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National 5 Biology > UNIT 2: (2.3) Reproduction > Flashcards

UNIT 2: (2.3) Reproduction Flashcards

1
Q

what is fertilisation?

A

the fusion of the nuclei of two haploid gametes (n) to produce a diploid zygote (2n) which then repeatedly divides by mitosis to form an embryo

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2
Q

what are all the structures in a plant? (8)

A
  • anther
  • stigma
  • style
  • ovary
  • ovule
  • nectary
  • petal
  • sepal
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3
Q

what is the function of the anther?

A

male part that produces pollen grains (male gamete)

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4
Q

what is the function of the stigma?

A

where pollen grains land in pollenation

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5
Q

what is the function of the style?

A

female part connecting stigma to the ovary

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6
Q

what is the function of the ovary in plants?

A

female part that produces and stores ovules( female gamete)

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7
Q

what is the function of the ovule?

A

contains the female gamete

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8
Q

what is the function of the nectary?

A

makes nectar to attract insects

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9
Q

what is the function of the petal?

A

brightly coloured to attract insects

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10
Q

what is the function of the sepal?

A

protects the bud before flowering

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11
Q

what is pollination?

A

process by which pollen grains are transferred from the anther to the stigma

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12
Q

how does fertilisation happen in plants?

A
  • pollen grain lands on stigma a pollen tube grows down to the ovary
  • male gamete leaves the pollen grain and travels down the pollen tube into the ovary
  • the fuses with the nucleus of the female gamete (ovule) in fertilisation
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13
Q

what structural features of an egg cell allow it to perform its function?

A
  • has a store of food in cytoplasm

- larger than sperm for nucleus

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14
Q

what are all the structures of the male reproductive system?

A
  • testis
  • sperm tube
  • penis
  • urethra
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15
Q

what is the function of the testis?

A

where sperm cells are produced

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16
Q

what is the function of the sperm tube?

A

carries sperm out of the testis

17
Q

what is the function of the penis?

A

deposits sperm inside female vagina in sexual intercourse

18
Q

what is the function of the urethra?

A

tube through the penis that carries both urine and sperm out of the body

19
Q

what are all the structures of the female reproductive system?

A
  • oviduct
  • ovary
  • uterus
  • vagina
20
Q

what is the function of the oviduct?

A

tube that connects ovary to uterus and the site of fertilisation

21
Q

what is the function of the ovary in humans?

A

where egg (or ova) are produced and stored

22
Q

what is the function of the uterus?

A

where the fertilised egg (zygote) develops into an embryo then fetus

23
Q

what is the function of the vagina?

A

where sperm is deposited in sexual intercourse

24
Q

how many chromosomes does a zygote have?

A

46

diploid

25
Q

how does a zygote become an embryo?

A

zygote divides repeatedly by mitosis to form an embryo

National 5 Biology (20 decks)

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