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Which one of the following produces nitrogen fixing nodules on the roots of Alnus?
Which one of the following statement is not true regarding gel electrophoresis technique?
In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to : (a) secretion of secondary metabolites and their deposition in the lumen of vessels. (b) deposition of organic compounds like tannins and resins in the central layers of stem. (c) deposition of suberin and aromatic substances in the outer layer of stem. (d) deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem. (e) presence of parenchyma cells, functionally active xylem elements and essential oils. Choose the correct answer from the options given below:
While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (-) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (-) for another species involved in the interaction ? (1) AMENSALISM (2) PREDATION (3) COMPENSALISM (4) PARASITISM
Given below are two statements : Statement I : Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance. Statement II : Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height. In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement I and Statement II are correct (2) Both Statement I and Statement II are incorrect (3) Statement I is correct but Statement II is incorrect (4) Statement I is incorrect but Statement II is correct
The appearance of recombination nodules on homologous chromosomes during meiosis characterizes :
Transposons can be used during which one of the following?
Which part of the fruit, labelled in the given figure makes it a false fruit?
Addition of more solutes in a given solution will :
Which of the following occurs due to the presence of autosome linked dominant trait ?
Biosystematics aims at...
Species are considered as...
One of the most important functions of botanical gardens is...
The living organisms can be unexceptionally distinguished from the non-living organisms on the basis of their ability for
Which one of the following aspects is an exclusive characteristic of living organisms ?
Which of the following animals is correctly matched with its particular taxonomic category?
Which organism is scientifically correctly named, correctly printed, and correctly described ??
The common characteristics between tomato and potato will be maximum at the level of their...
Which one of the following is not a correct statement? A. A museum has a collection of photographs of plants and animals B. Key is a taxonomic aid... C. Herbarium houses dried pressed specimens... D. Botanical gardens have living plants...
Select the two correct statements from the four given below Statement A. Definition of biological species was given by Ernst Mayr B. Photoperiod does not affect reproduction in plants C. Binomial nomenclature was given by R.H. Whittaker D. In unicellular organisms, reproduction is synonymous with growth