XII Botany 2008
XII Botany
NOTE: Attempt any Three questions. Answer all the parts of a question together in sequence.
Q.1 (a) Fill in the blanks with the correct answers. (03)
i. The total genomic constitution of an individual is known as genome.
ii. The producer of a pond ecosystem is Hydrophytes.
iii. Plants growing in intense light are called helophytes.
iv. The study of the surface texture of the earth is termed Topography.
v. Mitosis is the basis of asexual reproduction.
vi. The colour of eye in drosophila is a sex-linked trait.
Q.1 (b) Explain tissue culture. (02)
Q.1 (c) Explain gene pool. (02)
Q.1 (d) What are Chromosomes? Give their chemical composition and ultra-structure. (05)
Q.2 (a) Write TRUE or FALSE for the following statements. (03)
i. Noise pollution is responsible for the physical and mental disorder. T
ii. Cacti plants are commonly found in deserts. T
iii. At high altitudes the exposure to sun and wind develops different types of vegetation. T
iv. The concentration of sea salt is generally 4.5 percent. F
v. During Meiosis number of chromosomes remains constant. F
vi. Algal bloom causes depletion of oxygen in a pond. F
Q.2 (b) What are Growth Correlations? (02)
Q.2 (c) What do you mean by a Gametophyte? (02)
Q.2 (d) What are phytohormones? Describe in detail the role of five kinds of plant hormones. (05)
Q.3 (a) Choose the correct answer for each from the given options. (03)
i. The blood group of a man with neither antigen is
(A group, AB group, O group, None of them)
ii. The plants get rid of surplus water by losing it in vapour form by the process called
(Osmosis, Guttation, Transpiration, Excretion)
iii. Which of the following may be considered a hereditary disease?
(Cholera, Cancer, Potato blight, Diabetes)
iv. To specify an amino acid genetic code uses
(One Base, Two Bases, Three Bases, Four Bases)
v. The chromosomes number in man is
(3 pairs, 13 pairs, 23 pairs, 33 pairs)
vi. Genetic material is considered as
(RNA, Nucleus, Ribosome, DNA)
Q.3 (b) What are the first and second lines of defense of plants against pathogens? (02)
Q.3 (c) Write down the uses and applications of Biotechnology in agriculture and medicine. (02)
Q.3 (d) Give the structure and mode of germination in dicot and monocot seeds. (05)
Q.4 (a) Match the items of Column A with those of Column B (03)
Column A
i. Topographic factor
ii. Diabetes mellitus
iii. Elephant grassland
iv. Sex chromosomes
v. Seedless fruit
vi. Spadix
Column B
a. Insulin
b. Savannah
c. Parthenocarpic
d. Spathe
e. Slope
f. XY
Answers
(e)
(a)
(b)
(f)
(c)
(d)
Q.4 (b) What is Vernalization? (02)
Q.4 (c) What is Photoperiodism? (02)
Q.4 (d) Define Biome and Biosphere. Describe desert ecosystem with special reference to Pakistan. (05)
Q.5 (a) Fill in the blanks with the correct answers. (03)
i. Mitotic apparatus is formed during prophase of cell division.
ii. The death of tissues due to injury is called necrosis.
iii. Adenine always pairs with thiamine and cytosine with guanine.
iv. Vector is a chromosome molecule into which a gene is inserted.
v. A pair of morphologically similar chromosome is called homologues.
vi. AB blood group is a universal acceptor.
Q.5 (b) Differentiate between Mitosis and Meiosis. (02)
Q.5 (c) Differentiate between Racemose and Cymose inflorescence. (02)
Q.5 (d) Explain Nitrogen Cycle in detail with respect to nitrogen fixation and loss of nitrogen. (05)
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