BT101 Midterm Current Solved Papers

BT 101 Mid Current Solved

MCQS

1. Subset of the food-web (dynamic) is impacted by a change in population Number
2. Y-axis is a logarithmic plot of numbers of survivors X-axis is a linear plot of (age).
3. The first community to become established in an area is called the (pioneer community.)
4. Which animal change it color rapidly (chameleon)
5. Plant algae and cyanobacteria are (photo autotrophs)
6. Plants are (autotrophs)
7. 3 oxygen atom form (ozone.)
8. above thermosphere is (exosphere)
9. Second layer (stratosphere)
10. This process of evaporation through plant leaves is called (transpiration.)
11. (Exotic Species) are species that occur outside of their natural ranges because of human activity
12. Deforestation directly affects rate of (transpiration).
13. • Pere David’s deer was a native species of (China).
14. • mutualism is Long-term relationship between individuals of (different species)
15. • High population (densities) can lead to the accumulation of harmful waste products that kill individuals or Impair reproduction, reducing the population’s growth.
16. The maximum population (size) of the species that the environment can sustain indefinitely.
17. . . . Gross primary productivity Gap Raw rate at which the (primary producers) synthesize new organic matter.

Question and Answers

Define Commensalism?

One species gain benefits while those of the other species is neither benefited nor harmed. Example: Remora fish and Sharks

Types of Population Growth?

Exponential and Logistic Growth

Different form of energy in ecosystem?

When it comes to the flow of energy in ecosystems there are two types of organisms: producers and consumers. Plants are a common example of producers in all populations. They are able to convert carbon dioxide into oxygen and glucose, a common sugar consumed by most organisms.

Hibernation?

Hibernation • Decreased metabolism • Lowered body temperature • May last for weeks or months • Examples: Rodents, Shrews

Formation of inorganic plant and algal nutrition?

• Chemicals such as nitrogen and phosphorus that stimulate the growth of plants and algae – Harmful in large concentrations

Different type of autotrophs?

Photoautotrophs. Photoautotrophs are organisms who get the energy to make organic materials from sunlight. ... Chemoautotrophs. ... Plants. ... Green Algae

How pollution could be classified?

Pollution can be classified by its physical nature, by its source, by its recipient, by the sector affected or by its effects. Pollution may be in the form of a gas, liquid, solid or energy. ... There are different types of pollution: water pollution, air pollution, solid waste pollution and noise pollution.

Types of Biological clock?

Circadian rhythms: biological cycles that occur about every twenty-four hours. Sleep follows a circadian rhythm. ... In radian rhythms: biological cycles that take longer than twenty-four hours. ... Ultrafine rhythms: biological cycles that occur more than once a day.

Role of mine in ecosystem?

Mining operations often contaminate the soil with toxic heavy metals and acids. Acids can lower the pH of the soil, preventing plants and soil microorganisms from thriving, and can also react with various minerals in the soil that are required by plants, such as calcium and magnesium.

How to CO2 come from burning gasoline?

20% and 13 % of carbon dioxide emissions comes from the burning of gasoline in internal combustion engines of cars and trucks

Three properties of thermosphere?

• Temperature increase with altitude due to absorption of highly energetic solar radiation.
• Temperature can raise 1700 °C or more.
• Highly diluted gas in this layer can reach 2,500 °C during the day.

Exponential growth?

of change (that is, the derivative) of a quantity with respect to time is proportional to the quantity itself.

Population and Cause?

These are the leading causes:

Poverty. Poverty is believed to be the leading cause of overpopulation. ... Poor Contraceptive Use. ... Child Labor. ... Reduced Mortality Rates. ... Fertility Treatment. ... Immigration. ... Lack of Water. ... Lower Life Expectancy.

Overexploitation?

Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Continued overexploitation can lead to the destruction of the resource.

Heterotrophs?

A heterotroph is an organism that cannot manufacture its own food by carbon fixation and therefore derives its intake of nutrition from other sources of organic carbon, mainly plant or animal matter. In the food chain, heterotrophs are secondary and tertiary consumers.

Net primary productivity of wetland and Rainfall?

Net primary production (NPP) is highest in wetlands receiving nutrient enrichment or with high nutrient turnover. The degree, and periodicity of flooding affect

wetland

productivity

more than rainfall or temperature. Drainage can promote enhanced productivity by increasing nutrient mineralization.

Define parasitism?

One species gain benefits other species is harmed • Intimate contact (feed off host) • usually do not kill host (parasitoids do) • Enhances fitness of parasite but reduces fitness of host

What is trophic ozone?

Tropospheric ozone (O3) is another short-lived photochemical pollutant formed in the atmosphere during complex chemical reactions between motor vehicle and other emissions in combination with sunlight.

What are type of extinction Species and cause?

Humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. Explosive, unsustainable human population growth is an essential cause of the extinction crisis.

Carrying capacity (K)?

The maximum population size of the species that the environment can sustain indefinitely. • Environment's maximal load • Population size decreases above carrying capacity

Categories of water pollution?

Types of water pollution. There are many types of water pollution because water comes from many sources.

Nutrients Pollution. Some wastewater, fertilizers and sewage contain high levels of nutrients. ... Surface water pollution. ... Oxygen Depleting. ... Microbiological. ... Suspended Matter. ... Chemical Water Pollution. ... Oil Spillage.

Bio magnification?

Bio magnification, also known as bio amplification or biological magnification, is any concentration of a toxin, such as pesticides, in the tissues of tolerant organisms at successively higher levels in a food chain.

Flow of energy in ecosystem?

herbivores at the second trophic level, use the plants as food which gives them energy.

Decomposition process?

Decomposition is the process by which organic substances are broken down into simpler organic matter. The process is a part of the nutrient cycle and is essential for recycling the finite matter that occupies physical space in the biosphere. ... Animals, such as worms, also help decompose the organic materials.

Difference between Iodine and Koiondoint?

Food Web?

A food web (or food cycle) is the natural interconnection of food chains and a graphical representation (usually an image) of what-eats-what in an ecological community. Another name for food web is consumer-resource system.

Adaptation to avoid dehydration in animal?

Adaptations To avoid dehydration: - Behavioral Nocturnal mode, burrows/hides – Physiological Osmoregulation