Home/Class 12/Biology/

Question and Answer

Vinegar is produced from sugars with the help of
Or
In the formation of ascorbic acid, the micro-organisme
(A) Lactobacillus
(B) Acetobacter
(C) Nitrosomonas
(D) Salmonella

Answer

Answer: B
Vinegar is most important acid being produced by two step fermentation of sugarcane juice by yeast and Acetobacter bacilli bacteria. Ascorbic acid (vitamin C) is produced by a complicated modification of glucose by different species of Asetobacter.
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
Correct48
Incorrect0
Watch More Related Solutions
In India coniferous forests are found in:
(A) Madhya Pradesh
(B) Himalaan region
(C) Satpura hills
(D) Rajathan
Solve that following equations :
\(\text{tantheta}+\text{tan}{\left(\theta+\frac{\pi}{{3}}\right)}+\text{tan}{\left(\theta+\frac{{{2}\pi}}{{3}}\right)}={3}\)
What is meant by the term "coordination number"?
b. What is the coordination number of atoms:
i. in a cubic-packed structure?
ii. In a body-centreds structure?
Obtain the first Bohr radius and the ground state energy of a muonic hydrogen atom (i.e., an atom in which a negatively charged muon \({\left(\mu\right)}\) of mass about \({207}{m}_{{e}}\) revolves around a proton).
Obtain approx. the ratio of the nuclear radii of the gold isotope \(._{{79}}{A}{u}^{{{197}}}\) and silver isotope \(._{{47}}{A}{{g}^{{{107}}}}\).
(i) If \({f}=+{0.5}{m}\), what is the power of the lens ?
(ii) The radii of curvature of the faces of a double convex lens are \({9}{c}{m}{\quad\text{and}\quad}{15}{c}{m}\). Its focal length is \({12}{c}{m}\). What is the refractive index of glass ?
(iii) A convex lens has \({20}{c}{m}\) focal length in air. What is the focal length in water ? (Refractive index of air-water \(={1.33}\), refractive index of air-glass \(={1.5}\)).
A 25 watt bulb emits monochromatic yellow light of wavelength of \({0}.{57}\mu\) m. Calculate the rate of emission of quanta per second .
The ejection of the photoelectron from the silver metal in the photoelectric effect exeriment can be stopped by applying the voltage of \({0.35}{V}\) when the radiation \({256.7}{n}{m}\) is used. Calculate the work function for silver metal.
Find the compound interest on Rs. 12000 for 10 years at the rate of 12%
per annum compounded annually.
If \({x}{\sin{{a}}}+{y}{\sin{{2}}}{a}+{z}{\sin{{3}}}{a}={\sin{{4}}}{a}\)

\({x}{\sin{{b}}}+{y}{\sin{{2}}}{b}+{z}{\sin{{3}}}{b}={\sin{{4}}}{b}\),

\({x}{\sin{{c}}}+{y}{\sin{{2}}}{c}+{z}{\sin{{3}}}{c}={\sin{{4}}}{c}\),

then the roots of the equation \({t}^{{3}}-{\left(\frac{{z}}{{2}}\right)}{t}^{{2}}-{\left(\frac{{{y}+{2}}}{{4}}\right)}{t}+{\left(\frac{{{z}-{x}}}{{8}}\right)}={0},{a},{b},{c},\ne{n}\pi,\)
are
(a)\({\sin{{a}}},{\sin{{b}}},{\sin{{c}}}\)
(b) \({\cos{{a}}},{\cos{{b}}},{\cos{{c}}}\)

(b)\({\sin{{2}}}{a},{\sin{{2}}}{b},{\sin{{2}}}{c}\)
(d) \({\cos{{2}}}{a},{\cos{{2}}}{b}{\cos{{2}}}{c}\)

Load More