ai What is a cell?
ii name three scientists that are associated with the discovery of the cell.
b. make a diagram, 6cm to 8cm long of a plant cell and label only the organelle responsible for cell production
name one blood cell in humans that does not have the oraganelle labelled in [b]i.
iii What is the biological implication of the cell named in (b)(i) not possessing the organelle responsible for
cell reproduction?
(c) List six organelles found in a plant celI.
Which of the following statements about sex linked traits is not correct?
- A. male inherit sex linked traits from thier fathers
- B. sex linked traits are more common in males
- C. females can be carriers beacuse they can be heterozygous for the trait
- D. males are never carriers since they only recieve one sex chromosome
Which of the following statements best describes a test cross?
- A. to determine the genotype of an individual whose phenotype is to be known
- B. to determine the phenotype of an individual whose genotype is known
- C. between the progeny of parents to ascertain external expressions
- D. between two homozygous recessive individuals to confirm the genotypes
Two tall plants were crossed and all the F1 plants were tall. when the F1 plants were selfed, some of the F2 plants were tall while others were short what are the possible genotypes of the original plants ?
- A. Tt and tt
- B. TT and TT
- C. tt and tt
- D. TT and Tt
Individuals belonging to the blood group O are universal donors because ?
- A. antigens are absent in thier blood cells
- B. members of the group consitutute the highest number of humans
- C. there are no of antibodies in thier blood plasma
- D. the antigens in thier blood cells are easily destroyed
Which of the followig traits in humans is an example of physiological variation?
- A. skin colour
- B. fingerprint
- C. toungue rolling
- D. height
An accident victim was successfully transfused with blood from the father whose blood, group is AB. The blood group of the accident victim is
- A. B
- B. O
- C. AB
- D. A
The use of a lighter instead of matchsticks is a way of conserving
- A. petroleum
- B. forest
- C. water
- D. wildlife
The burning of farmlands ahould be discouraged because?
- A. destroys organic components of the soil
- B. increases population of wild animals
- C. increases dormancy period of some seeds
- D. destroys some plant seeds
The conservation of natural resources is enhanced by the following practices except
- A. controlling farm activities
- B. protecting endangered species
- C. poaching in game reserves
- D. establishing parks and gardens
The biological association that contributes directly to succession in a community is
- A. competition
- B. predation
- C. parasitism
- D. commensialism
which of the following features is not an adaptation?
- A. Breathing roots for entry air
- B. flowers are raised above water to attract pollinators
- C. spongy tissues containing gases for boyancy
- D. hairy structures on the leaves to reduce water loss
Study the food chain illustrated below and use it to answer this question.
J-K-L-M-N
The position occupied by each of organisms J K L M N in the food chain is known as the
- A. energy level
- B. trophic level
- C. food web
- D. pyramid of numbers
Study the food chain illustrated below and use it to answer this question.
J-K-L-M-N
which of the following statements about organism L is correct?
- A. feeds on organism
- B. is a primary consumer
- C. is the producer
- D. is a secondary consumer
Study the food chain illustrated below and use it to answer this question.
J-K-L-M-N
Organism J is normally sustained by energy from?
- A. Green plants
- B. carbohydrates
- C. organism
- D. sunlight
which of the follwing pyramids is not used in ecology? pyramid of
- A. energy
- B. numbers
- C. biomass
- D. orgsnisms
The diagram below is an illustration of an experiment on sedimentation of soil, use it to answer this question.
The part labelled IV is
- A. silt
- B. sand
- C. humus
- D. clay
The diagram below is an illustration of an experiment on sedimentation of soil, use it to answer this question.
The organic component of the soil is labelled
- A. I
- B. II
- C. III
- D. IV
A group of organisms of the same species living in a particular place is known as
- A. colony
- B. ecosystem
- C. Niche
- D. population
which of the following practices will not maintain soil fertility?
- A. preventing soil erosion
- B. bush fallowing
- C. tendency of becoming waterlogged
- D. porosity and low water retention ability
The property of clayey soil that prevents it from supporting thick vegetation is its?
- A. composition of chemically weathered granite rocks
- B. inability to retain much water
- C. tendency of becoming waterlogged
- D. porosity and low water retention ability