Aastaring veekogus
1. Milline on keskmine vee temperatuur:
kevadel .................................
suvel .........................................
sügisel ja talvel .............................
2. Milliseid aastaaegu kirjeldavad joonised?
Miks elutsevad kalad suvel ja talvel erinevates veekihtides?
 ...................................................... |
 ....................................................... |
3. Millise temperatuuri juures on vesi kõige tihedam ja raskem? ............................
Miks lakkab vee ringlemine veekogus sellel temperatuuril?
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
4. Miks enamik veekogusid ei jäätu põhjani?
.......................................................................................................................................
.......................................................................................................................................
5. Miks kogunevad kalad talvel jääaukude lähedusse?
.........................................................................................................................................
.........................................................................................................................................
6. Millised loomad viibivad veekogudes aasta ringi?
.......................................................................................................................................
.......................................................................................................................................
Millised veekogude kallastel elavatest olenditest rändavad talveks soojematele aladele?
.......................................................................................................................................
.......................................................................................................................................
7. Millised loomad jäävad talvel puhkeolekusse?
Mis iseloomustab puhkeolekus olevaid loomi?
.......................................................................................................................................
.......................................................................................................................................
Millised elusolendid elavad talve üle munade või nukkudena?
.......................................................................................................................................
.......................................................................................................................................
8. Millised veekogudes elavad loomad varuvad endale talveks toitu?
.......................................................................................................................................
.......................................................................................................................................
9.Kirjelda kõrkja elutsükklit veekogus ühe aasta jooksul!
talvel ...........................................................................................................................
kevadel ......................................................................................................................
suvel ...........................................................................................................................
talvel ..........................................................................................................................