Life cycles of flowering plants, conifers, mosses and ferns

Grade 7 Science Worksheet

Circle the best answer.

1. 1.

   Bo's peach cycle reads: blossom is pollinated → sperm and egg join → ? → seed sprouts. What fills the blank?

   • The ovule becomes a seed; the ovary becomes the peach
   • The seed sprouts before the peach forms
   • The tree makes spores in its blossoms
   • The petals become the peach around the seed
2. 2.

   Esme's pine cycle reads: adult pine → ? → sperm and egg join in the ovule → seed forms on a cone scale. What fills the blank?

   • Bees carry pollen to a pine flower
   • Wind carries pollen to a seed cone
   • A seedling grows
   • Seeds form inside a fruit
3. 3.

   Kira reads about pine seeds. Where do they form?

   • Inside the pine's small flowers
   • On the scales of seed cones
   • Inside a fruit
   • In sori under the needles
4. 4.

   On a windy spring day, Luz flies a kite near pine trees. How does pine pollen reach a seed cone?

   • Birds carry it inside fruit
   • The wind carries it
   • It swims through rainwater
   • Bees carry it from flower to flower
5. 5.

   Milo's fern cycle reads: adult fern → spores form in sori → ? → sperm swims to an egg → young fern. What fills the blank?

   • A spore grows into a small heart-shaped plant
   • A spore grows straight into a full-size adult fern
   • Flowers open on the fronds
   • A seed sprouts into a seedling
6. 6.

   Noah's moss cycle reads: spore lands → thin threads grow → leafy moss → ? → stalk with a capsule grows. What fills the blank?

   • Sperm swims through water to an egg
   • A seed forms in a fruit
   • Sperm blows on a dry wind over to an egg cell
   • Wind carries pollen to a cone
7. 7.

   Pia's fern cycle reads: small heart-shaped plant → sperm swims to an egg → ? → adult fern. What fills the blank?

   • A young fern grows
   • Pollen cones open
   • A fruit ripens
   • A seed forms and falls
8. 8.

   Ren notices ferns and mosses grow thickest in damp, shady woods. Why do they need water to reproduce?

   • Their flowers need rain to open
   • Their sperm must swim to reach an egg
   • Their seeds need water to sprout
   • Wind carries their sperm more easily when damp
9. 9.

   Tala's moss patch dries out for a whole summer. What can't happen while it stays dry?

   • Wind can't carry its pollen to the eggs
   • Sperm can't swim to the eggs
   • Nothing changes, as moss needs no water
   • Its seeds can't fall
10. 10.

    Zee compares the steps in a fern's cycle. Which step needs a film of water?

    • Pollen blowing to a cone
    • Spores growing straight into new adult ferns on the soil
    • Sperm swimming to an egg on the small plant
    • Spores blowing away from the sori