C
CraftExam
medium difficulty9 min

Biotechnological Applications in Agriculture

Biotechnological applications in agriculture refer to the use of genetic engineering and related methods to develop crops with useful traits such as pest resistance, improved nutrition, and better agricultural productivity.

In one line: Bt means bacterium-based toxin: source, gene, toxin, target larva.

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Understand it

  • In agriculture, biotechnology is mainly used to introduce a specific gene into a crop so that the plant expresses a useful trait.
  • A genetically modified crop may produce a protein toxic to a pest, tolerate stress, or improve nutritional value.
  • Bt cotton is the standard example: a gene from Bacillus thuringiensis enables the cotton plant to produce an insecticidal protein that affects certain larvae.
  • Biofortified crops are another application, where nutritional quality such as vitamin, protein, or mineral content is improved.
  • In exams, students should explain the purpose, the source of the gene, and the benefit without claiming that all pests or all diseases are eliminated.

Example

Bt cotton contains cry genes from Bacillus thuringiensis. These genes help the plant produce Bt toxin in inactive form, which becomes active in the alkaline gut of susceptible insect larvae and damages their gut lining.

Rule to remember

Key biological rule: a transgene should express a useful trait in the host plant, and the trait must be explained through gene product and function, not by saying the crop has become a different species.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

Question: Explain how Bt cotton reduces pest attack.

  1. 1Answer: The cry gene from Bacillus thuringiensis is inserted into cotton.
  2. 2The plant produces inactive Bt protoxin.
  3. 3When a susceptible larva feeds on the plant, the toxin becomes active in its alkaline gut, binds to gut epithelial cells, creates pores, and causes larval death.

Method you can reuse

Identify the agricultural problem, name the biotechnological solution, mention the gene or trait, explain the mechanism, then state the agricultural benefit and one limitation or safety need if asked.

Visual tip

A useful diagram can show a crop plant cell receiving a Bt gene through a vector, followed by expression of Bt toxin in plant tissues. Labels: donor bacterium, cry gene, vector, plant cell, transformed plant, target insect larva.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

Why is Bt cotton considered a biotechnological application in agriculture?

Think first, then show answer
Bt cotton is a biotechnological application because a gene from Bacillus thuringiensis is introduced into cotton so the plant can produce a pest-specific toxin. This gives the crop protection against certain insect larvae and reduces pest damage.

Common wrong answer

Bt cotton is resistant to all pests and needs no pest management.

Don't mix this up

Students often write that Bt crops kill every insect. Bt toxins are usually specific to particular insect groups, so the answer must mention specificity.

Exam tip

For Bt crop answers, write three points clearly: source organism, introduced gene or toxin, and how the pest is affected.

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

How CBSE asks it

Usually asked as a short answer on Bt cotton, a case-based question on pest-resistant crops, or a long answer comparing GM crops, pest resistance, and biofortification.

Answer plan

Define GM crop, name the example, identify the gene source, explain gene expression and effect on the pest or nutrition, then state one agricultural advantage.
  1. 1

    Enough for 1 mark

    Biotechnological applications in agriculture refer to the use of genetic engineering and related methods to develop crops with useful traits such as pest resistance, improved nutrition, and better agricultural productivity.

  2. 2

    Add for 2 marks

    Example: Bt cotton contains cry genes from Bacillus thuringiensis. These genes help the plant produce Bt toxin in inactive form, which becomes active in the alkaline gut of susceptible insect larvae and damages their gut lining.

  3. 3

    Add for 3 marks

    In agriculture, biotechnology is mainly used to introduce a specific gene into a crop so that the plant expresses a useful trait.

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