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Q.57 Which of the following statements are TRUE for the transposable elements?P. Barbara McClintock discovered the autonomous and non-autonomous transposable elements inMaizeQ. Variations in flower pigmentation in Antirhinum are due to […]

Q.56 Which of the following statements are TRUE for plant growth regulators?P. The release of cellulase and polygalacturonase into the cell wall is promoted by abscissic acidQ. The early biosynthetic steps […]

Q.55 Which one of the following drugs is obtained from the capsule of Papaver somniferum?(A) Papain (B) Codeine (C) Digoxin (D) Bromelain Codeine is the drug obtained from the capsule […]

Q.54 Which of the following best represents the flow of energy through an ecosystem?(A) Producers –> Primary consumers –>Secondary consumers(B) Sun –>Producers –>Secondary consumers –>Primary consumers(C) Sun –>Producers –>Primary consumers –>Secondary consumers(D) […]

Q.53 Carbon dioxide and other ‘greenhouse gases’ act by(A) destroying ozone in the stratosphere(B) trapping heat in the earth’s atmosphere(C) allowing more visible light to reach the earth’s surface(D) reducing the […]

Q.52 Which one of the following is a free-living photosynthetic nitrogen fixer?(A) Frankia (B) Clostridium (C) Rhodospirillum (D) Rhizobium Rhodospirillum is the free-living photosynthetic nitrogen fixer among the options. Question Breakdown […]

Q.51 Which one of the following performs normal C3 photosynthesis when water is available, butswitches to crassulacean acid metabolism (CAM) during salt or drought stress?(A) Mesembryanthemum crystallinum (B) Cynodon dactylon(C) Eleucine […]

Q.50 The number of nucleosomes present in a 30 nm solenoid structure of a chromatin is (A) 2 (B) 4 (C) 6 (D) 8 30 nm Solenoid Chromatin Nucleosomes Chromatin […]

Q.49 Cytoplasmic male sterility via the chloroplast genome can be induced by the expression of Pha A gene encoding (A) β-Ketothiolase (B) Acetoacetyl CoA carboxylase (C) Acetoacetyl CoA reductase (D) […]

Q.48 Parenchyma cells associated with sieve tube members are called (A) Albuminous cells (B) Companion cells (C) Bulliform cells (D) Subsidiary cells Parenchyma Cells Sieve Tube Members In plant anatomy, parenchyma […]