In plant breeding programmes, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called
selection of superior recombinants
cross- hybridisation among the selected parents
evaluation and selection of parents
germplasm collection
Which of the following is the best suited method for the production of virus free plants?
embryo culture
meristem culture
ovule culture
anther culture
The process in which mature differentiated cells reverse to meristematic activity to form callus is called
redifferentiation
dedifferentiation
cyto-differentiation
differentiation
Which of the following is an example of a defence used by plants against herbivorous?
I. Production of caffeine, tannin, quinine.
II. More production of non-woody tissues.
III. Production of hairs, thorns, spines.
IV. Production of hormones like chemicals that interfere with insect metamorphosis.
Select the correct codes
I and II
II, III and IV
I, II and III
I, III and IV
D.
I, III and IV
Production of caffeine, tannin, quinine are the examples of secondary metabolites, which are secreted by plant against herbivores.
Production of hormone like chemicals thorns, spines are also the strategy of plant to avoid grazing by herbivores.
Production of non-woody is not the adaptation for plant from predation.
On the basis of utility, Nagpuri buffaloes are categorized as
milkers
dual purpose
drought cattle
grazers
Which of the following plant is efficient converter of solar energy whose net productivity is 2-4 kg/m2/yr or even higher?
Wheat
Rice
Sugarcane
Bajra