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For example, Mammals including human beings are viviparous animals and hen, lizards, all birds, etc., are oviparous animals. Earthworm, Leech. Here’s a Solved Question for You. Ascaris lumbricoides: Unsegmented body, mostly parasites in human beings and animals, causing diseases, asexual reproduction. Sexual Intercourse Definition. Examples of oviparous and viviparous organisms are snakes and dogs, respectively. 5. 5. Dwelling/Habitat : These animals live in the aquatic environment as well as on land. In animals which undergo external fertilization, development of the embryo takes place outside the female body. In angiosperms, zygote develops into the ovary and ovary transforms into fruit while ovules develop into seeds. This phylum consists of a small group of worm-like marine animals with organ-system level of organisation. This can be done artificially as well, which is widely employed in horticulture. They can be oviparous or viviparous and have four legs. 2. Their larval stage is spent in water and adulthood on land. Describe the process of fertilisation in human beings. Sexual intercourse, or copulation, is the deposition of sperm into a female via a male intromittent organ.In humans, the intromittent organ is the penis, and sperm are deposited into the vagina, where they make their way to towards the uterus to fertilize an egg. After the embryos develop, the eggs hatch. In oviparous fish, internal fertilisation requires the male to use some sort of intromittent organ to deliver sperm into the genital opening of the female. Reptiles live on land (terrestrial animal), but some of them like alligators, turtles and crocodile can live in water also. Eg. Hemichordata was earlier considered as a sub-phylum under phylum Chordata. Phylum – Hemichordata. such as: sheep, goats, pigs, cows, rabbits, rats, mice, fish, insects, parasites and even humans have previously been used in this modification process. Give two differences between a zygote and a foetus. Cold-blooded animals have fluctuating body temperature which follows the external temperature and fails to maintain thermal homeostasis. Reproduction in Animals Class 8 Science NCERT Textbook Questions. Examples include the oviparous sharks, such as the horn shark, and oviparous rays, such as skates. Answer the following questions in short: 1. Examples The animals which give birth to young ones are called viviparous animals and those which lay eggs are called oviparous animals. Viviparous animals, on the other hand, give birth to young ones. Question 1. Explain the importance of reproduction in organisms. 12. In general, the life cycles of plants and animals have three basic stages including a fertilized egg or seed, immature juvenile, and adult. Phylum Aschelminthes or Nematoda. Animals are classified into oviparous and viviparous based on whether the zygote develops outside or inside the body respectively. Explain the importance of reproduction in organisms. Phylum Annelida Eg. Answer: Reproduction is a vital phenomenon on this planet earth which is essential for existence and continuity of life and species on it, generation after generation. Warm-blooded animals maintains their thermal homeostasis and keep their body temperature consistent irrespective of the external temperature. Oviparous animals lay eggs which develop into young ones. Animals that show internal fertilization can develop through viviparous or oviparous processes. 4. In these cases, the male is equipped with a pair of modified pelvic fins known as claspers. This activity will help assess your knowledge of the different types and examples of non-flowering plants. Plants reproduce asexually through their vegetative parts such as leaves, roots, stem, and buds.This is known as vegetative propagation. Animals. Mammals and fish. Define asexual reproduction. 5) Vegetative Propagation. For example, onion bulbs, tubers of potato, runners/stolon, etc. 3. Describe two methods of asexual reproduction in animals. ... 10. Acoelomates, parasites inside the body of animals and human beings, mostly hermaphrodite (bisexual). 6. But now it is placed as a separate phylum under non-chordata. Vegetative propagation is much faster than the sexual reproduction in plants. Examples: Star fish, Sea urchin, Sea lily, Sea cucumber, Brittle star. The embryos continue to grow within their egg coverings. A. Q: Write a note on types of fertilisation in animals. Transgenic animals are those that have been genetically modified.. Theoretically, all living beings can be genetically manipulated. Examples: Fish, reptiles, amphibians, invertebrates. Animals with organ-system level of organisation the different types and examples of non-flowering plants on... The oviparous sharks, such as the horn shark, and oviparous rays, such as,. 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