Theory question 102
Photosynthesis and Plant Nutrition(a) Complete the table below by ticking (✓) the appropriate group to which each of the listed elements required by plants belongs.
Elements: Hydrogen, Copper, Magnesium, Zinc, Phosphorus, Manganese, Boron, Nitrogen, Carbon, Oxygen
Groups: Microelement | Macroelement
(b) State: (i) three differences between the dentition of a herbivore and a carnivore; (ii) four differences between the dentition of a human and a goat.
(c) What are milk teeth?
Show the model answer
(a) Macroelements: hydrogen, magnesium, phosphorus, nitrogen, carbon, oxygen. Microelements: copper, zinc, manganese, boron.
(b)(i) Any three — Herbivore: has a diastema / carnivore: no diastema; canines absent or reduced / long, pointed canines; no carnassial teeth / carnassial teeth present; molars with flat, ridged grinding surfaces / molars with sharp cusps; incisors absent in upper jaw (horny pad) / incisors in both jaws.
(ii) Any four — Human: incisors in both jaws / goat: no upper incisors (horny pad); canines present / no canines; no diastema / diastema present; molars and premolars with cusps / with ridges for grinding; dental formula i2/2 c1/1 pm2/2 m3/3 / i0/3 c0/1 pm3/3 m3/3; jaws move up and down / jaws move side to side.
(c) Milk teeth are the first (deciduous) set of teeth in young mammals, which fall out and are replaced by permanent teeth.
Use paired, ruled columns for the differences.