B1g-h 0.0 / 5 ? BiologyPhotosynthesis and transpirationGCSEOCR Created by: notae003Created on: 17-05-15 00:05 Give 2 examples of plant hormones. Auxins and gibberellins. 1 of 16 What do plant hormones do? They control the growth of shoots, roots, flowers and the ripening of fruits. 2 of 16 What is a tropism? A directional growth response in plants. 3 of 16 What is a positive tropism? A plant growth towards a stimulus. 4 of 16 What is phototropism? A growth response to light. 5 of 16 What is geotropism? A growth response to gravity. 6 of 16 Where is the genetic information for a human found? In the nucleus. 7 of 16 How many pairs of chromosomes do we have? 23 pairs. 8 of 16 What are chromosomes made of? DNA. 9 of 16 What is a gene? A section of DNA which provides the instructions for one characteristic. 10 of 16 What is a mutation? A change in a gene or chromosome. 11 of 16 Give two examples of diseases that are caused by genetic mutations. Cystic fibrosis and sickle-cell anaemia. 12 of 16 What is an allele? Different versions of a gene. 13 of 16 What does homozygous mean? If we have two of the same allele (i.e. two dominant or two recessive). 14 of 16 What does heterozygous mean? If we have two different alleles (i.e. one dominant and one recessive). 15 of 16 Give three commercial uses of plant hormones. Selective weedkillers, controlling the ripening of fruit and controlling dormancy. 16 of 16
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