NEET Botany PYQs

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

Match List I with List II:

	List-I		List-II
A.	Two or more alternative forms of a gene	I.	Back cross
B.	Cross of F1 progeny with homozygous recessive parent	II.	Ploidy
C.	Cross of F1 progeny with any of the parents	III.	Allele
D.	Number of chromosome sets in plant	IV.	Test cross

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Match List I with List II:

	List-I		List-II
A.	Clostridium butylicum	I.	Ethanol
B.	Saccharomyces cerevisiae	II.	Streptokinase
C.	Trichoderma polysporum	III.	Butyric acid
D.	Streptococcus sp.	IV.	Cyclosporin-A

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In the given figure, which component has thin outer walls and highly thickened inner walls?

Which of the following is an example of actinomorphic flower?

A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and down stream end:

What is the fate of a piece of DNA carrying only gene of interest which is transferred into an alien organism?

A. The piece of DNA would be able to multiply itself independently in the progeny cells of the organism.
B. It may get integrated into the genome of the recipient.
C. It may multiply and be inherited along with the host DNA.
D. The alien piece of DNA is not an integral part of chromosome.
E. It shows ability to replicate.

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Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin:

Which one of the following can be explained on the basis of Mendel's Law of Dominance?

A. Out of one pair of factors one is dominant and the other is recessive.
B. Alleles do not show any expression and both the characters appear as such in F2 generation.
C. Factors occur in pairs in normal diploid plants.
D. The discrete unit controlling a particular character is called factor.
E. The expression of only one of the parental characters is found in a monohybrid cross.

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Given below are two statements:

Statement I: Bt toxins are insect group specific and coded by a gene cry IAc.

Statement II: Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut.

In the light of the above statements, choose the correct answer from the options given below: