NEET Botany MCQs

The gaseous plant growth regulator is used in plants to:

• 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

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

• 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

Identify the incorrect statement related to Pollination:

• 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

Given below are two statements:<br> <i>Statement I:</i> Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance.<br> <i>Statement II:</i> 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.<br> In the light of the above statements, choose the correct answer from the options given below:

• 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

XO type of sex determination can be found in:

• Drosophila
• Birds
• Grasshoppers
• Monkeys

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

• 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

DNA polymorphism forms the basis of:

• Genetic mapping
• DNA finger printing
• Both genetic mapping and DNA finger printing
• Translation

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

• B, D and E Only
• A, C and D Only
• B and E Only
• A, C and E Only

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

• 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.

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

• 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