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The length of E. coli DNA and length of DNA in a human 2N cell is:
The length of DNA double helix in a typical mammalian cell is 2.2 metres.
It is calculated by multiplying the total number of bp with distance between two consecutive bp.
= 6.6 × 109 bp × 0.34 × 10^-9m/bp
= 2.2 metres.
In E.coli, the length of DNA is 1.36 mm.
(page-99)
Continued inbreeding can cause inbreeding depression. Whenever, this becomes a problem, selected animal of the breeding population should be mated with:
A single outcross will overcome this problem.
The best plant explant to raise virus free plant is:
Meristems are generally immune to virus infection
What step actually brings about the improvement in the crop?
1. Once you select the progeny with desired characters you will accomplish the purpose. This selection is vital in plant breeding experiments
The agriculture practice of breeding and raising livestock is called as:
Read page 165, XII NCERT
Which of the following is the most important factor that would lead to increased milk yield in cattle ?
read page 166, XII NCERT
Amongst the following the number of fresh water fishes is:
Catla, Rohu, Common carp, Hilsa, Sardines, Mackerel, Pomfrets
Read page 169, XII NCERT
A group of animals related by descent and similar in most characters like general appearance, features, size, configuration, etc., are said to belong to a:
Variety is used for plants and strains for microbes.
The purposeful manipulation of plant species in order to create desired plant types that are better suited for cultivation, give better yields and are disease resistant is called:
1. Read page 170, XII NCERT
Hisardale is a new breed of:
Read page 168, XII NCERT
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