Plant Biotechnology MCQ Questions & Answers

31

What would he the effect of addition of 2, 4-D on the production of berberine by cell culture of Thalictrum minus?

A) To stimulate growth and thereby urease secondary metabolite production B) Stimulate dedifferentiation and thereby decrease secondary metabolite production C) Stimulate proliferation and reduce secondary metabolite production D) None of the above

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Answer & Solution

Answer: Option D

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32

Multiplication of genetically identical copies of a cultivar by asexual reproduction is known as

A) Aclonal propagation B) Vegetative propagation C) Polyclonal propagation D) Clonal propagation

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Answer & Solution

Answer: Option D

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33

Which one of the following is a second generation genetically engineered crop?

A) Bt brinjal B) Roundup soyabean C) Golden rice D) Bt rice

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Answer & Solution

Answer: Option C

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34

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

A) P and R only B) P and S only C) Q and R only D) Q and S only

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Answer & Solution

Answer: Option C

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35

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

A) The plants are transformed for both genes but GUS gene is turned B) The plants are transformed for only neo gene not the GUS gene C) The plants are not transformed at all, but the development of kanamycin resistance is due to somaclonal variation D) All the above

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Answer & Solution

Answer: Option D

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36

The plant hormone indole-3-acetic acid is derived from

A) Histidine B) Tyrosine C) Tryptophan D) Proline

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Answer & Solution

Answer: Option C

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37

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

A) P-2-c, Q-3-b, R--4-a, S-1-d B) P-3-c, Q-2-a, R-1-d, S-4-b C) P-2-c, Q-4-b, R-1-a, S-3-d D) P-1-b, Q-4-c, R-2-d, S-3-a

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Answer & Solution

Answer: Option A

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38

Hormone pairs required for a callus to differentiate are

A) Auxin and cytokinin B) Auxin and gibberellin C) Ethylene and gibberellin D) Cytokinin and gibberellin

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Answer & Solution

Answer: Option A

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39

Resistance to herbicide chlorsulfuron in plants is due to change in

A) Glutamine synthetase B) Acetolactate synthase C) Theronine deaminase D) DNA polymerase

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Answer & Solution

Answer: Option B

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40

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

A) The coat of the intact seeds blocks the pungent volatiles from being released B) The pungent chemicals are stored as inactive conjugates and compartmentalized from the enzymes that convert them into active chemicals C) The pungent chemicals are formed only after the reaction with atmospheric oxygen D) The pungent chemicals are formed only after the reaction with atmospheric carbon dioxide

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Answer & Solution

Answer: Option B

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Plant Biotechnology MCQ Questions & Answers | Biotechnology