Page 344 - DEDU504_EDUCATIONAL_MEASUREMENT_AND_EVALUATION_ENGLISH

Educational Measurement and Evaluation

Notes (iii) illustrate : Give one example of osmosis from your daily life.
(iv) relate : Which organelle in Amoeba is concerned with osmo-regulation ?
(v) compare : What is the difference between endosmosis and exosmosis ?
(vi) classify : List two biological phenomena of endosmosis and two of
exosmosis from your daily life.
(vii) detect : Diagram of a plasmolysed cell of Spirogyra is given in the opposite
side. Detect the mistake if any and rectify. (diagram to be provided)
(viii) interpret : A fresh-water species of Amoeba has a contractile vacuole, but it
is absent in a marine species. What does it indicate ?
(ix) explain : A potato chip when put in water becomes turgid. Why ?
(x) analyse : Species X of Amoeba when put in sea water lost its contratile
vacuole (CV). On what basis can you say that it is a marine or
fresh-water species ?
(xi) hypothesise : When marine Amoeba adapts to fresh water, it develops CV but
when fresh-water Amoeba adapts to sea water it loses its CV.
Propose a hypothesis to explain these observations.
(xii) suggest : Suggest an experimental procedure to test the above-mentioned
hypothesis, (xi above)
(xiii) reason : When after heavy chemical manuring a grassy lawn is watered,
the grass dries up after some days. Why ?
(xiv) infer : In which case the pickle would last longer: the one with the salt or
the one without salt ? Why ?
(xv) predict : What will happen to a freshwater species of Amoeba when it is
transferred to sea water and gets adapted ?
(xvi) judge : When a freshly cut potato chip is kept in salt water, it limps after
a few hours because of the phenomenon of endosmosis.
Is the statement (a) valid and (b) the reasoning given consistent ?
2. Ensure maximum possible coverage of content elements
Since expected response in SAQ is short, care may be taken not to test bits of information but
a good chunk of content.
(i) Give one characteristic of plants. (least coverage)
(ii) Give one characteristic of water plants. (more coverage)
(iii) Give one characteristic of water plants different from that of desert plants.
(still more coverage)
Mark (1) remaining the same, the last SAQ is the best for syllabus coverage.
3. Never make a SAQ completely free-response type.
SAQ should remain a restricted variety of open-ended questions,
(i) Describe uses of medicinal plants, (not SAQ) (Poor)
(ii) Write short note on allotropy. (not SAQ) (Poor)
(iii) Name the scientist who invented telephone, (not SAQ) (Poor)
(iv) List three chemical properties of ammonia gas. (SAQ) (Good)
4. Indicate clearly the scope of intended answer.
(i) Give two examples of modified stems. (More options for answering)
(ii) Give two examples of underground stems. (Clear intended scope)

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