Recent questions tagged botany

Through which cell of the embryo sac, does the pollen tube enter the embryo sac-

asked Jul 24, 2018 by pady_1

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The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport -

asked Jul 24, 2018 by pady_1

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E. coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because -

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When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is :-

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If you are provided with root-tips of onion in your class and are asked to count the chromosomes which of the following stages can you most conveniently look into :-

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Phenetic classification of organisms is based on:-

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Common indicator organism of water pollution is :-

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Which of the following propagates through leaf- tip :-

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A nutritionally wild type organism, which does not require any additional growth supplement is known as :-

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Which form of RNA has a structure resembling clover leaf ?

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Recently Govt. of India has allowed mixing of alcohol in petrol. What is the amount of alcohol permitted for mixing in petrol :-

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In which of the following pairs is the specific characteristic of a soil not correctly matched :-

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An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having -

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One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies that mutation is found in -

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Plants adapted to low light intensity have :-

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In the ABO system of blood groups if both antigens are present but no antibody, the blood group of the individual would be :-

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A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is :-

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Cell elongation in internodal regions of the green plants takes place due to :-

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The most abundant element present in the plant is :-

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The technique of obtaining large number of plantlets by tissue culture method is called –

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Photosynthetically active radiation (PAR) represents the following range of wave length

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The following ratio is generally constant for a given species :-

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India's wheat yield revolution in the 1960s was possible primarily due to :-

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A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh :-

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In the somatic cell cycle :-

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Dough kept overnight in warm weather becomes soft and spongy becauses of :-

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Crossing over that results in genetic recombination in higher organisms occurs between :-

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The maximum growth rate occurs in :-

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Flagella of prokaryotic and eukaryotic cells differ in :-

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One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant ?

asked Jul 24, 2018 by pady_1

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Which one of the following preceeds re- formation of the nuclear envelope during M phase of the cell cycle :- lood

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The most thoroughly studied of the known bacteria-plant interactions is the :-

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What is a keystone species ?

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The telomeres of eukaryotic chromosomes consist of short sequences of -

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In which one of the following habitats does the diurnal temperature of soil surface vary most ?

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Which one of the following is living fossil -

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In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order :-

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After a mutation at a genetic locus the character of an organism changes due to the change in :-

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In a plant red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt

asked Jul 24, 2018 by pady_1

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During replication of a bacterial chromosomes DNA synthesis starts from a replication origin site and :-

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Certain characteristic demographic features of developing countries are -

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In your opinion, which is the most effective way to conserve the plant diversity of an area :-

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Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-

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Which of the following is expected to have the highest value $(gm/m^ 2/yr)$ in a grassland ecosystem : -

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Lichens are well known combination of an alga and a fungus where fungus has :-

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A self-fertilizing trihybrid plant forms :-

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In glycolysis, during oxidation electrons are removed by -

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In chloroplasts, chlorophyll is present in the :-

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Edible part of mango is :-

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Angiosperms have dominated the land flora primarily because of their -

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