CSS Botany Past Paper 2026 PDF

Federal Public Service Commission (FPSC)
Competitive Examination for Recruitment to BPS-17 Posts under the Federal Government

 Time Allowed: 3 Hours

 Maximum Marks: 100 Marks

 Paper: Botany 

 PART-I (Objective) 20 Marks 

Q.1. (i) Select the best option/answer and fill in the appropriate Box on the OMR Answer Sheet. (20×1=20) (ii) Answers given anywhere else, other than OMR Answer Sheet, will not be considered.

1. Self-pollination of plant with two heterozygous gene pairs on two different chromosome pairs produces the following kind of genotypes. (A) 16 (B) 4 (C) 9 (D) 8

2. If adenine in a sample is 40% then the thymine in the sample would be: (A) 60% (B) 40% (C) 20% (D) 50%

3. If TCA codon is present in DNA the corresponding anticodon will be: (A) UGU (B) AGU (C) UGT (D) AGT

4. TTC is codon for: (A) Proline (B) Leucine (C) Valine (D) Lysine

5. Ribosome of Eukaryotes contains two sub-units: (A) 40 S and 50 S (B) 70 S and 50 S (C) 60 S and 40 S (D) 50 S and 30 S

6. Gametophytic generation is dominant in: (A) Angiosperms (B) Bryophytes (C) Gymnosperms (D) Pteridophytes

7. Endosperm of seed contains: (A) Haploid chromosome number (B) Diploid chromosome number (C) Triploid chromosome number (D) Tetraploid chromosome number

8. Double fertilization is present in: (A) Bryophytes (B) Angiosperms (C) Gymnosperms (D) Pteridophytes

9. Which of the following hormone promote ripening of fruit? (A) Ethylene (B) Auxin (C) Gibberellin (D) None of these

10. Total number of DNA codons are: (A) 60 (B) 46 (C) 64 (D) 24

11. Extra-chromosomal circular DNA molecules present in bacteria are called: (A) Endosomes (B) Plasmids (C) Episomes (D) Nucleosomes

12. Which of the following cause dormancy in buds and seed? (A) Gibberellin (B) Cytokinin (C) Abscisic Acid (D) Ethylene

13. Which of the following crop can fix atmospheric nitrogen? (A) Beans (B) Cotton (C) Wheat (D) Rice

14. Mendel started work on pea plant in: (A) 1757 (B) 1857 (C) 1902 (D) 1880

15. Which of the following crop is naturally cross-pollinated? (A) Wheat (B) Rice (C) Barley (D) Maize

16. Companion cells are present in: (A) Bryophytes (B) Angiosperms (C) Pteridophytes (D) Gymnosperms

17. Which of the following algae are almost exclusively marine? (A) Brown Algae (B) Green Algae (C) Blue Green Algae (D) Desmids

18. Shape of chloroplast of spirogyra is: (A) Star shape (B) Girdle shape (C) Cup shape (D) Spiral band shape

19. The amino acid at the beginning of polypeptide chain in eukaryotes is: (A) Methionine (B) Phenylalanine (C) Glycine (D) Lysine

20. Which of the following fungus is called club fungus? (A) Ascomycetes (B) Deuteromycetes (C) Phycomycetes (D) Basidomycetes

 PART-2 (Subjective) 80 Marks 

Attempt ONLY FOUR Questions from PART-II. (20×4)

 PART-II 

Q. No. 2. Explain evidences in support of evolution from conventional and molecular biology. (20)

Q. No. 3. Discuss biological and economic importance of fungi. (20)

Q. No. 4. How would you prove that replication of DNA is semiconservative? (20)

Q. No. 5. Explain Mendel’s Law of Segregation and Law of Independent Assortment. Is law of Independent Assortment applicable to codominant genes and the genes present on the same chromosome? (20)

Q. No. 6. Explain structure and reproduction of Spirogyra. (20)

Q. No. 7. Explain molecular structure of cell membrane. (20)

Q. No. 8. Write short note on any FOUR of the following:- (5 each) a. Micro and megasporogenesis in angiosperms b. Ecosystem c. Plant hormones d. Air pollution e. Gymnosperms (20)