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Биология Exercises
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1. Complete the sentences with the verb in the correct form: Present Simple, Future Simple Tenses.

Watch tadpoles grow

16) If you look in a pond, you ..... (see) in a shallow water great lumps of jelly. That ..... (be) frog's spawn. Mother frog ..... (lay) up to 800 eggs. Don't think she ..... ( take) care of them. She ...... ( leave) them, floating on the surface to look after themselves as soon as the eggs are laid. Then in a few days if you look at an egg you ..... ( notice) a black spot, at first about the size of a pin-head, soon beginning to grow bigger and become shaped like a bean. Then you ..... ( begin) to recognise which is its head and which is its tail. It .... (wriggle) about in the jelly and free itself from it. For a few days the baby tadpole ..... ( han) about on the jelly. It ..... (need) no food at this time; it ..... (have) not even a mouth, yet. But you ..... ( see) soon how it begins to wriggle its tail. Let us look at it in three days. ..... it (change)? Yes, it ..... It ...... ( begin) to swim around and nibble at the plants. It ..... ( not feed) on jelly any more. The tadpoles ..... (grow) larger very quickly. At first they ..... ( have) feathery gills on the sides of their heads, but after three weeks the gills ..... (disappear). Their eyes ...... (grow) larger and their colour ..... ( become) lighter.

What ...... these signs (tell) you? They ...... ( tell) you that now, when they are about six weeks old, they ..... (need) a "meat" diet. When the tadpoles are ready for it they ..... ( come) close to tiny worms and nibble at them. Soon you ..... ( see) a great change come over the tadpoles. First back legs, then front legs ..... (grow). They ..... (start) to come to the surface for air, because they ..... (breathe) now with lungs. The tails ..... (become) shorter and after ten to twelve weeks the tadpoles ..... (turn) into frogs.

Complete the sentences with the verb in the correct form: Future Simple, Future Continuous, Future Perfect Tenses.

1) We ………( study) ethology in the next semester.

2) In several million years Red Sea ………. (become) a new ocean.

3) Dumping of creosote into the river led to extinction of all species of fish. Our team ……….. (conduct) an intense study on reintroduction of different species of fish.

4) There’s an epidemic among insects this year so many chicks of insect eating birds ……. (die).

5) Tomorrow we ………( dissect) frog’s leg to study femoral nerves.

6) The next meeting ……...(be) on next Wednesday at 4 pm.

7) The robins have finished building the nest and now the female bird ……..(lay) eggs.

8) I …….. (write) the plan by the end of the week.

9) British oil company promised to stop the oil leakage by July. But by this time the catastrophe ………(cover) the entire Mexican bay.

10) The forest on the part of the slope has been burned down. The soil must be strengthened by the 15-th of this month because by then rains ……… (start) and it will be washed away.

11) We ………….. (monitor) the ecosystem of the swamp for three years by the end of this May.

12) The number of lemmings …………(increase) for two years after present decline.

13) Astronauts who will take off tomorrow ……….. (stay) on the space station for 4 months. During this time they ………….. (conduct) many experiments.

14) When the answer from the ministry comes I ……….. (dig) out the bones of dinosaurs in the Gobi desert.

15) Grizzly bears ………. (fish) on the rifts during salmon spawning period. They ………(eat) fish and spawn while they have the opportunity.


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