body due to the repeated cell division at a specific site. The cell which divide rapidly are known as regenerative cell. The outgrowth from the parent body is known as bud. This bud separates from the parent and develops into a genetically identical new organism.