Page 101 - Biology - XII

COMPETENCY BASED QUESTIONS

Multiple Choice Questions

Q1. Carotenoids

(a) are orange-yellow (b) occur in association with chlorophyll
(c) photosynthetic (d) all of these
Q2. Lycopene is

(a) a white substance in plants (b) a chemical
(c) a red pigment of tomato (d) an end product

Q3. Chlorophyll a (C H O N Mg) has a molecular weight of
55 72 5 4
(a) 888 (b) 893 (c) 993 (d) 933

Q4. The pigment present in green sulphur bacteria is
(a) absent (b) red-green
(c) chlorobium chlorophyll (d) bacteriochlorophyll

Q5. Orange-yellow carotenoids occur in
(a) all green plants (b) fruits and fl owers (c) stem (d) none of these

Answer key
1. (d), 2. (c), 3. (b), 4. (c), 5. (a)

PROJECT - 4

OBJECTIVE
To study the release of heat energy during respiration.

Principle/Theory
1. In respiration, a part of energy produced is in the form of heat and the rest is in other form (ATPs).
2. Respiration has two important functions—
(a) It is the process that results in formation/production of highly reactive compounds. Out of which
cell constituents are formed.
(b) It is the process that releases energy from food.

Materials Required
Seeds (grams, peas), three thermometers, three thermos fl asks, fl ask, spirit lamp, tripod stand, wire gauze,
matchbox, water, mercuric chloride, and corks

Procedure
1. Take three thermos fl asks and mark them A, B, and C.
2. Take gram/peas seeds. In a fl ask marked A, put little (100 g) of dry seeds. In a fl ask marked B, put
100 g of soaked gram/peas seeds. And in a fl ask marked C, put 100 g of seeds previously killed by
boiling with water for fi ve minutes.

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