Chapter 13 – Organisms And Populations

Autecology is the:

• a.Relation of heterogenous populations to its environment
• b.Relation of an individual to its environment
• c.Relation of a community to its environment
• d.Relation of a biome to its environment

Ecotone is:

• a.A polluted area
• b.The bottom of a lake
• c.A zone of transition between two communities
• d.A zone of developing community

Biosphere is:

• a.a component in the ecosystem
• b.composed of the plants present in the soil
• c.life in the outer space
• d.composed of all living organisms present on earth which interact with the physical environment

Ecological niche is:

• a.the surface area of the ocean
• b.an ecologically adapted zone
• c.the physical position and functional role of a species within the community
• d.formed of all plants and animals living at the bottom of a lake O NIT II: UNIT II: SSTRUCTURAL RGANISMS AND POPULATIONS TRUCTURAL O ORGANISATION IN P RGANISATION IN PLANTS ANDA LANTS AND ANIMAL NIMALS 89

According to Allen’s Rule, the mammals from colder climates have:

• a.shorter ears and longer limbs
• b.longer ears and shorter limbs
• c.longer ears and longer limbs
• d.shorter ears and shorter limbs

Salt concentration (Salinity) of the sea measured in parts per thousand is:

• a.10 – 15
• b.30 – 70
• c.0 –5
• d.30 – 35

Formation of tropical forests needs mean annual temperature and mean annual precipitation as:

• a.18 – 25°C and 150 – 400 cm
• b.5 – 15°C and 50 – 100 cm
• c.30 – 50°C and 100 – 150 cm
• d.5 – 15°C and 100 – 200 cm

Which of the following forest plants controls the light conditions at the ground?

• a.Lianas and climbers
• b.Shrubs
• c.Tall trees
• d.Herbs

What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park?

• a.It will grow normally
• b.It will grow well because it is planted in the same locality
• c.It may not survive because of change in its micro climate
• d.It grows very well because the plant gets more sunlight

If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the growth rate of population?

• a.50 per hour
• b.200 per hour
• c.5 per hour
• d.100 per hour

What would be the per cent growth or birth rate per individual per hour for the same population mentioned in the previous question (Question 10)?

• a.100
• b.200
• c.50
• d.150

A population has more young individuals compared to the older individuals. What would be the status of the population after some years?

• a.It will decline
• b.It will stabilise
• c.It will increase
• d.It will first decline and then stabilise

What parameters are used for tiger census in our country’s national parks and sanctuaries?

• a.Pug marks only
• b.Pug marks and faecal pellets
• c.Faecal pellets only
• d.Actual head counts

Which of the following would necessarily decrease the density of a population in a given habitat?

• a.Natality > mortality
• b.Immigration > emigration
• c.Mortality and emigration
• d.Natality and immigration

A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

• a.128
• b.24
• c.64
• d.32

In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:

• a.25 millions
• b.17 millions
• c.20 millions
• d.18 millions O NIT II: UNIT II: SSTRUCTURAL RGANISMS AND POPULATIONS TRUCTURAL O ORGANISATION IN P RGANISATION IN PLANTS ANDA LANTS AND ANIMAL NIMALS 91

Amensalism is an association between two species where:

• a.one species is harmed and other is benefitted
• b.one species is harmed and other is unaffected
• c.one species is benefitted and other is unaffected
• d.both the species are harmed.

Lichens are association of:

• a.bacteria and fungus
• b.alga and bacterium
• c.fungus and alga
• d.fungus and virus

Which of the following is a partial root parasite?

• a.Sandal wood
• b.Mistletoe
• c.Orobanche
• d.Ganoderma

Which one of the following organisms reproduces sexually only once in its life time?

• a.Banana
• b.Mango
• c.Tomato
• d.Eucalyptus