Carboxylation reaction of phase I in Calvin cycle is catalysed by which of the following?
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According to Niel's observation of photosynthesis,
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Who among the following was first to work on embryo culture?
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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
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
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In which of the following monocotyledons, two cotyledons are formed instead of one?
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Which of the following plants bears protogynous flowers?
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Consider the following statements and choose the correct answer:
1. Low temperatures inhibit germination of the light-sensitive Grand Rapids lettuce seeds
2. High temperatures inhibit germination of the light-sensitive Grand Rapids lettuce seeds
3. High temperatures can substitute for red-light promotion of light-sensitive lettuce seeds
4. Low-temperature promotion of lettuce seed germination is less efficient with respect to time than is red-light promotion
1. Low temperatures inhibit germination of the light-sensitive Grand Rapids lettuce seeds
2. High temperatures inhibit germination of the light-sensitive Grand Rapids lettuce seeds
3. High temperatures can substitute for red-light promotion of light-sensitive lettuce seeds
4. Low-temperature promotion of lettuce seed germination is less efficient with respect to time than is red-light promotion
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Ribulose biphosphate carboxylase, the main enzyme of Calvin cycle that fixes CO2, acts as ribulose biphosphate oxygenase under
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When chlorophyll solutions are treated with dilute acids, a waxy olive-green substance is produced known as
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The infectious plant diseases which spread widely but occur periodically are called
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Which of the following seems the most appropriate energy level responsible for electron transfer in the reduction of a chemical acceptor and the initiation of the electron flow for ATP production?
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Which of the following act as antisenescent hormones in leaves?
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What is the impact of advancing glaciers on the rings of trees?
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There is a loss of enzyme activity when denaturation of proteins occurs at a temperature ranging between
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When an organ grows at an intermediate angle i.e. between 0° to 90° or between 90° to 180° from the vertical, it is said to be
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The seeds of certain plants fail to germinate, if they do not pass through the digestive tract of fruit-eating birds. This is due to
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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
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
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Each biome blends with the next through a fairly broad transition region known as
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Consider the following statements and choose the correct answer:
1. The immediate precursor of gibberellin is the diterpene kaurene
2. The gibberellins are compounds consisting of the ent-gibberellane skeleton or ent-20 norgibberellane
3.The gibberellins are easily inter-convertible in the organism by changes in the hydroxyl substitutions
1. The immediate precursor of gibberellin is the diterpene kaurene
2. The gibberellins are compounds consisting of the ent-gibberellane skeleton or ent-20 norgibberellane
3.The gibberellins are easily inter-convertible in the organism by changes in the hydroxyl substitutions
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Total soil-moisture stress represents
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