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Answers
Answer:
(a)
(i)In contrast, viviparous animals are born as live young individuals. Therefore, they do not lay eggs. Birds, reptiles, amphibians, most fish, insects, mollusks, arachnids, and monotremes are oviparous animals. Most mammals are viviparous animals.
(ii)The release of the ripe egg (ovum) from the ovary. The egg is released when the cavity surrounding it (the follicle) breaks open in response to a hormonal signal.
(b)
(i) Scrotum
(ii)epididymis
(c)
(i)Metamorphosis is a biological process which involves sudden and abrupt changes in the body structure of the animal by cell growth and differentiation. It is generally observed in amphibians and insects. Examples: frogs and butterflies.
(ii)The Role of Semen
The secretions in semen are important for the survival and motility of sperm. They provide a medium through which sperm can swim. They also include sperm-sustaining substances, such as high concentrations of the sugar fructose, which is the main source of energy for sperm.
(d)
(i)Fragmentation, also known as splitting, is a form of asexual reproduction in which an organism splits into fragments. ... Fragmentation as a method of reproduction is seen in organisms such as filamentous cyanobacteria, molds, lichens, sponges, acoel flatworms, some annelid worms and sea stars.
(ii)In vitro fertilization
Explanation:
Answer:
(a) vivjparous: viviparous animals under go internal fertilization and the embryo develops inside the mother until a young one is born.
oviparous animals: the oviparous animals produce eggs but the eggs develop inside the mother and a live organism is born.
(b) (i)each cremaster muscle surronds one of the testicles and it's spermatic cord. the muscle helps to move the testicle toward and away from the body to maintain the ideal temperature
for sperm production. this is why the scrotum hangs lower in warm conditions and closer to the body in cold weather.
(ii)epididymis
(c) (i) examples of metamorphosis include the tadpoles, an aquatic larval stage that transforms
into the land-dwelling frog (class amphibia).
(ii) the role of semen
the secretions in semen are important for the survival and motility of sperm. they provide a medium through which sperm can swim. they also include sperm - sustaining substances, such as high concentrations of the sugar fructose, which is the main source of energy for sperm.
(d)(i) the definition of fragmentation is being broken down into sections. an example for fragmentation is cutting a worm into pieces.
(ii) IN VITRO FERTILIZATION.
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