Lakshya Education MCQs

Question: Match the crop with disease against which it has acquired resistance

 Crop Resistance to diseasesaWheatiBacterial blightbBrassicaiiLeaf and stripe rustcCaulifloweriiiBlack rotdCowpeaivWhite rusteChillivChilly mosaic virus, Tobacco mosaic virus, Leaf curl
Options:
A.a - ii, b - iv, c - iii, d - i, e - v
B.a - ii, b - iii, c - iv, d - i, e - v
C.a - iv, b - ii, c - iii, d - i, e - v
D.a - ii, b - iv, c - iii, d - v, e - i
Answer: Option A
: A

Disease resistance has been bred into many crop varieties for bacterial and fungal pathogens. Wheat cultivar, has been bred for resistance to diseases like leaf and stripe rust, a fungal disease, that causes a rust like layer to appear on the parts affected. Brassica is resistant to white rust, a disease that causes a white colored rust like layer to appear on plant tissues or causes white blisters on the plant tissues that are above the ground. Cultivars of cauliflower are resistant to black rot. Cowpea is resistant to bacterial blight. A chilli cultivar, Pusa sadabahar that is resistant to the Chilli mosaic virus, Tobacco mosaic virus and Leaf curl virus has been developed.

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Question 1. Haploid plants are preferred over diploids for mutation study because in haploids
  1.    Recessive mutation express immediately
  2.    Induction of mutation is easier
  3.    Culturing is easier
  4.    Dominant mutation express immediately
Answer: Option A
: A

Haploid plants are useful in mutation studies becausea recessive mutation will be observed immediately in a haploid plant as the genotype can be identified from the phenotype. In case of diploid plants,a recessive mutation of a dominant gene will be covered by a corresponding dominant allele and the mutation will not be observed until segregation. So haploid plants are preferred over diploids for mutation study because of their clear/obvious expression.
Question 2. The capacity to generate a whole plant from any cell/explants is called:
  1.    Pluripotency
  2.    Cell cloning        
  3.    Tissue culture
  4.    Totipotency
Answer: Option D
: D

Totipotency is the genetic potential of a plant cell to produce the entire plant. In other words, totipotency is the cell characteristic in which the potential for forming all the cell types in the adult organism is retained.
Cell cloning: The process of producing a group of cells that are genetically identical (clones) to a single ancestral cell.
Pluripotency :
A pluripotent cell can create all cell types except for extra embryonic tissue.
Tissue culture is the invitro culture of plants.
Question 3. Rohu, Catla and Commom Carp are products of:
  1.    Inland fisheries
  2.    Coastal fisheries
  3.    Deep sea fisheries
  4.    Estuarine fisheries
Answer: Option A
: A

Inland fisheries are ones in which fishing is done in freshwater bodies, such as lakes, ponds, rivers and tanks. Rohu, Catla and the common carp are some important freshwater fishes of India.
Question 4. Inbreeding increases the frequency of ___.
  1.    Homozygosity
  2.    Heterozygosity
  3.    Genetic diversity
  4.    Genetic linkage
Answer: Option A
: A

Inbreeding increases the frequency of homozygosity. For example, if we started off with a set of parents such that each have one copy of the gene for increased milk production and one copy of regular milk production, using the punnett square, we can deduce that there is a 25% chance of the progeny being a purely high milk producer carrying both copies of the superior gene. Over time, we can breed individuals that have both copies of the superior gene (MM) thereby ensuring that 100% of the progeny are now superior individuals (as shown in the second Punnett square).

Question 5. A place where hives of honey bees are reared for honey ___

: An apiary is a place where honey bees are reared for honey.
Question 6. Which is true for emasculation?

 
  1.    Done in bisexual flowers to prevent self-pollination
  2.    Done in unisexual flowers to prevent cross-pollination
  3.    Done in staminate flower to prevent self-pollination
  4.    Done in pistillate flower to prevent self-pollination
Answer: Option A
: A

When performing artificial hybridisation, it is necessary that the stigma is pollinated with pollen collected from a desired male parent. If the flower chosen as the female parent is bisexual, the anthers are removed manually in a process called emasculation. This is done to prevent self-fertilisation in the female parent.

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