biology - Pest and Pest Control, Techniques in Agriculture

May 20th, 2015
Studypool Tutor
Price: $10 USD

Tutor description

In the 17th and 18th centuries the first systematic attempts were made to study and control pests. Before this time, handpicking and spraying were the usual methods of pest control. In the 19th century, poisons of various types were developed for use in sprays, and biological

Word Count: 6697
Showing Page: 1/49
BiologyWelcome to the GCSE Biology revision section. Click on the links below to see resources for Cell Activity, Genetics and DNA, Green Plants as Organisms, Humans as Organisms, Living Things in their Environment and Polymerisation of Amino Acids. These resources are constantly being added to. Cell ActivityPlant Cells vs. Animal CellsBoth types of cell have these: - Nucleus - Cytoplasm - Cell membrane - Mitochondria (Energy is released here by respiration) Only plant cells have these: - Cell wall - Large vacuole - Chloroplasts Specialised CellsRoot hair cell in Plants: It is adapted to do its job of taking in water and nutrients by having: - a large surface area - a thin cell membrane The Sperm cell is an example of a specialised animal cell:Red Blood Cell - Carries oxygen around the body Adaptations: No nucleus, large surface area, so maximum area for oxygen carriers: haemoglobin White Blood Cell Fight disease, some make antibodies Adaptations - Irregular shape, they can change shape to squeeze out of blood vessels and get to the site of infection. Others have cytoplasm which can flow making it possible for the cell to change shape, surround and engulf bacteria. Can increase in numbers to fight disease. Cells, Tissues, Organs and SystemsAll living things are made up of Cells A group ofCells e.g. Heart Muscle makes up a Tissue e.g. Heart Muscle Tissue A group of Tissues makes up an Organ e.g. HeartA group of Organsmakes up a System

Review from student

Studypool Student
" awesome work thanks "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1830 tutors are online

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors