Plant Biotechnology — Part 1 MCQs with Explanations

From an unfertilized cell of female gametophyte is the correct answer to “Gynogenesis is a process of development of haploid plants”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Unfertilized eggs is the correct answer to “Parthenogenetic embryos in plants are those which are formed by”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Many explants from a single plant is the correct answer to “Large scale clonal propagation practically means raising a population of plantlets from”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Both (A) and (R) are true and (R) is the correct reason for (A) is the correct answer to “Determine the correctness or otherwise of the following Assertion (A) and Reason (R) . Assertion: In direct somatic embryogenesis, embryos are developed without going through callus formation. Reason: This is possible due to the presence of pre embryonically determined cells.”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Auxin is the correct answer to “The following are useful to introduce genes into crop plants except”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Both (A) and (R) are true and (R) is not the correct reason for (A) is the correct answer to “Determine the correctness or otherwise of the following Assertion (A) and the Reason (R) . Assertion: The enzymatic degradation of cell wall to obtain single cell called protoplast has helped immensely in developing somatic cell genetics in plants. Reason: In plants or animals, fusion of two cells must occur through the plasma membrane.”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Cry is the correct answer to “The Bt toxin gene from Bacillus thuringiensis used to generate genetically modified crops is”. This question is standard in competitive examination syllabi for Plant Biotechnology.

All of the above is the correct answer to “Embryo rescue is a useful technique to”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Pyrethrin is the correct answer to “Which one of the following plant secondary metabolites is a natural insecticide”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Totipotency is the correct answer to “Some living cells (e.g., plant cell) have the capacity to give rise to whole organism. The term used to describe this property is”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Clonal propagation is the correct answer to “Plant breeders have an advantage over animal breeders in reproducing a desired type offspring because the plant breeders can employ”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Vascular system is absent in the meristem is the correct answer to “Meristems escape virus invasion because”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Q, R is the correct answer to “Which of the following would result in somaclonal variation in micropropagated plants? P. Propagation by axillary branching in the absence of plant growth regulators. Q. Cell suspension maintained for five years before induction of somatic embryogenesis. R. Callus induction using 20 μM 2, 4-dichlorophenoxyacetic acid followed by shoot organogenesis. S. Shoot organogenesis from an explant in the absence of an intermediate callus phase.”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Globular → Heart → Torpedo → Cotyledonary is the correct answer to “Somatic embryo from cotyledon explant would develop in the following sequential stages”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Both (A) and (R) are true but (R) is not the correct reason for (A) is the correct answer to “Determine the correctness or otherwise of the following Assertion (A) and the Reason (R) . Assertion: It is possible to regenerate a whole plant from a single plant cell. Reason: It is easier to introduce transgenes into plants than animals.”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Colchicine is the correct answer to “Which one of the following is not a protoplast fusion inducing agent”. This question is standard in competitive examination syllabi for Plant Biotechnology.

P-4, Q-3, R-2, S-1 is the correct answer to “Match the plant hormones in Group I with functions in Group II . Group I Group II P. Gibberellic acid 1. Seed and bud dormancy Q. Zeatin 2. Fruit ripening R. Ethylene 3. Delaying leaf senescence S. Abscisic acid 4. Regulation of plant height”. This question is standard in competitive examination syllabi for Plant Biotechnology.

2, 4-D is the correct answer to “Enhanced axillary branching for multiple shoot production is promoted by”. This question is standard in competitive examination syllabi for Plant Biotechnology.

A monopolar structure that has a strong connection with the pre-existing vascular tissue of the explant is the correct answer to “Shoot organogenesis by tissue culture results into”. This question is standard in competitive examination syllabi for Plant Biotechnology.

[A] is true but [R] is false is the correct answer to “Determine the correctness or otherwise of the following Assertion [A] and the Reason [R] . Assertion [A]: A zygote and its immediate descendant cells are unspecialized and are called totipotent. Reason [R]: Totipotent cells retain the capacity to differentiate into only a few cell types.”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Provide defense mechanisms against microbial attack is the correct answer to “Plant secondary metabolites”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Both (A) and (R) are true and (R) is the correct reason for (A) is the correct answer to “Determine the correctness or otherwise of the following Assertion (A) and Reason (R) . Assertion: The production of secondary metabolites in plant cell cultures is enhanced by the addition of elicitors. Reason: Elicitors induce the expression of enzymes responsible for the biosynthesis of secondary metabolites.”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Helps to break dormancy of buds and bulbs is the correct answer to “When present in tissue culture medium, gibberellin”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Both A and B of the above is the correct answer to “Callus formation from mature tissue explant occurs through”. This question is standard in competitive examination syllabi for Plant Biotechnology.

P, R is the correct answer to “Identify the natural plant growth regulators from the following list. P. Zeatin Q. Benzylaminopurine (BAP) R. Indole-3-acetic acid (IAA) S. 2, 4-Dichlorophenoxyacetic acid”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Cytokinin is the correct answer to “Which one of the following is the growth factor used for growth of tissues and organs in plant tissue culture”. This question is standard in competitive examination syllabi for Plant Biotechnology.

P-3, Q-1, R-4, S-2 is the correct answer to “Match the promoters Listed in Group I with the tissues listed in Group II Group I Group II P. α-Amylase 1. Endosperm Q. Glutenin 2. Tuber R. Phaseollin 3. Aleurone S. Patatin 4. Cotyledon”. This question is standard in competitive examination syllabi for Plant Biotechnology.

The transformed genomic DNA are inherited maternally is the correct answer to “The transplastomic plants bear no risk for gene transfer through pollens as”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Such antibodies are free from other antigen of animal origin is the correct answer to “Which of the following statements is most appropriate for recombinant antibody production in transgenic plants”. This question is standard in competitive examination syllabi for Plant Biotechnology.

None of the above is the correct answer to “What would he the effect of addition of 2, 4-D on the production of berberine by cell culture of Thalictrum minus”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Clonal propagation is the correct answer to “Multiplication of genetically identical copies of a cultivar by asexual reproduction is known as”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Golden rice is the correct answer to “Which one of the following is a second generation genetically engineered crop”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Q and R only is the correct answer to “Which of the following combinations of plant hormones and their associated function are correct? Hormone Function P. Abscisic acid 1. Breaks seed dormancy Q. Auxin 2. Induces cell division R. Ethylene 3. Stimulates ripening of fruits S. Gibberellin 4. Promotes seed dormancy”. This question is standard in competitive examination syllabi for Plant Biotechnology.

All the above is the correct answer to “Tobacco leaf discs are transferred with Agrobacterium tumefaciens strain containing binary vector (GUS as reporter gene) with selectable marker neo (kanamycin resistance gene) and then regenerated to plants. The plants are kanamycin resistant, but leaf tissues are negative to GUS assay. The explanation is”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Tryptophan is the correct answer to “The plant hormone indole-3-acetic acid is derived from”. This question is standard in competitive examination syllabi for Plant Biotechnology.

P-2-c, Q-3-b, R--4-a, S-1-d is the correct answer to “Match the following plant sources with their secondary metabolites and medical uses. Source plant Secondary metabolites Medical use P. Belladonna 1. Menthol a. Cancer treatment Q. Foxglove 2. Atropine b. Heart disease R. Pacific yew 3. Digitalin c. Eye examination S. Eucalyptus 4. Taxol d. Cough”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Auxin and cytokinin is the correct answer to “Hormone pairs required for a callus to differentiate are”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Acetolactate synthase is the correct answer to “Resistance to herbicide chlorsulfuron in plants is due to change in”. This question is standard in competitive examination syllabi for Plant Biotechnology.

The pungent chemicals are stored as inactive conjugates and compartmentalized from the enzymes that convert them into active chemicals is the correct answer to “The pungency of mustard seeds is primarily due to secondary metabolites such as isothiocyanate and nitrile. The pungency is usually felt only when the seeds are crushed. This is because of”. This question is standard in competitive examination syllabi for Plant Biotechnology.

Agrobacterium plasmid integration is the correct answer to “Stable transformation of plants is reliably obtained by”. This question is standard in competitive examination syllabi for Plant Biotechnology.