Tag: improvement if crop varieties

Quizzes (0) Questions (42)

Questions Related to improvement if crop varieties

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

The evolution of cultivated cotton is an example of _______________.

  1. Distant hybridization and polyploidy
  2. Diploidization of sterile $F _1$

  3. lntergeneric hybridization and polyploidy

  4. Interspecific hybridization and polyploidy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cultivated cotton (Gossypium hirsutum) evolved through the hybridization of two different species followed by polyploidy (allotetraploidy).

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

In crop improvement programmes, haploids are of  great importance because they ___________________.

  1. Grow better even under adverse climatic conditions

  2. Are useful in studies of meiosis.

  3. Have less requirement for energy inputs

  4. Give homozygous lines following diploidization
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Haploids are useful in plant breeding because they can be doubled (diploidized) to produce completely homozygous lines in a single generation.

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

Match List-I(Transgenic variety of crop) with List-II(Trait for which gene has been incorporated) and select the correct answer using the given the lists.

List-I List-II
a. Seed link maixe $1$. Virus resistance
b. Rainbow papaya $2$. Herbicide resistance
c. Flavor Savr tomato $3$. Altered ripening
$4$. Insect resistance
  1. A-$2$, B-$1$, C-$3$
  2. A-$2$, B-$3$, C-$1$
  3. A-$4$, B-$3$, C-$1$
  4. A-$4$, B-$1$, C-$3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

Find out the correct sentence.
(i) Hybridization means crossing between genetically dissimilar plants.
(ii) Cross between two varieties is called as inter specific hybridisation.
(iii) Introducing genes of desired character into a plant gives genetically modified crop.
(iv) Cross between plants of two species is called as inter varietal hybridisation.

  1. (i) and (iii)

  2. (ii) and (iv)

  3. (ii) and (iii)

  4. (iii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hybridisation is defined as the process of interbreeding between two genetically divergent individuals or two individuals of different species. Therefore, the statement (i) is correct.
Interspecific hybridisation means cross mating between two different species but sharing same genera. For example, a cross breed between a lion and a tiger, they both are from same genus Panthera but different species. So the statement that cross between two varieties is called interspecific hybridisation is wrong.
I am a brinjal farmer, my brinjals are being infected by some beetles every year. I spend a huge sum of money on insecticides and pesticides to protect my crop. Then, a biotechnology company approaches me with a new strain or variety of brinjal plants which have the capability to produce a natural pesticide that makes it resistant to the beetles. My crop is not only saved, but  I also get good yield of brinjals now and earn a lot of money. I do not have to spend extra money on pesticides and insecticides. Basically, I got a brinjal plant with gene of desired character and got a desired genetically modified brinjal plants. Therefore, the statement (iii) is correct.
When the parent plants cross bred are from the same species, but of different variety is called intervarietal hybridisation. For example, a cross bred between two different varieties of wheat plant. They belong to the same species but they are of different variety. Therefore, the statement (iv) is wrong.
Hence, we can conclude that (i) and (iii) are correct statements.

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

The technique of combining of desirable characteristics in one plant and then multiplying such individual to the extent that it is easily available for common use of farmers is know as crop improvement.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The  method of altering the genetic pattern of plants to increase their value and utility for human welfare, is called crop improvement or plant breeding. It is a purposeful manipulation of plants to create desired plant types that are better suited for cultivation, give better yield and are disease resistant. iit is purely depends on domestication.

So the given statement is true.