Match these items. 1. protons plus neutrons atomic mass 2. proton number neutron 3. detects radiation atomic number 4. fixed shape solid 5. neutral charge atom 6. positive charge geiger counter 7. occupies the whole container electron 8. measures intensity of radiation gas 9. smallest particle to retain characteristics proton 10. negative charge photographic film

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

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measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.