Biotechnology in Agriculture

IMPORTANT

Biotechnology in Agriculture: Overview

This topic covers concepts such as Biotechnological Applications in Agriculture, Bt Cotton, Pest Resistant Plants, RNA Interference, Flavr Savr Tomato, Golden Rice, Biotechnology and its Applications, and Bt Brinjal.

Important Questions on Biotechnology in Agriculture

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Choose the mechanism that is used in the tobacco plants that are introduced with nematode-specific using certain vectors.

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Identify the cry-genes that control corn borer:

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Identify the source of cry genes from the given options:

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Transgenic tobacco plants are protected against:

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Gibberellins (GA) are hormones required for stem elongation and thereby the overall height of the plant. Bioactive GA binds to its receptor and subsequently activates the gene expression leading to stem growth. In the absence of GA, the SLR1 repressor blocks transcription of GA-inducible genes. GA binds to a receptor GID1 in the nucleus and the GA-GID1 complex then binds to the SLR1 repressor. Formation of GA-GID1-SLR1 complex leads to degradation of SLR1. This event unlocks the transcriptional activator allowing it to transcribe the GA-inducible genes. Based on this information, the correct statement(s) is(are)

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The DNA that has been introduced in tobacco plants to provide resistance against nematode, produces 

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Which method of crop improvement can be practised by a farmer if he is inexperienced? 

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The roots of the _____ plant are most commonly infested by nematode Meloidegyne incognitia.

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Bt toxin produced by Bacillus thuringiensis does not kill the producer because the toxin is

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The novel strategy used to prevent the infestation of roots of the tobacco plant by nematode Meloidegyne incognitia makes use of the

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Match the following:

List - I List - II List - III
A) Hairy leaves i) Animal manure and
sewage
I. Potato
B) Spirulina ii) Bacterial blight II. Jassids in cotton
C) Apical meristem iii) Resistance to pests III. Cowpea
D) Pusa Komal iv) Disease Resistance IV. Rich with protein

The correct answer is-

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RNA interference (RNAi) is a mechanism that

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Assertion (A): Bt transgenic crops are more tolerant to abiotic stresses.

Reason (R): Bt toxins are coded by 'cry' genes.

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In addition to the production of high yielding and disease-resistant varieties, genetic modification has:
i) helped to reduce post-harvest losses
ii) decreased the nutritional value of food
iii) reduced reliance on chemical pesticides
iv) decreased the efficiency of mineral usage by plants
v) produced crops that are resilient to environmental stresses
The correct combination is

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Choose the incorrect statements among the following:
A) Genetically modified crops have less tolerance to abiotic stress like heat and drought.
B) The proteins encoded by the genes Cry I Ac, and Cry II Ab control cotton bollworm, while Cry I Ab control corn stem borer.
C) RNA I takes place in all organisms as a method of cellular defence.
D) Hereditary diseases can be treated through gene therapy.

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Which among the following parasitizes the tobacco plant?

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Study the following statements and select the incorrect ones.
i. $\mathrm{Bt}^{\prime}$ in $\mathrm{Bt}$ cotton' indicates that it is a nongenetically modified crop produced through biotechnology.
ii. The anticoagulant 'hirudin' is being produced from transgenic Brassica napus seeds.
iii. 'FlaviSavr' transgenic tomatoes remain fresh for a longer period than the normal tomato variety.
iv. Golden rice is a transgenic variety of Oryza sativa, which is rich $\beta$ -carotene and helps to prevent colour blindness.

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In RNA interference, genes are silenced using