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Offsprings of oviparous animals are at greater risk of survival as compared to those of viviparous animals because

A
proper embryonic care and protection is absent

B
embryo does not develop completely

C
progenies are of smaller size

D
genetic variations do not occur

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In oviparous animals such as reptiles and birds, fertilised eggs are covered by hard calcareous shell and are laid in a safe place. After incubation period, young ones hatch out. In viviparous animals such as majority of mammals including human beings, the zygote develops into a young one inside the body of the female individual. After a certain growth, the young ones are delivered by the female individual. Due to proper care and protection, the chances of survival of young ones are more in viviparous individuals.
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Question 3
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same plant (bisexual) (Figure ) or on different plants (unisexual) (Figure ). In several fungi and plants, terms such as homothallic and monoecious are used to denote the bisexual condition and heterothallic and dioecious are the terms used to describe unisexual condition. In flowering plants, the unisexual male flower is staminate, some flowering plants, both male and female flowers may be present on the same individual (monoecious) or on separate individuals (dioeclous). Some examples of monoecious plants are cucurbits and coconuts and of dioecious plants are papaya and date palm. Name the type of gametes that are formed in staminate and pistillate flouers. But what about animals? Are individuals of all species either male or female (unisexual)? Or are there species which possess both the reproductive organs (bisexual)? You probably can make a list of several unisextual arumal species. Earthworms, (Figure a) sporge. tapeworm and leech, typical examples of bisexual animals that possess both male and female reproductive organs, are hermaphrodites. Cockroach (Figure ) is an example of a unisexual species . Cell division during gamete formation : Gametes in all heterogametic species are of two types namely, male and female. Gametes are haploid though the parent plant body from which they arise may be either haploid or diploid. A haploid parent produces gametes by mitotic division. Does this mean that meiosis never occurs in organisms that are haploid? Carefully examine the flow charts of life cycles of algae that you have studied in Class XI (Chapter 3) to get a suitable answer. Several organisms belonging to monera, fungi, algae and bryophytes have haploid plant body, but in organisms belonging to pteridophytes, gymnosperms, angiosperms and most of the animals including human beings, the parental body is diploid. It is obvious that meiosis, the reduction division, has to occur if a diploid body has to produce haploid gametes.
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Question Text
Offsprings of oviparous animals are at greater risk of survival as compared to those of viviparous animals because
TopicReproduction in Organisms
SubjectBiology
ClassClass 12
Answer TypeText solution:1
Upvotes139