Describe how different environmental factors affect the direction of growth of roots and shoots.

The growth and roots and shoots is caused by the plant hormone auxin. Shoots grow towards light, known as phototropism, they also grow upwards against the force of gravity which is known as geotropism. In shoots auxin causes faster growth and therefore the unequal distribution of this hormone on the lower side of the shoot causes it to bend upwards towards light and away from gravity. Roots on the other hand grow downwards towards moisture (hydrotropism) and towards gravity (geotropism). This growth is also a result of the unequal distirbution of the hormone auxin, however in roots auxin inhibits growth. This in turn means that growth rates on the upper side of the root are faster, casuing it to bend, growing down towards moisture and towards the force of gravity.

AO
Answered by Andrew O. Biology tutor

2562 Views

See similar Biology GCSE tutors

Related Biology GCSE answers

All answers ▸

Explain how Auxin is used to cause phototropism in plants.


1a) Give 3 structures that an animal cell would contain and describe their function? 1b) Name 3 different structures that a plant cell contains which an animal cell would not.


Explain the differences between aerobic and anaerobic respiration (in animals), when the transition occurs and why there is a need for the body to remove lactic acid that is built up during the process?


Define osmosis


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences