Which one of the following helps in absorption of phosphorus from soil by plants?
Anabaena
Glomus
Rhizobium
Frankia
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A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this? (a) Lots of urea and phosphate fertilizer were used in the crops in the vicinity (b) The area was sprayed with DDT by an aircraft (c) The lake water turned green and stinky (d) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake? |
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Selection of homozygous plant is |
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Necrosis, or death of tissue particularly leaf tissue, is due to the deficiency of |
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An organism used as biofertilizer for raising soybean crop is |
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Plants having similar genotypes produced by plant breeding are called |
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In tissue culture medium, the embryoids formed from pollen grains is due to |
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Which of the following is free living aerobic and nonphotosynthetic nitrogen fixing bacterium? |
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Haploid plantlets can be produced by |
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Somaclones are obtained by |
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Identify the edible freshwater teleost |
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