IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Organsims-Energy transfer and cycles
Topic :Organisms– Weightage : 21 %
All Questions for Topic : Habitat,Ecosystem,Inter dependency,Unity and diversity in life forms,Energy transfer and cycles,Classification
Question
Outline how plants and animals are connected in the carbon cycle. (3 marks)
▶️Answer/Explanation
Ans:
First two marks any two responses from the list:
• animals eat plants
• animals produce \(\mathrm{CO}_2\)(during respiration)
• plants use\(\mathrm{CO}_2\) (for photosynthesis)
• \(\mathrm{CO}_2\) is produced when animals or plants decay
Third mark connecting animals and plants in the carbon cycle:
linking carbon from animals to plants
or
correctly linking photosynthesis with respiration
or
CO2 produced when animals decay is used by plants
Question
In preparation for an ecology field trip, a class had been learning about what nutrients a plant needs for growth and photosynthesis. The students learned that one of the nutrients that plants need is nitrogen. Nitrogen for plants can come from many sources including fertilizers, lightning, and bacteria.
Before the trip the students conducted a laboratory experiment using fertilizer containing nitrogen to grow pea plants. The students’ hypothesis was:
If fertilizer containing nitrogen is added to the soil, then the pea plants will grow taller because there is more nitrogen which is an essential nutrient.
The students collected the following data after the plants had been growing for two weeks:
▶️Answer/Explanation
Ans:
Presence of fertilizer
Question
The students also used the following image to compare the leaves of the plants.
Using the information in the tables, state the independent variable.
Amount of nitrogen in the fertilizer.
State one dependent variable recorded by the students.
Height of Plants in millimetres
▶️Answer/Explanation
Ans:
Height or colour of leaves or leaf appearance