The Cycle of Seasons
What is a revolution and how many days is it?
A revolution is when the Earth rotates around the sun. It takes 365 days.
What is carbon dioxide?
It is a gas that us created when humans and animals breathe out. It is also known as CO2.
What is chlorophyll? Check the correct answer.
a) Food for plants
b) The sap in plants
c) A green pigment in plants
d) A sugar produced by plants
c) A green pigment in plants
Which of these phenomena cause the seasons and temperature variations throughout the year? Check all the correct answers.
a) The size of the sun
b) The Earth’s tilt
c) The sun’s revolution around the Earth
d) The Earth’s revolution around the sun
b) The Earth’s tilt
d) The Earth’s revolution around the sun
What does a tree need in order to perform photosynthesis? Check the correct answer.
a) Light and carbon dioxide (CO2)
b) Oxygen (O2) and carbon dioxide (CO2)
c) Carbon dioxide (CO2) and sugar
d) Light and oxygen (O2)
a) Light and carbon dioxide (CO2)
Name the 3 different plant pigments and their colours.
Chlorophyll: green
Carotenoids: yellow, orange, red
Flavonoids: blue, purple, sometimes red
Stand up and explain the Earth's revolution around the sun like I have in class.
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Which of the following statements is true? Check the correct answer.
a) When fall comes, trees start producing more chlorophyll.
b) In winter, trees rest and grow rapidly.
c) In spring, sap rises in trees, from the roots to the branches.
d) In summer, a small plug forms between leaves and branches
c) In spring, sap rises in trees, from the roots to the branches.
The function of chlorophyll is to absorb ________.
The function of chlorophyll is to absorb light.
Briefly describe the lengths of winter days and nights in the Northern Hemisphere.
The days are short, and the nights are long. There are fewer hours of sunshine per day than in summer.
Does photosynthesis take place only in the summer?
No, photosynthesis also takes place in the spring when new leaves reappear and in the fall when the leaves fall from the trees.
What effect do the pigments in flowers and fruit have?
The bright colours of flowers and fruit attract insects and animals. In this way, pollen can be spread to the other plants, and seeds can be returned to the soil, allowing plants to reproduce.
Write the following words in the correct spaces in the texts. Watch out: you don’t need all of the words.
• at an angle • carbon dioxide (CO2 ) • directly • longer • Northern Hemisphere • oxygen (O2) • photosynthesis • shorter • sugar • sun • tilted
In the summer, the ___________________ is at its maximum tilt toward the _______. The days are __________ than the nights. It is warmer than in winter because the sun's rays hit the Earth more _________.
In the summer, the Northern Hemisphere is at its maximum tilt toward the sun. The days are longer than the nights. It is warmer than in winter because the sun's rays hit the Earth more directly.
Write the following words in the correct spaces in the texts. Watch out: you don’t need all of the words.
• at an angle • carbon dioxide (CO2 ) • directly • longer • Northern Hemisphere • oxygen (O2) • photosynthesis • shorter • sugar • sun • tilted
Through the process of __________________, plants can produce their own food in the form of ________. The plants absorb _________, and they release ________.
Through the process of photosynthesis, plants can produce their own food in the form of sugar. The plants absorb carbon dioxide (CO2), and they release oxygen (O2).