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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 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
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
The megasporangium tissue acts as nutritive element for the embryo.
What is the use of biochar in farming? 1. Biochar can be used as a part of the growing medium in vertical farming. 2. When biochar is a part of the growing medium, it promotes the growth of nitrogen-fixing microorganisms. 3. When biochar is a part of the growing medium, it enables the growing medium to retain water for longer time. Which of the statements given above is/are correct?
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
During a tennis match, A Player served 60 serves, 48 of the serves were successful. What is the percentage of the successful serves?
Read the following passage and answer the item that follows. Your answers to this item should be based on the passage only. The IMF has pointed out that the fast growing economies of Asia face the risk of falling into 'middle-income trap'. It means that average income in these countries, which till now have been growing rapidly, will stop growing beyond a point - a point that is well short of incomes in the developed West. The IMF identifies a number of causes of middle-income trap-none of which is surprising-from infrastructure to weak institutions, to less than favorable macroeconomic conditions. But the broad, overall cause, says IMF, is a collapse in the growth of productivity. Which among the following is the most logical, rational and critical inference that can be made from the above passage?
Which amongst the following refers to the nutritive tissue in the seeds of higher plants?
Which of the climate shows the given characteristics? Suitable for low growing mosses, lichens and flowering plants Region of permafrost where the subsoil is permanently frozen During summer very long duration of daylight Short growing season and waterlogging support only low growing plants