Plant Breeding mcq pdf

Quiz 3

21) Who discovered split gene ?

(A) P. Chambor

(B) Johanssen

(C) P. Leader

(D) P.Sharp and R.Roberts

Correct Answer :­P.Sharp and R.Roberts 

22) Rate of mutation in nature is­

(A) 1x105

(B) 1x108

(C) 1x10­5

(D) 1x1012

Correct Answer :­1x10­5 

23) Artificial synthesis of mRNA was done by ?

(A) M.Nirenberg (1951)

(B) H.G. Khurana

(C) Okha (1955)

(D) F. Griffith

Correct Answer :­H.G. Khurana 

24) Role of ‘Single Stranded Binding’ (SSB) protein in DNA replication is­

(A) Separator Primer

(B) Stabilizes Unwounded DNA

(C) Prevents Supercoiling

(D) None of above

Correct Answer :­Stabilizes Unwounded DNA  

25) Clover leaf model of t­RNA was proposed by.

(A) Nirenberg & Mathai

(B) Robert Holley

(C) Okha

(D) H.G.Khurana

Correct Answer :­Robert Holley 

26) In DNA replication the Okazaki fragments on the lagging strand are joined together by.

(A) Helicase

(B) DNA Ligase

(C) DNA Polymerase

(D) Correct Answer :­DNA Ligase 

27) According to Meselson & Stahl experiment of DNA replication, DNA molecules are centrifuged in CsCl density gradient, they separate on the basis of ?

(A) Mass Number 

(B) Volume

(C) Density

(D) All of above

Correct Answer :­All of above 

28) In meiosis, chromosomes are reduplicated during­

(A) Prophase I

(B) Prophase II

(C) Interphase

(D) Inter Kinesis

Correct Answer :­Interphase 

29) After a m­RNA has been translated and leaves the ribosome or polysome, it is.?

(A) Dehydrated

(B) Degraded

(C) Dehydrolysed

(D) Oxidised

Correct Answer :­Degraded 

30) In mitosis, just after duplication, the two sister chromatids remain attached at­

(A) Spindle

(B) Asters

(C) Centromere

(D) Centrioles

Correct Answer :­ Centromere 

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Plant Pathologists are scientists concerned with the understanding of the

dynamic processes involved in the plant health. Plant Pathology is defined as the study of the organisms and environmental conditions that cause disease in plants, the mechanisms by which this occurs, the interactions between these causal agents and the plant (effects on plant growth, yield and quality), and the methods of managing or controlling plant disease. Plant breeding has been practiced for thousands of years, since near the beginning of human civilization. It is practiced worldwide by individuals such as gardeners and farmers, or by professional plant breeders employed by organizations such as government institutions, universities, crop-specific industry associations or research centers.