CHAPTER 18

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What is a life cycle?
A sequence of stages in the growth and development of organisms from one generation to the next.
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What is the alternation of generations?
refers to alternating haploid and diploid states.
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What is a hermaphrodite?
An animal that can produce sperm and eggs.
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What is indirect development?
occurs in animals that produce large numbers of eggs. (aquatic animals and amphibians).
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What is direct development?
it's when embryos develop for several weeks inside the eggs, and hatch in an essentially adult form.
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What is in-vitro fertilisation?
This method involves fertilising eggs in a lab.
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What is contraception?
Preventing sperm and egg from meeting. (condoms, diaphragms and contraceptive pills are examples)
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What is self-fertilisation?
This happens when pollen is transferred to a stigma on the same plant.
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What is apomixis?
it's when the megaspore undergoes mitosis and develops as an embryo.
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What is metamorphosis?
An abrupt change in body structure.
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What is a placenta?
it's a specialised exchange organ found in most mammals.
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What is the substance in an egg that contains food for the embryo?
Yolk
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What is copulation?
Depositing sperm inside the female's reproductive tract.
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What is a type of sound wave that is too high in frequency for humans to hear?
Ultrasound
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The ability of plants to produce a completely new indiviudal from one cell is called
Totipotent
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What is the alternation of generations?

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refers to alternating haploid and diploid states.

Card 3

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What is a hermaphrodite?

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Card 4

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What is indirect development?

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What is direct development?

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