Poor growth and yellowing of leaves in plants is due to deficiency of
- A. boron
- B. calcium
- C. copper
- D. iron
- E. phosphorus
Which of these is NOT a structural adaptation of desert plants for water conservation?
- A. Broad leaves with many stomata
- B. Leaves reduced into spines
- C. Scale leaves
- D. Stems and leaves with thick cuticle
- E. Sunken stomata
The following are ways of caring for the mammalian skin EXCEPT
- A. eating balanced diet
- B. exposing the skin to adequate sunlight
- C. using skin toning creams
- D. using moisturising creams to prevent drying
- E. washing the skin with clean water and soap
Which of the following is NOT a function of placenta in mammals?
- A. absorption of food
- B. gaseous exchange
- C. removal of wastes
- D. secretion of hormones
- E. secretion of enzymes.
Which of the following does NOT occur during photosynthesis?
- A. Carbon dioxide is evolved
- B. Energy from the sun is utilized
- C. Glucose is synthesized
- D. Oxygen is given off
- E. Split of water
Tsetse-fly is a vector of a disease known as
- A. cholera
- B. dysentery
- C. elephantiasis
- D. malaria
- E. trypanosomiasis
All these statements are correct about a vein EXCEPT that it
- A. carries blood to the heart
- B. contains blood at low pressure
- C. has no valve
- D. possesses fairly thick walls
- E. usually carries deoxygenated blood
The speed of wind can be measured with an instrument called
- A. anemometer
- B. barometer
- C. hygrometer
- D. photometer
- E. thermometer
ln the process of succession, a climax community is established when
- A. a stable community is achieved
- B. the colonizers accommodate the new corners
- C. the colonizers are wiped out
- D. the first inhabitants settle down
- E. the new corners dominate the original inhabitants
Which of the following is a nitrifying bacterium?
- A. Azotobacter
- B. Clostridium
- C. Nitrobacter
- D. Rhizobium
- E. Staphylococcus
Which of these is a direct photosynthetic product?
- A. fats
- B. glucose
- C. latex
- D. protein
- E. starch
Deficiency of calcium in a child’s diet causes
- A. cretinism
- B. goiter
- C. kwashiorkor
- D. rickets
- E. scurvy
A waterlogged habitat with low light penetration and very low quantity of dissolved oxygen best describes a/an habitat
- A. estuarine
- B. marine
- C. sahel savanna
- D. swampy
- E. tropical rainforest
Birds excrete nitrogenous wastes in form of
- A. ammonia
- B. sweat
- C. urea
- D. uric acid
- E. urine
The process which reduces the nitrogen content of the soil is
- A. ammonification
- B. denitrification
- C. nitrogen fixation
- D. nitrification
- E. putrefaction
Dry, horny scales in reptiles help them to
- A. carryout gaseous exchange
- B. escape from predator
- C. facilitate movement
- D. look for mating partners
- E. prevent water loss.
Which of these statements best defines pyramid of energy?
- A. energy flow from one tropic level to another
- B. energy flow from one habitat to another
- C. the amount of energy in a given area
- D. the loss of energy from one organism to another
- E. the rate of energy flow in an area
Autotrophs include all the following EXCEPT
- A. chemosynthetic bacteria
- B. diatoms
- C. green plants
- D. phytoplankton
- E. zooplankton
An example of a carnivorous plant is
- A. cassytha
- B. lichen
- C. mucor
- D. mushroom
- E. sundew
The number of chromosomes in a gamete is represented by
- A. n
- B. 2n
- C. 4n
- D. 23n
- E. 46n
Which of the following is NOT a type of exoskeleton?
- A. Cartilage
- B. Chitin
- C. Hoot
- D. Nail
- E. Shell