(a) List four adaptive features of animals that climb rain forest trees.
(b) State five important uses of water to organisms in the tropical rain forest.
(c) Describe how temperature as an ecological factor can be measured
(d)(i) Name two scientists who have contributed to the study of evolution.
(ii) List five evidences to support the occurrence of evolution.
(a) Name three main parts of the human brain
(b) State the functions of the following:
(i) Cerebrum
(ii) Hypothalamus
(iii) Medulla Oblongata.
(c)(i) List three organs of a higher plant that can respond to stimulus
(ii) What is tactic movement?
(d) Explain the following terms, giving one example in each case:
(I) Phototaxis
(ii) Hydrotaxis
(iii) Chemotaxis.
(a) What is a cell?
(b) Describe the structure and state the function of each of the following:
(i) Nucleus
(ii) Mitochnodrion.
(c)(i) Make a labelled diagram 8 cm to 10 cm long of the Euglena.
(ii) List. three animal-like features and two plant-like features of Euglena.
(a)(i) What is respiration?
(ii) Name two types of respiration.
(iii) Write in words the equation representing the type of respiration that occurs in the muscle during strenuous exercise.
(b) Name two diseases that can affect the above mentioned system.
(c) Mention the structures used for gaseous exchange in the following organisms:
(i) Amoeba
(ii) Cockroach
(iii) White mangrove
(iv) Hibiscus.
(a) Describe the processes that occur from the time a pollen grain is deposited on the stigma of a flower to the . formation of a zygote.
(b) Explain the importance of the amniotic sac to the mammalian embryo.
(c) The following are the names of some common diseases; malaria, typhoid, amoeboid dysentry, tuberculosis, tetanus, leprosy, cholera, yellow fever, poliomyelitis, measles, common cold, small pox, influenza, chicken pox, whooping cough and trypanosomiasis. Use the format below to classify the diseases according to their causative organisms.
| Viral diseases | Bacteria diseases | Protozoa diseases |
(a) What is a balanced diet?
(b) (i) Name four classes of food other than proteins
(ii) Give one example of food substance for each class named
(c)(i) State three functions of proteins in humans.
(ii) Describe the appearance of a child with protein deficiency.
(d)(i) Name one organelle in a living cell that produces enzymes.
(ii) Mention two enzymes that act on proteins.
In natural selection, Darwin proposed that evolution occurred because of the following conditions except
- A. food and other needs are abundant
- B. there is a fierce competition among the offsprings
- C. That the weaker offsprings are eliminated
- D. That nature selects those that will survive to reproduce their kind
Which of the following is not a behavioural adaptation used by social animals?
- A. Cryptic
- B. Mimicry
- C. Flash
- D. Season
Sickle-cell anaemia has persisted in the human race due to
- A. lack of proper medical care for sicklers
- B. carriers being more resistant to malaria
- C. mosquito vectors
- D. wildlife intermediate hosts
In Mendel’s experiments, it was discovered that the skin of an African can be attributed to
- A. a blending of black and white genes
- B. recombination of genes
- C. loss of the epidermis
- D. mutation in the skin cells
In an experiment, a red-flowered plant was crossed with another red-flowered plant and the following results were obtained: 448 red flowers and 154 white flowers in the F1 generation.Which of the following represents the genotypes of the parents if R is for red gene and r for white gene?
- A. RR X Rr
- B. RR X rr
- C. rr x rr
- D. Rr x Rr
In an experiment, a red-flowered plant was crossed with another red-flowered plant and the following results were obtained: 448 red flowers and 154 white flowers in the F1 generation.
Which of the following represents the phenotypic ratio of the above genetic cross?
- A. 1:2:1
- B. 4:1
- C. 3:1
- D. 2:2
The organic molecule (s) present in the nucleus is/are
- A. DNA
- B. Protein, RNA andDNA
- C. RNA and ATP
- D. RNA
Which of following pairs of scientists discovered the Rhesus factor in human blood?
- A. Hooke and Lavine
- B. Darwin and Landsteiner
- C. Landsteiner and Lavine
- D. Hooke and Darwin
Which of the following is an example of discontinuous variation?
- A. the range in height of a pea plant from 30cm to 50cm
- B. Offspring, including the two male cats and three female cats
- C. the colour of pear plants grown in the dark
- D. the adult body weight ranging from 50 kg t0 95 kg
Legumes incorporate nitrogen gas into their proteins because
- A. of the presence of Azotobacter in their roots
- B. they possess root nodules containing Rhizobium
- C. they have a well developed root system
- D. they are autotrophic
Forest conservation includes the following except
- A. prevention of bush-fires
- B. extensive felling of forest trees
- C. replacing of harvested trees by planting seedlings
- D. selective exploitation of forest trees
Renewable resources are formed by
- A. animals that reproduce sexually
- B. organisms confined to forest reserves
- C. organisms that are constantly regenerating themselves
- D. plants and animals that can reproduce sexually
Viruses are pathogens of the following diseases except
- A. measles
- B. smallpox
- C. poliomyelitis
- D. tuberculosis
Rabbits cannot survive in an aquatic because they have
- A. fore-and hind-limbs
- B. no gills
- C. no fins
- D. no scales
Competition among individuals of a population increases the
- A. number of organisms
- B. survival of the fittest
- C. availability of nutrient supplied
- D. enlargement of the territory