Previous Year Pattern — Biology Mix

Grade 10 Science — Previous Year Pattern — Biology Mix: 25 practice questions with instant scoring and explanations.

1. Which organism is a producer in the ecosystem?
2. The genotype of a carrier for a recessive trait is:
3. Which is an example of natural selection?
4. The main function of the mitochondrion is:
5. A monohybrid cross of Tt × tt produces offspring in ratio:
6. Which hormone is responsible for the development of secondary sexual characteristics in males?
7. The process by which plants respond to gravity is:
8. How many ATP molecules are produced from one glucose in anaerobic respiration?
9. The site of ribosomal RNA synthesis is:
10. In human reproduction, fertilization occurs in:
11. Which organelle is found in plant cells but not animal cells?
12. The DNA replication is described as:
13. Which is the first step of photosynthesis?
14. The phenotypic ratio in a dihybrid cross of AaBb × AaBb is:
15. Which is an example of a vestigial organ in humans?
16. The hormone that regulates calcium levels in blood is:
17. The number of nucleotides in a codon is:
18. Which part of the nervous system controls involuntary actions?
19. A dihybrid testcross produces offspring in ratio:
20. Which enzyme is not involved in digestion?
21. The endocrine gland that secretes thyroxine is:
22. Which is a haploid structure in plants?
23. The function of the contractile vacuole in protozoans is:
24. Which organisms are the primary decomposers in an ecosystem?
25. The replication of DNA occurs during: