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Which of these describes viviparity correctly? 1. Development of the embryo inside a parent's body 2. Development of the embryo outside a parent's body 3. There are five modes of reproduction differentiated in animals 4. There are two modes of reproduction differentiated in animals

Which of these describes viviparity correctly? 1. Development of the embryo inside a parent's body 2. Development of the embryo outside a parent's body 3. There are five modes of reproduction differentiated in animals 4. There are two modes of reproduction differentiated in animals Correct Answer 1 and 3

  • Viviparity, among animals, is the development of the embryo inside a parent's body which eventually leads to live birth, unlike the reproduction by laying eggs.
  • There are five modes of reproduction differentiated in animals based on the relations between the parents and zygote. These are hemotrophic, histotrophic, ovoviviparity, placental and oviparity.

Related Questions

Which of the following statements refers to the process of 'parthenogenesis'? 1. It is a natural form of asexual reproduction in which the growth and development of embryos occur without fertilisation. 2. It is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. 3. It is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg inside of the female's body  Select the correct answer using the codes given below.
To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 candidates. Question B was answered correctly by 2,50,000 candidates. Question C was answered correctly by 2,60,000 candidates. Both questions A and B were answered correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. If the number of students answering all questions correctly is the same as the number answering none, how many candidates failed to clear the test?
Consider the following statements regarding recurrent type apomixis and choose the correct answer:
1. There is meiosis during the formation of megaspore
2. The embryo sac is diploid in nature
3. The embryo sac never develops from a cell of the archesporium
4. The development of embryo from a cell of an embryo sac other than egg is known as apospory
A. Those animals whose ears you can see have hair on their body. These animals give birth to the young ones. B. Those animals that do not have ears on the outside, do not have hair on their body. These animals lay eggs. The correct statements are -
Consider the following statements and choose the correct answer:
1. In Oenothera type of monosporic embryo sac, the embryo develops from the micropylar megaspore of the tetrad
2. Antipodal cells are altogether absent in Oenothera type
3. The genus Trapa forms an 8-nucleate embryo sac of the Polygonurn type
4. Oenothera type of embryo sac development has been found to be a characteristic feature of the entire family Onagraceae
Which of the following is/are the adaptive mechanism(s) of plants to avoid adverse conditions? 1. Dieback 2. Viviparity mode of reproduction 3. Pneumatophores 4. Dormant Select the correct answer using the code given below:
Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: Somatic embryogenesis in plants is a twostep process comprising of embryo initiation followed by embryo production.
Reason: Embryo initiation is independent of the presence of 2, 4-dichlorophenoxyacetic acid, whereas embryo production requires a high concentration of 2, 4-dichlorophenoxyacetic acid.
Consider the given statement and the following assumptions. Decide, which of the assumptions is implicit in the statement and choose your answer accordingly: Statement: The civic authority has decided that all the factories located inside the city limit be shifted outside to reduce the level of environmental pollution in the city. Assumptions: I. The pollution level in the city in future may reduce after these factories are shifted outside the city limit II. Enough usable land is available outside the city limit for these factories III. Many of these factories may shift to some other smaller towns to remain profitable
Directions : In each of the following questions a statement is given, followed by three conclusions. Give answer :

Statement : The civic authority has decided that all the factories located inside the city limits be shifted outside to reduce the level of environmental pollution in the city.

Assumptions :
I. The pollution level in the city in future may reduce after these factories are shifted outside the city limit.
II. Enough usable land is available outside the city limit for these factories.
III. Many of these factories may shift to some other smaller towns to remain profitable.
Consider the following statements regarding poloyembryony and choose the correct answer:
1. False polyembryony includes the development of two or more embryo sacs within the Same nucellus, and the embryos are derived from different embryo sacs
2. In cleavage polyembryony, the zygote instead of giving rise to one embryo produces embryos by cleavage
3. According to Jeffrey (1895), in Erythronium americanum the "embryogenic mass" forms two or three embryos