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