1. A drop of blood contains

2. The substance that makes up about 80% of cytoplasm

3. Upon the entry of carbon dioxide in the red blood cells, H+ionsare formed at a very rapid rate, and yet the blood does not turn acid because

4. Blood haemoglobin has high affinity for

5. Which of the following is not a correct combination?

6. Carbon dioxide entering the red blood corpuscles from the tissues is partially taken up by haemoglobin to form

7. Cleavage divisions differ from normal mitotic divisions in that:

8. Bacteria do not need sunlight to grow because

9. The mammal that lays eggs is

10. The basic unit of all living organisms is

11. Endospermic seeds are found in

12. Ependymal cells lining the cavity of brain and spinal cord constitute

13. Fruiting body of mushrooms is present in

14. Human blood contains _____________ percentage of plasma.

15. The process of copying genetic information from one strand of DNA in to RNA is termed as

16. Which is regarded as a link between the living and the non-living?

17. Which of the following vertebrates are without teeth?
1. Jawless fishes
2. Turtles and tortoises
3. Toads
4. Birds
Codes:

18. Neurospora is used as genetic material because

19. Gene is

20. .Fish respire through their

21. Which of the following characteristics distinguish man from other animals?
1. His capacity to adapt to the needs of the environment
2. His curiosity
3. His blood groups
4. His DNA
Select the correct answer from the following:

22. Consider the following statements:
1. Even when a nerve cell is not conducting an impulse, it is actively transporting K+ and Na+ ions in and out respectively against their concentration gradients at the expense of energy
2. As a consequence of the operation of the Na- K pump, there is a concentration gradient for Na+ and K+ ions.
3. As a result, K+ diffuse out of the cell, and Na+ ions into the cell.
4. Eventually, there is difference in charge on either said of the membrane, positive inside and negative outside.
Which of the above statements is/are untrue?

23. The power house of energy in cells is

24. The RNA molecules from a single strand of ribonucleotides of

25. Human urine as compared to human blood is