Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology diseases and hygiene anaemia mosquito and human health non communicable diseases

Which of the following entered India as a contaminant of imported wheat and also is a major contributor to pollen allergy?

  1. Carrot grass

  2. Congress weed

  3. Parthenium

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parthenium which is commonly known as carrot grass or congress weed belongs to family Asteraceae come to India from the USA during 1950s famine mixed with the imported wheat and become a major weed plant as well a major cause of 

So, the correct is 'All of the above'.

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

In breeding a new genetic variety of a crop by hybridisation, superior recombinants are self pollinated for several generations till they reach a state of 

  1. Uniformity

  2. Heterozygosity

  3. Homozygosity

  4. Both (1) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

After the hybridization of two selected parent plant species, the recombinants with the desired combination of characters are selected. These hybrids are then self-pollinated for several generations so that they reach a state of uniformity or homozygosity so that the desired characters will not segregate in the progeny.

(Uniformity and Homozygosity are synonymous for the state of possessing two similar alleles for the same genes, one acquired from each parent.)
So, the correct answer is 'Uniformity' and 'Homozygosity'.

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

An improved insect resistant variety "Pusa Gaurav" is variety of _________

  1. <p> <font face="Times, serif">Brassica</font></p>

  2. Flat bean

  3. Cow pea

  4. Bhindi
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pusa Gaurav is an insect resistant variety of Mustard or Brassica that shows resistant against the aphids.

Hence, the correct answer is 'Brassica'

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

How many documented varieties of Basmati rice are grown in india.

  1. $2,00,000$
  2. $50,000$
  3. $1000$
  4. $27$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(D) 27 varieties of documented basmatic rice are grown in India. It is known for excellent cooking and eating qualities and many improved varieties using plant breeding are developed which give tolerance to many disease or climate also increased yield.

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

The desired varieties of economically useful crops can be produced by_________

  1. Vernalisation

  2. Mutation

  3. Natural selection

  4. Hybridisation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The mating or crossing of two plants or lines of dissimilar genotype is known as hybridization. 
  • The chief objective of hybridization is to create genetic variation when two genotypically different plants are brought together in F1. Segregation and recombination produce many new gene combinations in F2 and the later generations, i.e., the segregating generations. 
  • The degree of variation produced in the segregating generations would, therefore, depend on the number of heterozygous genes in the F1 which in turn depends upon the number of genes for which the two parents differ. 
  • The aim of hybridization may be the transfer of one or few qualitative characters, the improvement in one or more quantitative characters, or use the F1 as a hybrid variety. 
  • Breeding new crops are important for ensuring food security by developing new varieties that are higher-yielding, resistant to pests and diseases, drought-resistant or regionally adapted to different environments and growing conditions.

Therefore, the correct answer is option D.
Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

Classical plant breeding involves______________

  1. Crossing or hybridization of pure lines

  2. Artificial selection to produce plants with desired qualities

  3. Better yield, nutrition and resistance to disease

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Processes like the crossing of plants that have a pure line character, selection of plants that have desirable qualities and their artificial selection, obtaining a better yield of crops to improve nutrition and resistance to diseases are all parts of plant breeding. 

So, option D is the correct answer.

Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

Technology that involves purposeful manipulation of plant species for the development of high yielding and disease-resistant varieties are______________

  1. Green revolution

  2. Plant breeding and introduction

  3. Conventional plant breeding

  4. Hybridization and mutation breeding
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Hybridization is defined as the process of interbreeding between two individuals of different plant species to obtain a hybrid that contains the genes of both the parent species due to genetic recombination. 
  • The process of developing a new variety by changing the genome through X-ray or UV radiation is known as mutation breeding. It is a quick method to obtain genetic variation. 
  • These are the two techniques that can be used for the development of the plant variety which gives high yield and resistance to diseases. 

Thus, the correct answer is option D.