Q. Which one of the following statements is true with regard to the greenhouse?
1) The shorter-wavelength infrared radiations from the Sun can enter into the greenhouse while longer-wavelength infrared radiations from the ground and the plants inside the greenhouse cannot pass back out through the glass
2) The shorter wavelength infrared radiation from the Sun can enter into the greenhouse and the longer wavelength infrared radiation from the ground and the plants inside the greenhouse can also pass back out through the glass
3) The shorter-wavelength infrared radiations from the Sun cannot enter into the greenhouse while longer-wavelength infrared radiations from the ground and the plants inside the greenhouse can pass back out through the glass
4) No infrared radiation can pass through the glass of the greenhouse
Q. The disease rickets develops in children due to the deficiency of -
1) Vitamin C
2) Vitamin D
3) Vitamin A
4) Vitamin B
Q. Plants prepare glucose in the process of -
1) respiration
2) photosynthesis
3) degradation
4) mineral absorption
Q. Which one of the following statements is correct about cell membranes?
1) It is made up of cellulose
2) It is a permeable structure for all substances
3) It is flexible and enables the cell to engulf many materials
4) It does not allow the diffusion of gases like oxygen and carbon dioxide
Q. Suppose, due to an accident, the delicate lining of the mouth and the oesophagus of a person is injured. In this case, which one of the following tissues will be affected?
1) Smooth muscle
2) Cuboidal epithelium
3) Squamous epithelium
4) Striated muscle
Q. Which one of the following statements is not correct with regard to genetically modified organisms?
1) In this technique, a gene from one organism is isolated and transferred to the cell of another organism
2) This technique has applications only in plants
3) Genes for insect resistance may spread from crop plants to wild plants
4) To produce a transgenic animal the novel genes are inserted at a very early stage of development
Q. Which one of the following statements is true when non-metals are dissolved in water?
1) They produce basic oxides
2) They produce acidic oxides
3) They produce neutral oxides
4) They provide hydroxides
Q. The number of saturated and unsaturated bonds in cyclohexane is -
1) 9 and 0 respectively
2) 18 and 3 respectively
3) 18 and 0 respectively
4) 9 and 3 respectively
Q. While burning hydrocarbon fuels, if we see a yellow flame with lots of black smoke, it means that the fuel is -
1) made of saturated hydrocarbons
2) made of unsaturated hydrocarbons
3) burning completely
4) wet
Q. What is the number of moles of 'He' is 104 g of helium gas?
1) 52
2) 26
3) 13
4) 6.5
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