Use of genetically modified crops is a possible better solution for increases yields because .
(I) Agrochemicals are too expensive .
(II) Agrochemicals show harmful effects on the enviroment.
(III) Conventional breeding methods are not sufficient .
Correct answer is .

During achieving ''Green Revolution '' increased yields are mainly due to . (I) Improved crop varieties . (II) Better management paractices . (III) Use of agrochemicals .

Read the following statements about genetically engineered plants. Select the ones that are advantageous . I. The increased yield from genetically engineered plants allows a smaller area of land to be farmed. II. Generally engineering plants may have improved nutritional value . III. Some plants can be genetically modified to give resistance to diseases. IV. There is more research needed on the long term effects of genetically engineered crops on the environment V. The use of genetically engineered crops may explain the increase in allergies in children

Sterilisation techniques are generally fool proof methods of contraception with least side effects. Yet, this is the last option for the couples because (i) It is almost irreversible (ii) of the misconception that it will reduce sexual urge/drive (iii) it is a surgical procedure (iv) of lack of sufficient facilites in many parts of the country Choose the correct option

During monsoon days, a blue green layer was developed on moist soil of village streets making them slippery. On the instruction of science teacher Ghanshyam collected this upper slippery layer of soil from the village street and dried it. Then he added this powder to this crop field. He got very good crop yield without using any fertilizers (i) Which group of organisms is responsible for this blue green layer ? (ii) What is the possible reason for increased crop yield after addition of blue green layer to the fields (iii) Name one blue green alga which do nitrogen fixation (iv) Name one blue green alga which is a good source of protein.

Read the following and answer questions from Q.1. to Q.5. given below: Plants having foreign genes in their genome through genetic engineering are called transgenic plants. Genes can be incorporated either through a vector or through direct introduction of DNA. Bt cotton is a genetically modified organism which is pestresistant. It contains gene cry I Ac and cry II Ab of Bacillus thuringiensis. It is used to control lepidopterans, coleopterans and dipterans. Bt cotton can resist cotton bollworm and produce higher yields. Cry gene produces cry protein or Bt toxin. It is an endotoxin which remains as protoxin in plants and converted to active toxin after getting ingested by the insects. Alkaline pH of the insect gut solubilizes the protein crystals, the activated toxin creates pores to the mid guts wall of theinsects which cause them to death. What is true about Bt cotton crops?

Read the following and answer questions from Q.1. to Q.5. given below: Plants having foreign genes in their genome through genetic engineering are called transgenic plants. Genes can be incorporated either through a vector or through direct introduction of DNA. Bt cotton is a genetically modified organism which is pestresistant. It contains gene cry I Ac and cry II Ab of Bacillus thuringiensis. It is used to control lepidopterans, coleopterans and dipterans. Bt cotton can resist cotton bollworm and produce higher yields. Cry gene produces cry protein or Bt toxin. It is an endotoxin which remains as protoxin in plants and converted to active toxin after getting ingested by the insects. Alkaline pH of the insect gut solubilizes the protein crystals, the activated toxin creates pores to the mid guts wall of theinsects which cause them to death. Identify which of the following is not an advantage of GM crops?