Download App

Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYBiotechnology and its Applications5 Marks
Question
How have pest-resistant plants been produced using biotechnology? Explain.
✓

Answer

Pest resistant plants:
  • A nematode Meloidegyne incognitia infects the roots of tobacco plants which reduces the production of tobacco.
  • It can be prevented by using RNA interference (RNAi) process which is checked by silencing of specific mRNA due to a complementary dsRNA.
  • dsRNA binds and prevents translation of the mRNA (silencing).
  • By using Agrobacterium vectors, nematode-specific genes were introduced into the host plants which produce both sense and anti-sense RNA in the host cells.
  • These two RNAs are complementary to each other and form a double-stranded RNA (dsRNA) that initiates RNAi and hence silence the specific mRNA of the nematode.
  • The parasite cannot survive in the transgenic host, so protects the plants from pests.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Biotechnology and its Applications→Biotechnology and its Applications — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

(i) Write full name of AIDS.
(ii) Write four ways of transmission of HIV infection.
(iii) Write a way to prevent HIV infection.
→
Human female is not fertile after menopause whereas males can produce gametes at any age after puberty. Analyse the statement and schematically represent a comparison between gametogenesis in males and females.
→
Write notes on ex-situ conservation of biodiversity
→
Explain the following with reason :
→
State the three principles of Mendel’s law of inheritance.
→
Explain the process of transcription in a prokaryote.

OR

 Describe the process of transcription in a bacterium.

→
Answer the following questions:
Why is banana called a parthenocarpic fruit? Would you call banana a true fruit? Give reason in support of your answer.
→
  1. Explain the process of spermatogenesis in humans.
  2. Draw a human sperm and label acrosome and middle piece. Mention their functions.
→
Taking examples under each category, discuss upstream and downstream processing.
→
No evidence was found on a crime scene, other than only a few hair strands. The inspector wants to proceed for DNA fingerprinting, but the amount of DNA is very less.
  1. In your opinion what could be the solution to this problem?
  2. Write the basic steps of this technique.
  3. Name the scientist who developed this technique.
  4. What values shown by the inspector?
→