The proteins encoded by the genes cryIAc and cryIIAb control the cotton ________.

[Biotechnology-and-its-Applications] [class-xii ]

• leaf miners
• bollworms
• aphids
• corn borers
Correct Option: B  [ bollworms ]

Remark: The proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms.

The Bt toxin gene designated cryIAb controls the ________.

[Biotechnology-and-its-Applications] [class-xii ]

• cotton bollworms
• tobacco budworm
• corn borer
• armyworm
Correct Option: C  [ corn borer ]

Remark: The gene cryIAb controls corn borer.

The nematode ________ infects the roots of tobacco plants and causes a great reduction in yield.

[Biotechnology-and-its-Applications] [class-xii ]

• Caenorhabditis elegans
• Ascaris lumbricoides
• Meloidegyne incognitia
• Trichinella spiralis
Correct Option: C  [ Meloidegyne incognitia ]

Remark: The nematode Meloidegyne incognitia infects the roots of tobacco plants.

A novel strategy to prevent nematode infestation was based on the process of RNA ________ (RNAi).

[Biotechnology-and-its-Applications] [class-xii ]

• replication
• interference
• silencing
• amplification
Correct Option: B  [ interference ]

Remark: The strategy adopted against the nematode was based on RNA interference (RNAi).

RNAi involves silencing a specific mRNA due to a complementary ________ molecule that binds to and prevents translation.

[Biotechnology-and-its-Applications] [class-xii ]

• dsDNA
• ssRNA
• dsRNA
• ssDNA
Correct Option: C  [ dsRNA ]

Remark: RNAi involves silencing a specific mRNA due to a complementary dsRNA (double-stranded RNA) molecule.

RNA interference (RNAi) takes place as a method of cellular defense in all ________ organisms.

[Biotechnology-and-its-Applications] [class-xii ]

• prokaryotic
• viral
• eukaryotic
• bacterial
Correct Option: C  [ eukaryotic ]

Remark: RNAi takes place in all eukaryotic organisms.

Nematode-specific genes were introduced into the host plant using ________ vectors to generate dsRNA.

[Biotechnology-and-its-Applications] [class-xii ]

• Retroviral
• Plasmid
• Bacteriophage
• Agrobacterium
Correct Option: D  [ Agrobacterium ]

Remark: Nematode-specific genes were introduced using Agrobacterium vectors.

Recombinant therapeutics do not induce unwanted ________ responses, unlike products isolated from non-human sources.

[Biotechnology-and-its-Applications] [class-xii ]

• inflammatory
• allergic
• immunological
• neurological
Correct Option: C  [ immunological ]

Remark: Recombinant therapeutics do not induce unwanted immunological responses.

At present, about ________ recombinant therapeutics have been approved for human use worldwide.

[Biotechnology-and-its-Applications] [class-xii ]

• 10
• 12
• 20
• 30
Correct Option: D  [ 30 ]

Remark: About 30 recombinant therapeutics have been approved worldwide.

In India, ________ recombinant therapeutics are presently being marketed.

[Biotechnology-and-its-Applications] [class-xii ]

• 10
• 12
• 20
• 30
Correct Option: B  [ 12 ]

Remark: 12 recombinant therapeutics are presently being marketed in India.