required practicals
Cards (4)
- describe the Investigation for phototropism
- using three identical plants
- place plant A in a box that has a slit in it where light goes in it from one direction
- place plant B in a similar box but on a clinostat, which rotates the plant to different parts can be exposed to the light
- place plant C in a box of darkness
- Plant A grows towards the light due to positive phototropism
- plant B grows upwards due to the even light exposure to all of the plants
- plant C grows upwards as plants in the dark still grow trying to look for light
- describe the investigation for gravitropism
- Set up two petri dishes with 3 mustard seeds and allow them to germinate
- Place one dish on a clinostat and the other to a support on its side
- Record the direction of growth of both the shoots and the roots for each seed
- Add some damp cotton wool to two petri dishes
- Place 3 bean seedlings in the cotton wool in each petri dish, A facing down, B horizontally and C facing upwards
- Cover each dish with a lid
- Attach one petri dish to a support so that it’s on its side
- Attach the second petri dish to a clinostat
- Place both in a light-proof box leave for two days and then observe growth of the seedlings
- what were the results of gravitropism?
- first petri dish all roots have grown downwards (positive gravitropic response) regardless of which way they were initially facing and all shoots have grown upwards (negative gravitropic response)
- second petri dish, all roots and all shoots have all grown straight outwards in whichever direction they were placed
- as the effect of gravity has been cancelled out by the revolving of the clinostat
- quadrat practical
- use two tape measures to layout a survey area in your habitat
- use a random number generator to create set of coordinates to place your quadrat
- count the number of plants in quadrat
- record in a table and repeat 9 more times
- estimate the population of plants using
- total area/area sampled