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Q.66 Nitrogen, the main element contributing to the growth of plants in vitro and in-vivo is the constituent of A. Amino acids B. Certain hormones C. Co-factor of many enzymes […]

Q.65 Puccinia graminis tritici is a macro-cyclic rust fungi due to presence of A. Pycniospores B. Aeciospores C. Uredospores D. Teleutospores E. Basidiospores Choose the correct answer from the options […]

Q.64 The flavouring constituent of Ferula assa-foetida is the exudate collected A. from the surface of leaves B. from the surface of cut roots C. from the flowers D. from […]

Q.63 Possible sources of contamination of the nutrient medium in plant tissue culture are: A. the medium itself B. the culture vessel C. the explant D. the environment of the […]

Q.62 Properties of the genetic code are: A. composed of nucleotide triplets B. non overlapping except rare cases C. comma-free D. degenerate E. ordered Choose the most appropriate answer from […]

Q.61 Given below are two statements: Statement-I: Allopatric speciation requires thousands to millions of years and thousands of generations. Statement-II: Allopatric speciation occurs commonly in plants through polyploidy. In the […]

Q.60 Given below are two statements: Statement-I: An organism in which a chromosome, or a piece of a chromosome is over represented is referred to as a hypoploid. Statement-II: An […]

Q.59 Given below are two statements: Statement-I: The periderm is a protective tissue of secondary origin in angiosperms and gymnosperms. Statement-II: Periderm is the special type of protective tissue that […]

Q.58 Given below are two statements: Statement-I: Oxygen produced by algal photosynthesis allows the growth of aerobic bacteria. Statement-II: Commensal relationships are associations in which both the interacting organisms benefit […]

Q.57 Given below are two statements: Statement-I: Auxins delay the onset of leaf abscission. Statement-II: Abscisic acid promotes leaf senescence independently of ethylene hormone. In the light of the above […]