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Q.55 In the history of photosynthetic research, the empirical reaction of photosynthesis was first proposed for green plants (equation 1), followed by another reaction for purple sulfur bacteria (equation 2), […]

Q.54 If an egg cell of a diploid plant species has 10 chromosomes, the expectednumber of chromosomes in a double trisomic somatic cell of this specieswould be _______________ (Answer in […]

Q.53 Which of the following molecular approaches can be used to generate completeknock–out of a target gene in plants?(A) Homologous recombination(B) CRISPR–Cas9(C) Antisense RNA technique(D) Activation tagging CRISPR-Cas9 is the […]

Q.52 Identify the correct statement(s) with respect to plant disease.(A) Hairy root disease in tobacco is caused by Agrobacterium tumefaciens(B) Loose smut of barley is caused by Ustilago nuda(C) Stem […]

Q.51 Which one of the following agents causes the necrotic ring spot disease in stonefruits?(A) Fungi(B) Bacteria(C) Virus(D) Nematodes The necrotic ring spot disease in stone fruits is caused by […]

Q.50 Which one of the following commercially important carbohydrates is naturallyproduced only by the members of the plant kingdom?(A) Cellulose(B) Pectin(C) Chitin(D) Starch Pectin is the correct answer. This commercially important […]

Q.49 Correctly match the carnivorous plants (Group I) with the organs (Group II) they modify to trap the prey. Group I Group II (P) Pitcher plant (Nepenthes) (1) Leaf (Q) […]

Q.48 Which one of the following mature cell types is live but usually lacks nucleus?(A) Phloem parenchyma(B) Phloem companion(C) Phloem sieve element(D) Phloem–pole pericycle The correct answer is (C) Phloem […]

Q.47 Correctly match the names of the plant taxonomists (Group I) with the titles of the books they authored (Group II). Group I Group II (P) John Hutchinson (1) Classification […]

Q.46 E. coli is grown exclusively in a medium containing 15NH4Cl as the sole nitrogen source. Subsequently, the cells were shifted to a medium containing 14NH4Cl. The molar ratio of […]