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Class 9 Science — Reproduction: how life continues

Tell asexual reproduction from sexual, name the parts of a flower and follow pollen through to a seed, and describe fertilisation and the reproductive cycle in animals and humans.

Name: ________________________

Before you start

The parts of a flower, each one named.

123456
  1. 1. The green flap at the base — a sepal
  2. 2. The broad flap sweeping out to the side — a petal
  3. 3. The small sac on the end of the slender stalk — the anther of a stamen
  4. 4. The flattened cap on top of the central column — the stigma
  5. 5. The thin central column — the style
  6. 6. The rounded swelling at the base of the column — the ovary

Sepals and petals are the two outer whorls. The stamen is the male part and the pistil — stigma, style and ovary together — is the female one.

  1. 1.What is the one-word name for the transfer of pollen grains from a stamen to a stigma?

  2. 2.Tap the part of this flower that produces the pollen grains.

    Write the number of the part.

    123456

  3. 3.A frog lays thousands of eggs in a pond while a bird lays a handful in a nest. What does the chapter say about the two strategies?

    • a) Both fertilise internally, and the difference lies in nest-building
    • b) The frog's fertilisation is external and survival is low; the bird's is internal and survival is better
    • c) Survival is the same in both; the frog simply lays more
    • d) The frog's fertilisation is internal and the bird's external

  4. 4.How many parts does a complete flower have? Answer with a number.

  5. 5.A gardener grows twenty plants from cuttings of one rose bush. How do the new plants compare with the parent?

    • a) They vary from it, because cuttings mix genetic material from two parents
    • b) They are genetically identical to it, because one parent and mitosis were involved
    • c) They vary, because meiosis takes place when a cutting roots
    • d) They are identical to each other but different from the parent

  6. 6.After fertilisation, what does each ovule inside the ovary become? Give the one word.

  7. 7.Sort each case by the kind of reproduction it is.

    Groups: Asexual reproduction · Sexual reproduction

    • A gardener rooting a sugarcane stem cutting
    • A male gamete from a pollen grain fusing with an egg cell
    • A potato sprouting new plants from its underground stem
    • A Bryophyllum leaf sprouting tiny plantlets
    • A frog releasing eggs into water for a male to fertilise

  8. 8.What is a fertilised egg called? Give the one word.

Answer key — Class 9 Science — Reproduction: how life continues

  1. 1. pollination
  2. 2. 3 — The small sac on the end of the slender stalk
  3. 3. b) The frog's fertilisation is external and survival is low; the bird's is internal and survival is better
  4. 4. 4
  5. 5. b) They are genetically identical to it, because one parent and mitosis were involved
  6. 6. seed
  7. 7. A potato sprouting new plants from its underground stem → Asexual reproduction; A Bryophyllum leaf sprouting tiny plantlets → Asexual reproduction; A gardener rooting a sugarcane stem cutting → Asexual reproduction; A male gamete from a pollen grain fusing with an egg cell → Sexual reproduction; A frog releasing eggs into water for a male to fertilise → Sexual reproduction
  8. 8. zygote