HARD
Earn 100

A student working in a lab had three tubes with the following preparations:

(i) Freshly extracted nucleic acids dissolved in a buffer.

(ii) Chlorophyll extracted from spinach leaf.

(iii) Red coloured anthocyanin from onion cells.

The student used a spectrophotometer to determine the wavelength of light at which each preparation would show maximum absorption (absorption spectrum). She noted down the values in her notebook. However, when she came to the lab the next day, she realised that she had not mentioned the name of the sample preparation against each value. The values she recorded were 480 nm, 260 nm, and 642 nm. The respective values for the sample (i), (ii), and (iii) would most likely be:

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Important Questions on Use a model to illustrate how photosynthesis transforms light energy into stored chemical energy.

MEDIUM

Directions: Each of the following sentences in this section has a blank space and four words or group of words given after the sentence. Select the word or group of words you consider most appropriate for the blank space and indicate your response on the Answer Sheet accordingly.

Every rash driver becomes a ____ killer.

MEDIUM
A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of A benzanilide B aniline and C acetophenone. When the column is eluted with a mixture of solvents, hexane:ethyl acetate 20:80 , the sequence of obtained compounds is:
HARD
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?