Multiple Choice Questions

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Introduction of foreign genes for improving genotype is

  • biotechnology

  • vernalization

  • tissue culture

  • genetic engineering


D.

genetic engineering

Genetic Engineering is the introduction of foreign genes for improving genotype. It is a technique of manipulating prokaryotic and eukaryotic DNA. It allows breaking of a DNA molecule at two desired places to isolate a specific DNA segment and then its insertion in another DNA molecule at a desired position. The product thus obtained is called r DNA and the technique as genetic engineering.


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If a homozygous red flowered plant is crossed with a homozygous white flowered plant, the offspring would be

  • half red-flowered

  • all red-flowered

  • half white-flowered

  • half pink-flowered.


Adults of Wuchereria bancrofti attacks

  • excretory system

  • nervous system

  • digestive system

  • lymphatic system


Green muffler is used against which type of pollution ?

  • Air

  • Soil

  • Water

  • Noise


Which of the following is involved in allergic reaction?

  • lgM

  • IgM and lgG

  • IgA

  • lgE


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Megasporophyll of Cycas has the same nature as

  • stamen

  • petal

  • sepal

  • carpel


When the filament runs throughout the length of anther, it is called

  • adnate

  • dorsi fixed

  • versatile

  • syngenesious


Xenia and metaxenia terms are related with

  • pollen culture

  • xylem and phloem

  • endosperm

  • embryo


Elater mechanism for seed dispersal is exhibited by

  • Riccia

  • Dryopteris

  • Funaria

  • Marchantia


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Pure line breed refers to

  • heterozygosity only

  • heterozygosity and linkage

  • homozygosity only

  • homozygosity and self assortment