2025/2026 SS2 First Term Examination on Biology

1. Which of the following features is not an adaptation of plants to aquatic habitat?

2. The distribution of organisms in a fresh water habitat like a stream or pond is determined by the following factors except

3. Which of the following factors is the main problem facing xerophytic plants?

4. What is the critical limiting factor for plants below the photic zone in an aquatic ecosystem?

5. Which of the following factors is not associated with aquatic habitat?

6. Terrestrial organisms which are capable of maintaining their body temperature constant within fairly close limits are referred to as

7. Which of the following methods of reproduction is common to Paramecium and Amoeba

8. Which of the following organisms lacks a reproductive organ?

Use the information on the stages involved in conjugation to answer questions 9 and 10 i. Transfer of one cell content into the adjacent cell ii. Formation of a conjugation tube iii. Secretion of thick wall to form a zygospore iv. Formation of a protuberance v. Germination of a filament

9. Which of the following organisms exhibits the stages listed above during conjugation?

10. Which of the following arrangements is the correct sequence of the process

11. When the zygote of an organism continues to grow, it produces new cells by

12. The most dominant vegetation in terrestrial habitats are the

13. Which of the following is an adaptation of forest species?

14. The most important adaptation of xerophytes is the ability of the protoplasm to

15. Which of the following pairs are fully adapted to terrestrial life?

16. A characteristic feature of tropical rainforest is that it

17. Which of the following features best describes the savannah?

18. 1. Desert 2. Rainforest 3. Southern Guinea Savannah 4. Northern Guinea Savannah A biome where there are many cacti and the small mammals undergo aestivation for long periods is

19. In earthworms, the clitellum plays a crucial role in reproduction by

20. Houseflies exhibit holometabolous development, which means

21. In snails, the function of spermatheca is

22. Amoeba reproduces asexually while Spirogyra can reproduce both sexually and asexually. Which conclusion can be drawn about adaptation?

23. Which feature distinguishes binary fission in Amoeba from mitosis in higher organisms?

24. Which of the following animals has an incomplete digestive tract?

25. Which of the following organs is primarily responsible for storing bile before it is released into the small intestine?

26. Which part of the alimentary canal is mainly responsible for the absorption of nutrients

27. The gizzard in an earthworm is a modification that helps in

28. Which of the following is a characteristic of an incomplete digestive tract?

29. Which of the following statements correctly describes the digestive system of a tapeworm?

30. In planaria,blood enters the digestive system through the mouth and is partly digested in the gastrovascular cavity. How are nutrients distributed to the rest of the body?

Section B (Answer All; All Spellings Must be Correct to Score)

1. In marine habitats, pressure increases with increase in —

2. A stagnant body of water which do not flow eg lake is referred to as —

3. — is an area of land with very low rainfall and high evaporation rate

4. The process of nuclear division is called —

5. In multiple fission in Amoeba he Amoeba will first form — before dividing.

6. Earthworm, though a hermaphrodite reproduces sexually by —

7. Fertilization in earthworm occurs in — secreted by the clitellum

8. The major difference between complete and incomplete alimentary tract is —

9. The fertilised eggs of a cockroach are enclosed in a capsule called —

10. The common bile duct together with the pancreatic duct joined to form — before opening into the duodenum

THEORY ANSWER N01 (COMPULSORY) AND ANY OTHER 2

1. An individual ate jollof rice with meat, extensively analyse the digestion and absorption of this food in the digestive system.

2a. Mention the adaptive features of two named marsh plants and animals. b. Enumerate 4 characteristics of a grassland c. Give 2 examples each of desert plants and animals and state their adaptive features. d. In a tabulat form, state 4 MAJOR differences between marine and freshwater habitats.

3. Explain in details the process of conjugation in Spirogyra.

4. Discuss sexual reproduction in Earthworm

5. State 3 differences between complete and incomplete alimentary tract b. Define binary fission in Amoeba II. Define multiple fission in Amoeba