Xerophytes Study guides, Revision notes & Summaries

Ecology Questions-Science Olympiad Questions and Answers Rated A+ What does P.O.P. stand for? Persistent organic pollutants. What are P.O.P.'s? Toxic substances formed from organic compounds. Besides mercury, what other heavy metals cause toxic pollution? Lead, Cadmium, and Chronium What are the main sources of mercury pollution? Gold mining and use of substances derived from mercury in industry and agriculture. What environmental damage is caused by mercury pollution? Mercury...

Ecology Questions-Science Olympiad Exam Questions With Verified Answers What does P.O.P. stand for? - answerPersistent organic pollutants. What are P.O.P.'s? - answerToxic substances formed from organic compounds. Besides mercury, what other heavy metals cause toxic pollution? - answerLead, Cadmium, and Chronium What are the main sources of mercury pollution? - answerGold mining and use of substances derived from mercury in industry and agriculture. What environmental damage is caused b...

AQA A-Level Biology - Topic 3 (2022/2023) with Verified Answers Smaller organisms have a ........... surface area to volume ratio Higher How do single called organisms exchange substances? Diffuse directly into or out of the cell across the cell surface membrane Give 2 reasons why in multicellular organisms, diffusion across outer membrane would be too slow? 1. Some cells deep within body- big distance between them and outside 2. Larger animals have low surface area to volume ratio- difficult ...

25.Chlorophyll containing autorophic thallophytes is called as (A) Algae (B) Lichens (C) Fungi (D) Bryophytes correct answers (A) (SSC (10+2) Level Data Entry Operator & LDC 2013) Exp: Autotrophs are those plants who make own food as carbohydrate in the presence of sunlight. Autotrophic thallophytes are algae which have chlorophyll contain for photosynthesis. 48. 'Table sugar' is which type of sugar? (A) Frutose (B) Galactose (C) Glucose (D) Sucrose correct answers (D) (SSC (10+2) Level Dat...

GEOG 101 Quiz 8 - Questions & Answers The boundary between middle latitude forest and middle latitude grassland is most closely related to the concept of the ________. Ecotone Which of the following are most abundant on Earth? Arthropods A type of species removal when vegetation is naturally replaced by another group is termed ________. Succession Except in the rainy tropics, virtually all needleleaf trees are ________. Evergreen The hardwood broadleaf deciduous trees around the world are _____...

AQA A Level Biology: Gas Exchange in Plants Graded A+ How are leaves well adapted for gas exchange? - air spaces allow carbon dioxide to diffuse - irregular spongy mesophyll layer increases the SA:V ratio - stomata allow gases to diffuse in and out How does the waxy cuticle help to reduce water loss? - Thick waxy cuticle means there is an impermeable layer which reduces evaporation from the surface. Its thickness also increases the distance for diffusion Compensation point Xerophy...

AQA A-Level Biology - Topic 3 All Answers Correct Smaller organisms have a ........... surface area to volume ratio How do single called organisms exchange substances? Higher Diffuse directly into or out of the cell across the cell surface membrane Give 2 reasons why in multicellular organisms, diffusion across outer membrane would be too slow? 1. Some cells deep within body- big distance between them and outside 2. Larger animals have low surface area to volume ratio- difficul...

AQA Biology A-Level: Exchange Rated A+ what affects the amount of material that is exchanged in an organism? higher metabolic rate= more materials exchanged size and metabolic rate- name 4 things that need to be exchanged between an organism and their environment. respiratory gases - nutrients - excretory products - heat how do you calculate the surface area to volume ratio? how does gas exchange occur in a single-celled organism? - they are small organisms so have a l...

Which statement is true? A. Human ancestors with more diverse diets were more likely to go extinct during times when environmental conditions change. B. The proposed hypothesis of variability selection states that the key events in human evolution were shaped by environmental instability and the flexibility of our ancestors in what they ate and where they lived. C. The savanna hypothesis states that Hominin speciation was driven by abrupt and fast climate fluctuations of wet-dry cycles....

In depth summary of Transport and Exchange Surfaces, designed for the CCEA A Level specification. Includes helpful diagrams. Happy studying!