In a saprophyte, sex organs are produced in the
- A. Gamotrophyte
- B. Rhizoid
- C. Protonema
- D. Sporopyte
In a reflex action, impulse flows from
- A. 1 to 2
- B. 2 to 1
- C. 4 to 1
- D. 4 to 2
All the cell bodies in the spinal cord are found in
- A. 1
- B. 2
- C. 3
- D. 4
If the blood is too concentrated, more water is absorbed from?
- A. 5
- B. 4
- C. 3
- D. 1
Free nitrogen is released to the atmosphere by
- A. Nitrogen-fixing bacteria
- B. nitrifying bacteria
- C. denitrifying bacteria
- D. saprophytic bacteria
What do bacteria in root nodules derive from the host plant?
- A. Protection and minerals
- B. Water and minerals
- C. Carbonhydrates and water
- D. Protection and carbohydrates
An acidic soil can be improved upon by
- A. sedimentation
- B. leaching
- C. flocculation
- D. watering
Which of the following constitute pollution?
- A. Droppings from birds
- B. loud disco sound
- C. A pack of cigarettes
- D. Refuse in an incinerator
Which set of disease is spread mainly by insect vectors?
- A. Cholera, tenia and gonorrhoea
- B. Poliomyelitis, tuberculosis and syphilis
- C. Cholera, malaria and tuberculosis
- D. Malaria, cholera and river blindness
Physiological adaptation to very dry condition in animals is called
- A. hibernation
- B. aestivation
- C. rejuvenation
- D. xeromorphism
The salinity of a brackish enviroment
- A. increases immediately after rain
- B. increase at the end of rainy season
- C. Decrease with increase in micro-organisms
- D. increase during dry season
which of the organisms will have the lowest population in an ecosystem?
- A. Hawk
- B. Cowpea
- C. Praying mantis
- D. Mouse
Which of the following is an omnivore?
- A. Praying mantis
- B. Hawk
- C. Mouse
- D. Grasshopper
In a savanna ecosystem the abiotic factors include
- A. legumes, temperature and sandy soil
- B. water, temperature and soil
- C. minerals, oxygen and reptiles
- D. water, soil and grasses
Haemophilia results from the mutation of the genes
- A. in the sex chromosome
- B. which control skin colour
- C. which control the mechanism for blood-clotting
- D. which control the formation of haemoglobin
An individual in the AB blood group is a universal recipient for blood donation because
- A. all the red blood cells do not carry antigen
- B. all the red blood cells carry antigen
- C. all the red blood cells carry antigen
- D. there are no anti-A and anti-B antibodies in the serum
What stage during cell division is represented in the figure above?
- A. Prophase
- B. Metaphase
- C. Anaphase
- D. Telophase
What will be the result of the first filial generation (F1) and the second filial generation (F2) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant?
- A. F1 flies all short-winged and F2 flies all normal-winged
- B. F1 flies all normal and F2 flies all short-winged
- C. F1 flies all short-winged and three-quarters of F2 flies are short-winged
- D. F1 flies all normal-winged and three-quarters of F2 flies are normal-winged
In organism where the 2nd number of chromosomes is 16, the number of chromosomes in each gamete will be
- A. 32
- B. 16
- C. 8
- D. 4
The part of the ear that is concerned with balance is the
- A. semi-circular canals
- B. incus
- C. malleus
- D. Eustachian tube