Botany CSS Paper II 2008

(PART-1 MCQs) 30 Minutes MAXIMUM MARKS: 20
(PART—II) 2:30 Hours MAXIMUM MARKS: 80
NOTE: (i) First attempt PART-I (MCQs) on separate Answer Sheet which shall be taken back after 30 minutes.
(ii) Overwriting/cutting of the options/answers will not be given credit.

Q.1 Select the best option /Answer and fill in the appropriate Box on the Answer Sheet. (20)

(i) Plants growing in extremely dry conditions are called:
(a) Hydrophytes (b) Xerophytes (c) Mesophytes (d) Halophytes (e) None of these

(ii) Desert plants have elongated root system, because:
(a) Roots grow in search of water (b) High temperature of soil encourages root grow (c) Soil does not contain water hence becomes compact presses the roots to grow longer (d) Roots run more opposite to the sun heat (e) None of these

(iii) Recessive alleles arc expressed only in the:
(a) Homozygous condition (b) Presence of supporting gene (c) Heterozygous condition (d) Dikaryotic condition (e) None of these

(iv) The law that alleles for two different phenotypic characters are distributed into gametes randomly is termed:
(a) Law of segregation (b) Law of independent assortment (c) Law of dominance (d) Law of definite entity (e) None of these

(v) If tall pea plants of F 1 generation of the monohybrid cross are self crossed, the progeny F2 generation will have tall and dwarf plants in the ratio of:
(a) 3:1 (b) 1:3 (c) 1:1 (d) 2:1 (c) None of these

(vi) The science that deals with the study of living organisms in relation to their environment is called:
(a) Environmental science (b) Ecology (c) Evolutionary biology (d) Systematic biology (e) Nonc of these

(vii) Which of the following is increased due to vegetation in an area?
(a) Rainfall (b) Temperature (c) Wind velocity (d) All of these (e) None of these

(viii) Plant show maximum photosynthesis in:
(a) Pure blue light (b) Pure red light (c) Red and blue light (d) Green light (e) None of these

(ix) The seat of metabolic processes in the cell is mainly:
(a) Cell wall (b) Protoplasm (c) Mitochondria (d) Vacuole (e) None of these

(x) Carbon dioxide in the photosynthesis is:
(a) Oxidized (b) Reduced (c) Decarboxylated (d) Dehydrogenated (e) None of these

(xi) The enzymes that can be hydrolyse proteins are called:
(a) Peroxidases (b) Protcases (c) Amylases (d) Catalases (e) None of these

(xii) Which of the following will be higher in a sugar solution of 1 M as compared to 2M solution?
(a) Turgor pressure (b) Osmotic pressure (c) Diffusion pressure of solvent (d) Diffusion pressure of sugar (e) None of these

(xiii) Synthesis of chlorophyll in plants is adversely affected by:
(a) Mg deficiency (b) Ca deficiency (c) Oxygen deficiency (d) Fe deficiency (e) None of these

(xiv) Which of the following promotes more vegetative growth in plants?
(a) Nitrogen (b) Calcium (c) Iron (d) Zinc (e) None of these

(xv) Assimilatory power of plants refers to:
(a) Formation of ATP and NADPH (b) Reduction of CO2 (c) Splitting of water (d) Solar energy (e) None of these

(xvi) The rate of transpiration in leaves of the apple plant will be:
(a) Higher on lower side (b) Higher on upper side (c) Equal on both sides (d) Alternately high on both sides (e) None of these

(xvii) Mutation and natural selection are considered complementary to each other in the theory called:
(a) Classical Darwinism (b) Neo-Darwinism (c) Lamarckism (d) Weismannism (c) None of these

(xviii) In which type of fossils, original organism undergoes complete mineralization?
(a) Impression (b) Compression (c) Mould (d) Petrification (e) None of these

(xix) If forests are cleared for economic activity biodiversity of the area will be:
(a) Increased (b) Decreased (c) Unaffected (d) Fluctuating (e) None of these

(xx) Which of the following affects the plants but less the animals?
(a) Air pollution (b) Water pollution (c) Soil pollution (d) All of these (e) None of these

NOTE: (i) PART-II is to be attempted on the separate Answer Book.
(ii) Attempt ONLY FOUR questions from PART-II. All questions carry EQUAL marks. Illustrate your answers with suitable DIAGRAMS where necessary.
(iii) Extra attempt of any question or any part of the attempted question will not be considered.

Q.2. (a) Define plant growth hormone. Discuss the role of auxins in plant growth. (2 + 10)
(b) Describe the role of ethylene in fruit ripening. (8)

Q3. (a) Discuss the process of CO fixation in C3 and C4 plants. (6 + 6)
(b) Draw the Z-scheme of photosynthesis. (8)

Q.4. Write notes on the following: (5 x 4)
(i) TCA cycle (ii) Micronutrients (iii) Mechanism of enzyme action 4 (iv) Photophosphorylation

Q.5. (a) What is plant succession? Describe the process of plant succession starting in lake. (2 + 8)
(b) Write notes on: (i) Soil texture (ii) Food chain (5 + 5)

Q.6. Write short notes on the following: (5 x 4)
(i) Air pollution (ii) Energy flow in ecosystem (iii) Natural resources (iv) Climate zones

Q.7. (a) Describe the ultrastructure of Mitochondria. (10)
(b) Enlist the functions of Mitochondria. (6)
(c) What do you know about the evolution of Mitochondria? (4)

Q.8. (a) Describe the basis of laws of Segregation and Independent assortment presented by Gregor Mendel. (14)
(b) What are the characteristics of a model plant organism to study genetics? (6)


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