Improvement if crop varieties - class-VIII
Description: improvement if crop varieties | |
Number of Questions: 42 | |
Created by: Vinaya Modi | |
Tags: improvement in food resources biology food production and management natural resources and agriculture food production challenges in improving agricultural production |
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
An improved insect resistant variety "Pusa Gaurav" is variety of _________
Calculate the amount of $(NH _4) _2SO _4$ in $'g'$ which must be added to $500ml$ of $0.2\,M\,NH _3$ to yield a solution of $pH=9.35$ given $p^{k _b} (NH _3)=4.74$.(Given $10^{-0.09}=0.812$)
How many documented varieties of Basmati rice are grown in india.
The desired varieties of economically useful crops can be produced by_________
Classical plant breeding involves______________
Technology that involves purposeful manipulation of plant species for the development of high yielding and disease-resistant varieties are______________
Method of preserving favourable variants and elimination of undesirable plants is termed as________
Which of these is not a major group of activities for improving crop yield?
The crosses are made between two different species of the same genus is known as
Choose the correct statement.
The trait which is accounted for hybridization is
Which of the following practices can be related to hybridisation?
.......... is a sterile hybrid which spreads by rhizome division
Which of the following is not applicable to biological species concept?
Total number of meiotic division required for forming $100$ zygotes/ $100$ grains of wheat is?
Amber coloured Wheat produced from red coloured Mexican Wheat is
Pulses usually lack amino acids
Purity of seed is guaranteed by
Assertion : Paraguay tea is obtained from Paullinia cupana
Reason :Tea is obtained from Camellia sinensis
Which of the following is an introduced variety of crop
The evolution of cultivated cotton is an example of _______________.
In crop improvement programmes, haploids are of great importance because they ___________________.
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 |
Which of the following are required for the development of hybrid rice seed production?
Norine-$10$ is?
Triticale is the first man-made cereal crop. The combination of parents involved in its production is Tritium.
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.
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.
In hybridisation the haploids combine the advantage of
Recently there was a controversy regarding the plantation of
Opuntia weed can be eradicated by
What makes the bread soft and fluffy?
Triticale is a man-made cereal which has been developed through hybridization between_____________
The main aim of plant breeding is_____________
Select the wrongly matched pair.
The science of improving crop varieties is called as____________________
The aim of plant breeding is to produce_____________
The first artificial interspecific plant hybrid was produced by
.......... is responsible for hybridization.
In crop improvement programme, haploids are important because they
Genetic diversity in agricultural crops is threatened by -