- Explain how an upright position is maintained in herbaceous plants
Explain how an upright position is maintained in herbaceous plants Plant cells have a cellulose cell wall; which is rigid; plants absorb water through osmosis and cells become turgid; which makes the tissues firm and erect; Collenchyma cells have thickened cell walls; to give strength; Xylem vessels have thick and lignified walls; that strengthen plants. […]
- Describe how xerophytes are adapted to living in their habitat
Describe how xerophytes are adapted to living in their habitat Have thick, fleshy (succulent) and green stems; that are modified for water storage and photosynthesis; stomata are reduced in number/located in cavities on the epidermis(sunken stomata) / located mainly on lower part of leaf surface/Exhibit reversed stomata rhythm to minimize transpiration; Some are deep rooted; […]
- Describe how a mammalian heart is adapted for its function
How mammalian heart is adapted for its function The heart has atrioventricular/tricuspid and bicuspid valves and semi-lunar valves which allow blood to flow in one direction/prevent backflow of blood; valves have non-elastic chordae tendonea/ tendons which prevent atrioventricular valves from turning inside out into auricles during ventricular systole; The heart has thick muscular walls which […]
- Name the causative agents of the following diseases in humans
i) Candidiasis Candida albicans ii) Cholera Vibris cholerae RELATED SEARCHES Post Views: 11
- Give the meaning of the term binomial nomenclature
- Give the difference between Darwinian and Larmackian theories of evolution
Give the difference between Darwinian and Larmackian theories of evolution Larmarcician Darwinian RELATED SEARCHES Post Views: 11
- What is meant by the terms test-cross?
A cross made between a (homozygous) recessive parent and a parent of unknown genotype (to determine whether the unknown genotype in homozygous or heterozygous for dorminant gene RELATED QUESTIONS Post Views: 26
- What is meant by the term allele?
Allele refers to alternative form of a gene which occupy the cell loci which control the same characteristic RELATED QUESTIONS Post Views: 29
- State the functions of ribosomes and Golgi apparatus
a) Ribosomes Protein synthesis b) Golgi apparatus Post Views: 46
- A set up that was used to investigate a certain process in plants as shown in the diagram below.
a) What process was being investigated? (Rate of) transpiration b) i) State two precautions that should be taken when setting up the experiment. Cut shoot under water Apply petroleum jelly to cork-glass/Bung-glass/Bung-shoot connection Open reservoir tap ii) Give a reason for each precaution stated in b(i) above. To ensure no air enters leafy shoot/xylem To […]
- State how the following structures of the skin are adapted to their functions;
State how the following structures of the skin are adapted to their functions; i) Malphigian layer has actively dividing cells that give rise to new epidermal cells Epidermal cells contain Melanin that protects /prevents the skin against ultraviolet rays/UV light ii) Sebaceous glands Secrete sebum, an antiseptic/water repellent substance/prevent drying/cracking of skin/makes skin supple Post […]
- A certain animal has no incisors, no canines, 6 premolars and 6 molars in its upper jaw. It has 6 incisors, 2 canines, 6 premolars and 6 molars on the lower jaw. Write its dental formula
b) State the likely mode of feeding for the animal Herbivorous c) Give a reason for your answer in (b) above Lack of canines/incisors on the on the lower jaw/presence of canines / Incisors on the lower jaw only Post Views: 22
- Explain continental drift as an evidence of evolution
Post Views: 11
- The diagram below shows the position of an image formed in a defective eye
a) Name the defect. Hypermetropia/long sightedness b) Explain how the defect named in (a) above can be corrected. Post Views: 22
- State the aspects of light that affect the rate of photosynthesis
Post Views: 12
- Give the differences in products of anaerobic respiration in plants and animals
Plant Animal Post Views: 13
