In maize, hybrid vigour is exploited by
bombarding the seeds with DNA
crossing of two inbred parental lines
harvesting seeds from the most productive plants
harvesting seeds from the most productive plants
B.
crossing of two inbred parental lines
Hybrid varieties were first developed in maize, which is a cross-pollinated crop. In such crops, the parents of hybrid varieties are, ordinarily, inbred lines. A inbred line is a nearly homozygous line produced by continuous inbreeding in a cross-pollinated crop and is maintained by strict inbreeding. In maize, hybrid vigour or heterosis is exploited by crossing of two inbred parental lines.
In gymnosperms, the pollen chamber represents
a cell in the pollen grain in which the sperms are formed.
a cavity in the ovule in which pollen grains are stored after pollination
an opening in the megagametophyte through which the pollen tube approaches the egg
an opening in the megagametophyte through which the pollen tube approaches the egg
B.
a cavity in the ovule in which pollen grains are stored after pollination
In gymnosperms, the pollen chamber is a cavity in the ovule in which pollen grains are stored after pollination.
Main objective of production/use of herbicide resistant GM crops is to
eliminate weeds from the field without the use of manual labour
eliminate weeds from the field without the use of herbicides
encourage eco- friendly herbicides
encourage eco- friendly herbicides
D.
encourage eco- friendly herbicides
The chemical substances, which are sued to kill or repel pest are called pesticides. The pesticides, which are used to destroy weeds are called herbicides. Herbicides are used in agriculture to control the weeds. They inhibit plant growth by blocking the biosynthesis of amino acids or photosynthetic activities of plants. Transgenic plants resistant to several herbicides. eg, glyphosate, gluphsinate, sulphonylireas etc, have been successfully developed the main objective of production /use of herbicide-resistant genetically modified crops is to reduce herbicide accumulation in food articles for health safety.
Which one of the following pairs is mismatched?
Pila globosa - pearl
Apis indica - honey
kenia lacca - lac
kenia lacca - lac
A.
Pila globosa - pearl
Pearl is obtained from pearl oyster (Pinctada vulgaris) while honey from Apis indica, lac from kenia lacca and silk from Bombayx mori.
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