Botany MCQs Past Papers of SS Subject Specialist in pdf. SS Botany Solved mcqs notes downlad in pdf.
(i) NADH from the Krebs cycle is approximately equal to:
(a) 2 ATP
(b) 3 ATP
(c) 4 ATP
(d) 6 ATP
(e) None of these
Answer: (e) None of these
(ii) In mitochondrial electron transport chains, the final acceptor is:
(a) H2O
(b) H2O2
(c) NAD+
(d) FAD
(e) None of these
Answer: (a) H2O
(iii) The movement of water from cell to cell via plasmodesmata is called:
(a) Symplastic
(b) Transmembrane
(c) Apoplastic
(d) Facilitated
(e) None of these
Answer: (a) Symplastic
(iv) In maize plant, the CO2 fixation mechanism is called pathway:
(a) C3 pathway
(b) C4 pathway
(c) CAM pathway
(d) C3 – C4 intermediate
(e) None of these
Answer: (b) C4 pathway
(v) Salt-loving plants are known as:
(a) Glycophytes
(b) Halophytes
(c) Xerophytes
(d) Mesophytes
(e) None of these
Answer: (b) Halophytes
(vi) With the addition of solution to a liquid system, the water potential of the system:
(a) Increases
(b) Decreases
(c) Remains stable
(d) Remains variable
(e) None of these
Answer: (b) Decreases
(vii) The conversion of pyruvate into acetyl CoA is called:
(a) Glycolysis
(b) Fermentation
(c) Oxidative carboxylation
(d) Beta-Oxidation
(e) None of these
Answer: (c) Oxidative carboxylation
(viii) Between adenine and thymine, there are:
(a) Two hydrogen bonds
(b) Three hydrogen bonds
(c) One hydrogen bond
(d) Four hydrogen bonds
(e) None of these
Answer: (a) Two hydrogen bonds
(ix) The stage of meiosis in which pairing of homologous chromosomes starts is called:
(a) Leptotene
(b) Zygotene
(c) Diplotene
(d) Pachytene
(e) None of these
Answer: (b) Zygotene
(x) The site on a chromosome where a gene is located is called:
(a) Allele
(b) Locus
(c) Site
(d) Trait
(e) None of these
Answer: (b) Locus
(xi) In a dihybrid cross, the ratio of the F2 generation is:
(a) 9:3:3:1
(b) 3:1
(c) 1:2:1
(d) 1:1
(e) None of these
Answer: (a) 9:3:3:1
(xii) When a single gene has multiple effects, the phenomenon is called:
(a) Codominance
(b) Epistasis
(c) Pleiotropy
(d) Genostasis
(e) None of these
Answer: (c) Pleiotropy
(xiii) Lamarck’s theory of evolution was published in:
(a) 1807
(b) 1808
(c) 1809
(d) 1810
(e) None of these
Answer: (d) 1810
(xiv) The book “Origin of Species” was written by:
(a) Linnaeus
(b) Lamarck
(c) Mendel
(d) Darwin
(e) None of these
Answer: (d) Darwin
(xv) The interaction between algae and fungi to form lichen is called:
(a) Parasitism
(b) Mutualism
(c) Commensalism
(d) Amensalism
(e) None of these
Answer: (b) Mutualism
(xvi) The actual location or place where an organism lives is called:
(a) Habitat
(b) Ecosystem
(c) Niche
(d) Biome
(e) None of these
Answer: (a) Habitat
(xvii) Which of the biomes has been increased in area by human activities?
(a) Savanna
(b) Grassland
(c) Desert
(d) Coniferous forest
(e) None of these
Answer: (b) Grassland
(xviii) Which zone of the lake ecosystem consists of phyto- and zooplankton?
(a) Littoral zone
(b) Limnetic zone
(c) Profundal zone
(d) Water deep layers
(e) None of these
Answer: (b) Limnetic zone
(xix) Which of the following is a biotic component of an ecosystem?
(a) Producers
(b) Consumers
(c) Decomposers
(d) All of these
(e) None of these
Answer: (d) All of these
(xx) A sequence of changes in the community structure of an ecosystem over a period of time is called:
(a) Natural selection
(b) Succession
(c) Neo-Darwinism
(d) Lamarckism
(e) None of these
Answer: (b) Succession