The gaseous plant growth regulator is used in plants to:

NEET-2022 Plant-Growth-and-Development [class-xi ]

• speed up the malting process
• promote root growth and root hair formation to increase the absorption surface
• help overcome apical dominance
• kill dicotyledonous weeds in the fields
Correct Option: B  [ promote root growth and root hair formation to increase the absorption surface ]

Remark:

Given below are two statements:
Statement I: Cleistogamous flowers are invariably autogamous.
Statement II: Cleistogamy is disadvantageous as there is no chance for cross pollination.
In the light of the above statements, choose the correct answer from the options given below :

NEET-2022 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• Both Statement I and Statement II are correct
• Both Statement I and Statement II are incorrect
• Statement I is correct but Statement II is incorrect
• Statement I is incorrect but Statement II is correct
Correct Option: A  [ Both Statement I and Statement II are correct ]

Remark:

Identify the incorrect statement related to Pollination:

NEET-2022 Sexual-Reproduction-in-Flowering-Plants [class-xii ]

• Pollination by water is quite rare in flowering plants
• Pollination by wind is more common amongst abiotic pollination
• Flowers produce foul odours to attract flies and beetles to get pollinated
• Moths and butterflies are the most dominant pollinating agents among insects
Correct Option: D  [ Moths and butterflies are the most dominant pollinating agents among insects ]

Remark:

Given below are two statements:
Statement I: Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance.
Statement II: Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour, flower colour, pod shape and colour, flower position and stem height.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2022 Principles-of-Inheritance-and-Variation [class-xii ]

• Both Statement I and Statement II are correct
• Both Statement I and Statement II are incorrect
• Statement I is correct but Statement II is incorrect
• Statement I is incorrect but Statement II is correct
Correct Option: A  [ Both Statement I and Statement II are correct ]

Remark:

XO type of sex determination can be found in:

NEET-2022 Principles-of-Inheritance-and-Variation [class-xii ]

• Drosophila
• Birds
• Grasshoppers
• Monkeys
Correct Option: C  [ Grasshoppers ]

Remark:

The process of translation of mRNA to proteins begins as soon as:

NEET-2022 Molecular-Basis-of-Inheritance [class-xii ]

• The small subunit of ribosome encounters mRNA
• The larger subunit of ribosome encounters mRNA
• Both the subunits join together to bind with mRNA
• The tRNA is activated and the larger subunit of ribosome encounters mRNA
Correct Option: A  [ The small subunit of ribosome encounters mRNA ]

Remark:

DNA polymorphism forms the basis of:

NEET-2022 Molecular-Basis-of-Inheritance [class-xii ]

• Genetic mapping
• DNA finger printing
• Both genetic mapping and DNA finger printing
• Translation
Correct Option: C  [ Both genetic mapping and DNA finger printing ]

Remark:

Read the following statements and choose the set of correct statements:
A. Euchromatin is loosely packed chromatin
B. Heterochromatin is transcriptionally active
C. Histone octomer is wrapped by negatively charged DNA in nucleosome
D. Histones are rich in lysine and arginine
E. A typical nucleosome contains 400 bp of DNA helix
Choose the correct answer from the options given below:

NEET-2022 Molecular-Basis-of-Inheritance [class-xii ]

• B, D and E Only
• A, C and D Only
• B and E Only
• A, C and E Only
Correct Option: B  [ A, C and D Only ]

Remark:

Which one of the following statement is not true regarding gel electrophoresis technique?

NEET-2022 Biotechnology-Principles-and-Processes [class-xii ]

• The process of extraction of separated DNA strands from gel is called elution.
• The separated DNA fragments are stained by using ethidium bromide.
• The presence of chromogenic substrate gives blue coloured DNA bands on the gel.
• Bright orange coloured bands of DNA can be observed in the gel when exposed to UV light.
Correct Option: C  [ The presence of chromogenic substrate gives blue coloured DNA bands on the gel. ]

Remark:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Polymerase chain reaction is used in DNA amplification.
Reason (R): The ampicillin resistant gene is used as a selectable marker to check transformation
In the light of the above statements, choose the correct answer from the options given below :

NEET-2022 Biotechnology-Principles-and-Processes [class-xii ]

• Both (A) and (R) are correct and (R) is the correct explanation of (A)
• Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• (A) is correct but (R) is not correct
• (A) is not correct but (R) is correct
Correct Option: B  [ Both (A) and (R) are correct but (R) is not the correct explanation of (A) ]

Remark: