Multiple Choice QuestionsWhich of the following are a group of micronutrients for plants
Fe, Mn, Cu, Mo, Zn
Fe, Mn, Cu, O, C
Cu, B, Cl, Fe, Ca
Ca, Mg, Fe
Match Column- I with Column - 2 and choose the correct option from below.
| Column - I | Column - II |
| A. Marginal placentation | (i) Sunflower |
| B. Axile placentation | (ii) Mustard |
| C. Parietal placentation | (iii) Lemon |
| D. Basal placentation | (iv) Pea |
A-(iv), B - (iii), C- (ii), D- (i)
A -(iv), B- (iii), C- (i), D - (ii)
A-(iv), B-(i), C- (ii), D - (iii)
A - (iii), B- (iv), C- (ii), D - (i)
Vernalisation is subjected to plants growing in
tropical areas
sub tropical areas
temperate areas
hot areas/arctic region.
The phenomenon that operates in the formation of root or shoot in a callus culture is
differentiation
re-differentiation
de-differentiation
re-juvenation
Which of the following genes do not occur naturally in living organisms
Bt genes
RNAi genes
Cry genes
Endogeneous cytoplasmic defence genes
D.
Endogeneous cytoplasmic defence genes
Bt genes, RNAi genes and Cry genes occur naturally in living organisms.
Bt toxic gene of bacterium Bacillus thuringiensis has been cloned from bacteria, and expressed in plants, to provide resistance to insects without the need of insecticides. The choice of genes depends upon the crop and the targeted pest as most Bt toxins are insect group specific. The toxin is coded by a gene named Cry.
RNAi takes place in all eukaryotic organisms as a method of cellular defence. This method involves silencing of a specific mRNA due to a complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing).
Choose the correct pair
Coconut, cucurbits - dioecious
Honeybee, Rotifers - parthenogenesis
Ornithorhyncus, Whale - viviparity
Frog, Peacock - external fertilisation
Select the incorrect statement.
Periplaneta has compound eyes.
Earthworm shows segmentation.
Ascaris shows sexual dimorphism.
Liver fluke has a complete alimentary canal
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