Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which of the following is responsible for the mechanical support, protein synthesis and enzyme transport?

  • Cell membrane

  • Mitochondria

  • Dictyosome

  • Endoplasmic reticulum


12.

Thickening of arteries due to cholesterol deposition is

  • arteriosclerosis

  • rheumatic heart

  • blood pressure

  • cardiac arrest


13.

An example of competitive inhibition ofan enzyme is the inhibition of

  • succinic dehydrogenase by malonic acid

  • cytochrome oxidase by cyanide

  • hexokinase by glucose-6-phosphate

  • carbonic anhydrase by carbon dioxide


14.

Which of the following is the connecting link between glycolysis and Krebs cycle?

  • Acetyl Co- A

  • Oxalosuccinic acid

  • Pyruvic acid

  • Citric acid


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15.

Which of the following contain β-1, 4 linkage?

  • Maltose

  • Sucrose

  • Lactose

  • Fructose


16.

Which statement is true?

  • Adenine has 4 nitrogen atoms.

  • Cytosine has 3 nitrogen atoms

  • Guanosine has 3 nitrogen atoms

  • Uracil has 5 nitrogen atoms


17.

Which of the following helps in ascent of sap?

  • Root pressure

  • Transpiration

  • Capillarity

  • All of these


18.

Which of the following is correct set of micronutrient for plants?

  • Mg, Si, Fe, Cu, Ca

  • Cu, Fe, Zn, B, Mn

  • Mg, Fe, Zn, B, Mn

  • Mo, Zn, Cl, Mg, Ca


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19.

Velamen present in orchids helps in

  • absorption of nutrients from host plant

  • respiration

  • absorption of moisture from air

  • synthesising food


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20.

Hydroponics is

  • nutrient less culture

  • water less culture

  • soilless culture

  • none of these


C.

soilless culture

Hydroponics is a subset of hydroculture, which is a method of growing plants without soil by using mineral nutrient solutions in a water solvent. It is useful in areas having thin, infertile and dry soils. They conserve water. It can regulate pH optimum for a particular crop, control soil borne pathogens, avoid problems of weeding and obtain consistently better yield.


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