Solved MCQs for Botany.

For CSS/PMS

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

(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

(ii) In mitochondrial electron transport chains, the final c acceptor is:
(a) H2O 
(b) H2O2 
(c) NAD+
(d) FAD 
(e) None of these

(iii) The movement of water from cell to cell via plasmadesmata is called:
(a) Symplastic 
(b) Transmembrane 
(c) Apoplastic
(d) Facilitated 
(e) None of these

(iv) In maize plant, the CO2 fixation mechanism is called:
(a) C3 pathway 
(b) C4 pathway 
(c) CAM pathway
(d) C3 – C4 intermediate 
(e) None of these

(v) Salt-loving plants are known as:
(a) Glycophytes 
(b) Halophytes 
(c) Xerophytes
(d) Mesophytes 
(e) None of these

(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

(vii) The conversion of pyruvate into acetyl C0. A is called:
(a) Glycolysis 
(b) Fermentation 
(c) Oxidative carboxylation
(d) B-Oxidation 
(e) None of these

(viii) Between adenine and thymine, there are:
(a) Two hydrogen bonds
(b) 3 hydrogen bonds 
(c) One hydrogen bond
(d) 4 hydrogen bonds 
(e) None of these

(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

(x) The site of chromosome on which a gene is located is called:
(a) Allele 
(b) Locus 
(c) Site
(d) Trait 
(e) None of these

(xi) In a dihybrid cross, the ratio of F2 generation is:
(a) 9:3:3:1 
(b) 3:1 
(c) 1:2:1
(d) 1:1 
(e) None of these

(xii) When a single gene has multiple effects, the phenomenon is called:
(a) Codominance 
(b) Epistasis 
(c) Pleiotropy
(d) Genostasis 
(e) None of these

(xiii) Lamarck’s theory of evolution was published in:
(a) 1807 
(b) 1808 
(c) 1809
(d) 1810 
(e) None of these

(xiv) The book “Origin of Species” was written by:
(a) Linnaeus 
(b) Lamarck 
(c) Mendel
(d) Darwin 
(e) None of these

(xv) The interaction between algae and fungi to form lichen is called:
(a) Parasitism 
(b) Mutalism 
(c) Commensalism
(d) Amensalism 
(e) None of these

(xvi) The actual location or place where an organism lives is called:
(a) Habitat 
(b) Ecosystem 
(c) Niche
(d) Biome 
(e) None of these

(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

(xviii) Which zone of the lake ecosystem consists of phyto-and zoo-planktons?
(a) Littoral zone 
(b) Limnetic zone 
(c) Profundal zone
(d) Water deep layers 
(e) None of these

(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

(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 thes