1. Chitin is a major component of the cell walls of

2. Which of the following blood vessels carries oxygen-rich blood from the lungs to the heart

3. The primary structure responsible for pumping blood for circulation through the mammalian circulatory systems is the...

4. A heterogeneous tongue roller (Tt) married a non-tongue roller (tt), The phenotype ratio of the offspring is

5. The name of a strong acid found in the human stomach is

6. In the Kidney of mammals, the site of ultra-filtration is the

7. The production of violet colouration, when dilute NaOH solution is added to a solution of food substance, followed by drops of 1%$CUSO_4$, solution; while shaking a purple or violet colouration indicates the presence of

8. Which of these actions is not a reflex action

9. One of the following is the first organ that develops in a fetus during organogenesis

10. Which of the following is not a function of the blood?

11. The locomotory structure of Amoeba is the

12. Which of the following is an example of genetic variation?

13. The complete cardiac cycle of one heartbeat is

14. Lime water turns milky in the presence of

15. The association between shark and remora fish is

16. Which of the following cells play a role in the body defense

17. In Nigeria, the Guinea savanna belt borders the

18. Plants of temperate origin can be growing tropical areas in the vegetation zones of the ___

19. The scientist who postulated the theory of use and disuse is

20. Which of the following cells produces antibodies in the human body

21. The organ which is sensitive to light in Euglena is the __

22. The generic name of vitamin D is also known as

23. Which of the following serves a protective role

24. The correct sequence of biomes from northern to Southern Nigeria is

25. Metabolic production of urea is carried out in the

26. The rods and cones in the retina of an eye are examples of

27. How many true ribs are present in the human body

28. The low levels of oxygen in the body tissues is called.

29. If the pair of alleles for baldness is given as Bb, a female carrier will be denoted by

30. The hepatic portal vein is unique because it

31. The organ that excretes excess food and water in euglena and paramecium is

32. In both. plants, and; animals, which of the following, cell organelles is responsible for maintaining water balance and removal of waste materials

33. The mineral required for the formation of RBC in animals is

34. Which of the following is likely to have a higher concentration of mitochondria?

35. Paternity, disputes can most accurately be resolved |through the use of

36. The level of organisation of Amoeba and Euglena is

37. The main excretory product of earth-worm is

38. A man of AS genotype marries a woman of AS genotype, what is the probability of having a sickle cell anemia offspring?

39. An arthropod that is destructive at early stage of its life cycle is ____

40. An individual with blood group AB can receive blood from those in group(s) __