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

One of the main objectives of biotechnology is to minimise the use of insecticides on cultivated crops. Explain with the help of a suitable example how insect resistant crops have been developed using techniques of biotechnology.
→
Answer the following questions:
State and explain the law of dominance as proposed by Mendel.
→
As we know, our rivers Ganga and Yamuna are getting polluted day-by-day. Many factories discharge sewage effluents into these rivers. The load of pollution in these rivers also increases due to municipal sewage and many things thrown by people in the name of worship. The government has however taken some steps to save these rivers.
  1. What are the values shown by people who throw wastes in rivers?
  2. How could we help in decreasing pollution of rivers?
  3. State some advantages of saving the river
  4. State the action taken by the government to stop the pollution in these rivers.
→
Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.
→
Answer the following questions:
Draw a Graafian follicle and label antrum and secondary oocyte.
→
  1. Cancer is one of the most dreaded disease. Explain 'contact inhibition' and 'metastasis with respect to the disease.
  2. Name the group of genes that have been identified in normal cells that could lead to cancer. How do these genes cause cancer?
  3. Name any two techniques that are useful in detecting cancers of internal organs.
  4. Why are cancer patients often given a-interferon as part of the treatment?
→
  1. Draw the pyramids of biomass in a pond and in a forest. Explain giving reasons why the two pyramids are different.
  2. Pyramid of energy is always upright. Explain.
→
Describe the different methods for treatment of cancer.
→
  1. Why should we conserve biodiversity? How can we do it?
  2. Explain the importance of biodiversity hot-spots and sacred groves.
→
How bacterial cells are made competent to take up DNA?
→