1-Hayvonlarni muhofaza qilish

21. Hayotni belgilab beruvchi omillar majmui nimalardan iborat?

1)harorat;2)suv; 3)relef; 4)tuproq; 5)mineral tuzlar; 6)yorug`lik.

A. 2, 3, 4; B. 1, 5, 6; C. 1, 2, 6; D. 3, 5, 6.

22. Yuqori haroratga chidamli o’simliklar qanday nomlanadi?

A) Termofitlar

B) Termofil

C) geliofitlar

23. Tabiiy (1) va sun’iy (2) omillarni guruhlang. a)shamol; b)tuproq; v)mineral о‘g‘it; g)stanok ovozi; d)plastik buyum; e)о‘simlik.

A. 1. a, v, d 2. b, ye, g

B. 1.a, b, ye 2. v, g, d

C. 1. b, ye, g 2. a, v, d

D. 1. v, g, d 2. a, b, ye

24. Sо‘nggi 35-40 yil mobaynida Orol dengizi necha metrga pasaydi (1), uning akvatoriyasi necha martadan ortiq qisqardi (2), suv hajmi necha marta kamaydi (3), suvning shо‘rligi qanchaga yetdi (4).

A. 1. 15 m, 2. 2.5 marta. 3. 6 marta, 4. 60g/l.

B. 1. 21 m, 2. 3.5 marta, 3. 8 marta, 4. 70g/l.

C. 1. 10 m, 2. 2 marta, 3. 4 marta, 4. 50 g/l.

D. 1. 5 m, 2. 3 marta, 3. 5 marta, 4. 40 g/l.