Which of the following can be used as a biocontrol agent in the treatment of plant disease?

NEET-2019 Microbes-in-Human-Welfare [class-xii ]

• Anabaena
• Chlorella
• Trichoderma
• Lactobacillus
Correct Option: C  [ Trichoderma ]

Remark:

Select the correct group of biocontrol agents.

NEET-2019 Microbes-in-Human-Welfare [class-xii ]

• Bacillus thuringiensis,Tobacco mosaic virus, Aphids
• Oscillatoria, Rhizobium, Trichoderma
• Trichoderma, Baculovirus, Bacillus thuringiensis
• Nostoc, Azospirillium, Nucleopolyhedrovirus
Correct Option: C  [ Trichoderma, Baculovirus, Bacillus thuringiensis ]

Remark:

Following statements describe the characteristics of the enzyme Restriction endonuclease. Identify the incorrect statement.

NEET-2019 Biotechnology-Principles-and-Processes [class-xii ]

• The enzyme binds DNA at specific sites and cuts only one of the two strands.
• The enzyme cuts DNA molecule at identified position within the DNA
• The enzyme cuts the sugar-phosphate backbone at specific sites on each strand.
• The enzyme recognizes a specific palindromic nucleotide sequence in the DNA
Correct Option: A  [ The enzyme binds DNA at specific sites and cuts only one of the two strands. ]

Remark:

Pinus seed cannot germinate and establish without fungal association. This is because:

NEET-2019 Organisms-and-Populations [class-xii ]

• it has obligate association with mycorrhizae.
• its embryo is immature
• it has very hard seed coat.
• its seeds contain inhibitors that prevent germination.
Correct Option: A  [ it has obligate association with mycorrhizae. ]

Remark:

Match Column - I with Column - II.

NEET-2019 Organisms-and-Populations [class-xii ]

• (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
• (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
• (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
Correct Option: D  [ (A)-(II), (B)-(III), (C)-(IV), (D)-(I) ]

Remark:

Which of the following ecological pyramids is generally inverted?

NEET-2019 Ecosystem [class-xii ]

• Pyramid of biomass in a sea
• Pyramid of biomass in a forest
• Pyramid of energy
• Pyramid of numbers in grassland
Correct Option: A  [ Pyramid of biomass in a sea ]

Remark:

Which of the following is the most important causes for animals and plants being driven to extinction?

NEET-2019 Biodiversity-and-Conservation [class-xii ]

• Alien species invasion
• Economic exploitation
• Drought and floods
• Habitat loss and fragmentation
Correct Option: D  [ Habitat loss and fragmentation ]

Remark:

Which one of the following is not a method of in situ conservation of biodiversity?

NEET-2019 Biodiversity-and-Conservation [class-xii ]

• Biosphere Reserve
• Botanical Garden
• Wildlife Sanctuary
• Sacred Grove
Correct Option: B  [ Botanical Garden ]

Remark:

The Earth Summit held in Rio de Janeiro in 1992 was called:

NEET-2019 Biodiversity-and-Conservation [class-xii ]

• for conservation of biodiversity and sustainable utilization of its benefits.
• to reduce CO2 emissions and global warming.
• to assess threat posed to native species by invasive weed species.
• for immediate steps to discontinue use of CFCs that were damaging the ozone layer.
Correct Option: A  [ for conservation of biodiversity and sustainable utilization of its benefits. ]

Remark:

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:

NEET-2019 Environmental-Issues [class-xii ]

• benign growth on mucous lining of nasal cavity.
• proliferation of fibrous tissues and damage of the
• inflammation of bronchi and bronchioles.
• reduction in the secretion of surfactants by pneumocytes.
Correct Option: C  [ inflammation of bronchi and bronchioles. ]

Remark: