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Plant Reproduction, Gravity and Space (Gravity and Space (Planets (Earth…
Plant Reproduction, Gravity and Space
Plant Reproduction
Asexual
Pollination
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Cross-Pollination: When pollen from a flower pollinates the stigma of a flower on a different plant.
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Asexual reproduction needs only one parent, produces identical offspring, and involves no fusion of sex cells or fertilisation.
Sexual
Sexual reproduction needs two parents, produces offspring that share both parents' DNA, and involves fertilisation and the fusion of sex cells.
Fertilisation is when pollen lands on a stigma, and grow pollen tubes to allow pollen grains to travel down them and into the style to then go to the ovary. Once in the ovary, it breaks into the ovule and fuse with the nucleus of the egg cell to form a zygote. After this, the ovary forms into a fruit to protect the developing seed.
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Gravity and Space
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Seasons: Seasons occur due to the tilt of the Earth's axis. For example, when the northern hemisphere is facing towards the sun, it is Summer, and when it is facing away it is Winter.
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Solar System Models
Heliocentric: This was a model that showed that the Sun was at the centre of our solar system and that all planets orbited it. It was created by Nicolaus Copernicus in 1534
Geocentric: This was a model that showed that the Earth was at the centre of our solar system and that all planets (and the Sun) orbited it. It was created by Ptolemy in 140 CE.
Stars: A star is a spherical astronomical object made of hydrogen and helium that is held together by its own gravity. The closest star to Earth (and the only one in our solar system) is the Sun.
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