Ecosystem

Vertical distribution of different species occupying different levels in dense vegetation is called

• stratification

• species composition

• standing crop

• trophic structure

Green plants convert sunlight energy into the energy of

• Ionic bond

• Hydrogen bond

• Chemical bond

• Hydrophobic bond

Name the term used to describe a single dominant species that dictates community structure

• Pioneer species

• Transitional species

• Key stone species

• Indigenous species

Consider the following statements.

i. A given species may occupy more than one trophic level in the same ecosystem at the same time.

ii. As succession proceeds, the numbers and types of animals and decomposers also changes.

iii. Secondary succession is faster than primary succession.

Mark the option depicting the correct answer regarding these statements where “T” stands for true and “F” stands for false.

• i-F, ii-T, iii-T

• i-T, ii-T, iii-T

• i-F, ii-F, iii-T

• i-T, ii-F, iii-F

Primary productivity depends on the

• Plant species inhabiting a particular area

• Availability of nutrients

• Photosynthetic capacity of plants

• All the above

Consider the following organisms.

i. Phytoplankton

ii. Lichens

iii. Mosses

iv. Marsh-meadow

Which of the following sets of organisms are observed during hydrarch succession?

• (i) and (ii) only

• (ii) and (iii) only

• (i) and (iv) only

• (i), (ii) and (iii) only

During the process of aerobic decomposition

• CO2 is consumed and O2 is released

• O2 is consumed and CO2 is released

• CO2 is consumed and HNO3 is released

• none of these

Read the given statements and select the correct option.

Statement 1 : Herbivores are also called as first order consumers.

Statement 2 : Herbivores obtain their food directly from plants.

• Both statements 1 and 2 are correct.

• Statement 1 is correct but statement 2 is incorrect.

• Statement 1 is incorrect but statement 2 is correct.

• Both statements 1 and 2 are incorrect

If 100 joules of energy is available at the producer level, then amount of energy present at the level of secondary consumers is

• 10 J

• 1J

• 0.1 J

• 0.01 J

Identify the possible link A in the following food chain

• Rabbit

• Deer

• Cobra

• Parrot