BT101 Final Term Current Solved Questions 212 and MCQs 26

MUHAMMAD IMRAN BT101 - Ecology, Biodiversity & Evolution-I CURRENT QUESTIONS SOLVED FINAL TERM SEPTEMBER 2020 QUESTIONS 212 / MCQs 26

1. The external factors which control the ecosystem are _ of internal factors. _______________Independent
2. Fungi is ____ decomposer……………………………………………………………… _____________________________________Primary
3. The orientation toward a factor is called ____...............................................______________________. Taxis
4. When a population reach a ____ there are more individual trying to use the same quantity of resources…………………………………………………………………………………….______________________________________high density
5. Complexity of ecosystem make it more_____.................................................. ______________________Stable
6. Camouflage use of any combination of……………………………………………............____________________ Colouration
7. Near the surface of earth ozone concentration about ___ ppm……………………_____________________0.04-0.15
8. The total average height of troposphere is _____km……………………………………_________________________13Km
9. Adult human body contain _____ of water…………………………………………………...____________________________60%
10. What is the example of chemotrophs……………………………………………………………_____________________Microbes
11. The rate that new organic matter by means of individual growth and reproduction in all herbivores………………………………………………………………………………………. _____________________Gross productivity.
12. Variety of tools to track size of population in one tool………..______________________Survivorship curve
13. 541 million years ago O2 made stable of atmosphere……………………._________________________________ 13%
14. Region with identical climate have fauna and flora according to Buffon’s law…_____________Different
15. Natural selection variation from a population by favoring one allele over other at a gene

locus…__________________________________________________________________________________________.Odd

16. First vertebrates possess amitotic eggs………………………………………………………….________________________.Reptile
17. Toxoplasmosis caused by toxoplasma virulent in immune suppressed individually…____________AIDS
18. Rate at new organic matter formed in all herbivores………..._______________secondary productivity.
19. Example of winter sleep………………………………………………………………………….__________________________________bear
20. Speciation occur in single population………………………………………………………_________________________sympatric
21. Animal changes its color rapidly……………………………………………………………..__________________________chameleon
22. Above thermosphere is………………………………………………………………………….._____________________________exosphere
23. Symbiosis relationship between………………………………………………………. ______________________different species
24. bird voice box…………………………………………………………………………………….______________________________________syrinx
25. Extinct hippopotamus like………………………………………………………………………._____________________________taxodon
26. sense organs widely dispersed in………………………………………………………________________________________Annelida

1-Ozone depleting substances? 2 marks (65ppt)

Ozone depleting substances are chemicals that destroy the earth’s protective ozone layer. They include:

1. Halocarbon refrigerants · 2. Solvents · 3. Propellants in aerosols · 4. Chlorofluorocarbons · 5. Hydro chlorofluorocarbons · 6. Methyl bromide · 7. Carbon tetrachloride · 8. Methyl chloroform · 9. halon · 10. · hydrobromofluorocarbons (HBFCs) · 11. · methyl bromide (CH3Br) · 12. · bromochloromethane (CH2BrCl) · 2-What is lysosome? (120ppt)

A lysosome is a membrane-bound cell organelle that contains digestive enzymes. ... They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis

Lysosomes were discovered by the Belgian cytologist de Duve in the 1950s. Lysosomes are vesicles produced by the Golgi apparatus. Present in cytoplasm of eukaryotic cells. It contains degradative enzymes enclosed in a membrane.

Internal environment is acidic (pH: 7)

2 marks

3. Upper height and lower height of mesosphere (2)

The exact upper and lower boundaries of the mesosphere vary with latitude and with season (higher in winter and at the tropics, lower in summer and at the poles), but the lower boundary is usually located at altitudes from 50 to 65 kilometers (31 to 40 mi; 164,000 to 213,000 ft.) above the Earth's surface and the upper boundary (the mesopause) is usually around 85 to 100 kilometers (53 to 62 mi; 279,000 to 328,000 ft.).

4. Mesosphere boundaries and temperature. (2)

Layer, directly above the stratosphere and directly below the thermosphere Lower boundary is 50 to 65 kilometres Upper boundary is around 85 to 100 kilometres It is called as “near space”. Temperatures in the upper mesosphere fall as low as −101 °C varying according to latitude and season.

Mesopause

Boundary between the mesosphere and the thermosphere Height: 85 – 100 km Temperature: 100 – 102 °C

5. Height of stratosphere at equator and pol? (2)

The second major layer of Earth's atmosphere Above the troposphere, and below the mesosphere

Height

20 km (66,000 ft; 12 mi) at equator 10 km (33,000 ft; 6.2 mi) at midlatitudes 7 km (23,000 ft; 4.3 mi) at the poles

6. What is food Web (2)

The sun is the ultimate source of energy for life on Earth. Without it, nothing would be able to survive. As a result, living things have evolved special ways to harness the energy of the sun and use it for their own wellbeing. They have also developed special relationships and interactions that allow energy to be transferred. Once the energy has been captured, it gets passed around through the various organisms in a particular area. This transfer of energy is called a food web. series of organisms related by predator-prey and consumer-resource interactions; the entirety of interrelated food chains in an ecological community.

7. Phylum microsporidia (2)

Microsporidia are obligate intracellular spore-forming parasites that are fungi or closely related to them. Microsporidia used to be classified as protozoa.

Members of the phylum are commonly called microsporidia Small, obligatory intracellular parasites Several species that parasitize beneficial insects. Nosema bombicus parasitizes silkworms