SS Subject Specialist Biology Solved MCQs Past Papers

(i) Enzyme Fumarase convert fumaric acid into:
(a) Citric acid
(b) Isocitric acid
(c) lactic acid
(d) Glutamic acid
(e) None of these

(ii) Plants growing under saline conditions are:
(a) Holophytes
(b) Mesophytes
(c) Hygrophytes
(d) Halophytes
(e) None of these

(iii) The first product of CO2 fixation in C3 plants is:
(a) Phosphoglyceric acid
(b) Glycolic acid
(c) Citric acid
(d) Glutamic acid
(e) None of these

(iv) Mutations are most likely to be caused by:
(a) 1AA
(b) CO2
(c) Dextrose
(d) Glycine
(e) None of these

(v) Most of the water absorption in plants takes place through:
(a) Root caps
(b) Root hairs
(c) Stomata
(d) All of these
(e) None of these

(vi) Oxygen produced during photosynthesis comes from:
(a) CO2
(b) Carboxylic acid
(c) Glucose
(d) Protein
(e) None of these

(vii) Chloroplasts in bundle sheath cells of C4 plants do not contain:
(a) Grana
(b) Stroma
(c) Thylakoids
(d) All of these
(e) None of these

(viii) A group of major biotic communities occupying a climatic region of earth is called:
(a) Biome
(b) Biosphere
(c) Biotype
(d) Phenotype
(e) None of these

(ix) In which group of plants stomata open during night:
(a) C3 plants
(b) C4 plants
(c) Halophytes
(d) CAM plants
(e) None of these

(x) The occurrence of vegetation in layers is known as:
(a) Scarification
(b) Stratification
(c) Physiognomy
(d) Pattern
(e) None of these

(xi) A plasmid is a:
(a) DNA
(b) RAN
(c) Protein
(d) Microsome
(e) None of these

(xii) The total Genetic material within a cell is:
(a) Gene bank
(b) Genetic load
(c) Genome
(d) Genetic Marker
(e) None of these

(xiii) Ribsomal RNA helps in:
(a) Replication
(b) Transcription
(c) Translation
(d) Translocation
(e) None of these

(xiv) Which one of the following ions plays most important role in stomatal movement?
(a) K+
(b) Ca++ (c) Cl–
(d) Na+
(e) None of these

(xv) Dormancy in seeds may be due to:
(a) Hard seed coat
(b) Chemical Inhibitors
(c) Immature embryo
(d) All of these
(e) None of these

(xvi) How many ATP molecules are produced when one hexose sugar molecule is converted into two molecules of pyruvic acid during glycolysis?
(a) 15
(b) 26
(c) 28
(d) 36
(e) None of these

(xvii) Open sea constituting about 90% of total ocean surface is called:
(a) Pelgaic zone
(b) Littoral zone
(c) Intertida zone
(d) Neritic zone
(e) None of these

(xviii) Which one of the following RNAs is non-genetic and brings amino acids to the site of protein synthesis?
(a) m RNA
(b) t RNA
(c) hn RNA
(d) pre-r RNA
(e) None of these

(xix) Transfer of material , from higher concentration to lower concentration across semipermeable membrane is called:
(a) Mass flow
(b) Osmosis
(c) Ascent of Sap
(d) Diffusion
(e) None of these

(xx) Optimum phosphorus uptake by roots takes place at:
(a) Neutral pH
(b) Acidic pH
(c) Alkaline pH
(d) All of these
(e) None of these


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