MCQs Botany-40 Posted on October 27, 2025December 3, 2025Author agropublishers 0 MCQs Botany-40 1. During photosynthesis, energy is converted from ___ energy into ___ energy, stored in the bonds of glucose Light; Chemical Mechanical; Light Kinetic; Chemical Chemical; Chemical 2. The central dogma of molecular biology describes the flow of genetic information as________ RNA → DNA → Protein Protein → DNA → RNA DNA → RNA → Protein DNA → Protein → RNA 3. What term describes a large, naturally occurring community of plants and animals that occupy a specific habitat, such as a forest, desert, or ocean? Ecosystem Biome Niche Habitat 4. What is the defining characteristic of imprinted genes? They are permanently inactivated in all cells of the body Their expression is determined by their parental origin, leading to monoallelic expression They code for the enzymatic machinery involved in epigenetic silencing They have an exceptionally high rate of spontaneous mutation 5. Which of the following nitrogenous bases is NOT found in DNA? Uracil Thymine Guanine Adenine 6. Oxygen generally composed of _______ of biomolecules in living organisms 35% 40% 18% 65% 7. Roots are absent in _________ Gymnosperms Pteridophytes Angiosperms Bryophytes 8. Non-coding RNAs, such as microRNAs (miRNAs), can be considered part of epigenetic regulation because they___________ Code for histone proteins Regulate gene expression at the post-transcriptional level without altering the DNA sequence Are the primary components of chromatin Directly repair DNA damage 9. The regulation of the Calvin Cycle involves several key mechanisms. The light-activated enzyme Ferredoxin-Thioredoxin System (Fd-Trx system) reduces disulfide bridges on target enzymes. Which of the following enzymes is NOT activated by this reduction? Fructose-1,6-bisphosphatase (FBPase) Phosphoribulokinase (PRK) Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) Sedoheptulose-1,7-bisphosphatase (SBPase) 10. In plants true roots first evolved among _________ Bryophytes Angiosperms Pteridophytes Gymnosperms Loading … Question 1 of 10
