The main function of the structure labelled 2 is to
- A. protect the inner parts of the seed
- B. nourish the embryo and the growing plant
- C. keep the inner parts moist
- D. maintain the shape if the seed
The structure labelled 1 is the
- A. plumule
- B. radicle
- C. cell membrane
- D. seed coat
Which of the labelled parts will develop into a new maize plant?
- A. 2
- B. 3
- C. 4
- D. 5
Sample of different soil types are packed in glass tubes whose lower ends are plugged with cotton wool, if these tubes are suspended in a trough of water, water will rise highest after a few hours in
- A. sand
- B. loamy
- C. clay
- D. humus
The following are methods of soil conservation EXCEPT
- A. contour terracing
- B. strip cropping
- C. contour ploughing
- D. mixed grazing
A larger percentage of tropical soils tends to be acidic because they
- A. contain large quantities of potash
- B. contain large quantities of lime
- C. lose a high proportion of their organic matter to running water
- D. lose lime and potash from the top soil through rain action
The swollen shoot disease of cocoa tree is caused by a
- A. virus
- B. fungus
- C. bacterium
- D. protozoan
In community, bacteria and fungi are referred to as
- A. producers
- B. decomposers
- C. scavengers
- D. consumers
Which of the following ecological factors are common to both terrestrial and aquatic habitats?
- A. Rainfall, temperature and light
- B. Salinity, rainfall and altitude
- C. Tides, wind, rainfall and altitude
- D. pH, salinity, rainfall and humidity.
Which of these disease CANNOT be prevented by immunization?
- A. Poliomyelitis
- B. Tuberculosis
- C. Cholera
- D. onchocerciasis
In an agricultural ecosystem, the biotic component consists of
- A. crop, pest and beneficial insects
- B. crops, temperature and humidity
- C. pests, beneficial insects and water
- D. crops, water and soil
In an ecosystem, animals which feed directly on plants are called
- A. secondary consumers
- B. primary consumers
- C. producers
- D. predators
An instrument that can be used to demonstrate phototropism and geotropism in plants is the
- A. auxanometer
- B. potometer
- C. klinostat
- D. photometer
The hormones which regulates the amount of glucose in the blood is called
- A. adrenalin
- B. auxin
- C. insulin
- D. thyroxine
Which of the following is an example of discontinuous variation?
- A. skin colouration
- B. left handedness
- C. body weight
- D. Height
If a woman who is a carrier of sickle cell trait (AS) married a man who is a sickler (SS) and they had four children, how many of them would be normal?
- A. Three
- B. Two
- C. One
- D. None
Gestation in mammals is the period
- A. required for growth after birth
- B. between the formation of the foetus and birth
- C. of development from zygote to birth
- D. before the formation of the zygote
Nastic movement is
- A. response to light stimulus
- B. non-directional
- C. directional
- D. response to internal stimulus
Two main distinguishing features of the cervical vertebra are the presence of
- A. short neural spine and vertebraterial canal
- B. prozygapophysis and cervical ribs
- C. large centrum and cervical ribs
- D. vertebraterial canal and large centrum
In the mammalian skin, melanin and keratin are contained in the
- A. sebaceous gland
- B. sweat gland
- C. subcubaneous layer
- D. malpighian layer