Succession of plants

Q. In ecological succession, from pioneer to climax community, the biomass shall

1. decrease
2. increase and then decrease
3. no relation
4. increase continuously

Q. The amount of nutrients, such as carbon, nitrogen, phosphorous and calcium present in the soil at any given time is referred as:

1. Standing crop
2. Climax
3. Climax community
4. Standing state

Q. Starting from the pioneer species, trace the sequence that follows in an ecological succession on a bare rock, until climax community is reached in an ecosystem. Name this type of succession. [3 marks]

Q. The amphibious stage in hydrarch succession is ___.

1. Reed swamp stage
2. Forest stage
3. None of these
4. Phytoplankton stage

Q.

What is extinction?

Q. Which of the following seral stages of hydrarch succession is depicted in the image below?

1. Forest stage
2. Reed swamp stage
3. Shrub stage
4. Reed swamp stage

Q. Succession proceeds from:

1. Xeric $\to$ Mesic conditions
2. Hydric $\to$ Mesic conditions
3. Mesic $\to$ Xeric conditions
4. Both a and b are correct

Q. In a climax community

1. Size of individual is small
2. Food chain and food web is complex
3. Efficiency of energy use is low
4. Ecological niches are few generalised compared to adjoining communities

Q. In autogenic succession

1. Early and continued dominance of autotrophic organism takes place like green plants.
2. Early dominance of heterotrophs takes place such as bacteria, fungi and other animals.
3. Replacement of existing communities cause largely by any other extremal condition.
4. Starts with previously built up substrata with already existing matter.
5. Community itself modifies its own environment thus, causing its own replacement by new communities.

Q. The growth of terrestrial plants is supported in the woodland stage.

1. False
2. True

Q. The most likely reason for the development of resistance against pesticides in insect damaging a crop is

1. Genetic recombinations
2. Random mutations
3. Acquired heritable change
4. Directed mutations

Q. The correct sequence of plants in a hydrosere is

1. 
2. 
3. 
4. 

Q. The correct sequence of plants in a hydrosere is

1. 
2. 
3. 
4. 

Q. In autogenic succession

1. Community itself modifies its own environment, thus causing its own replacement by new commuity
2. Replacement of existing communites due to external conditions
3. Early dominance of heterotrophs
4. Early and continued dominance of autotrophic organisms

Q. State whether the following statements are true or false.
Succession leads to the formation of a more or less stable community

1. True
2. False

Q. Select the correct statement regarding xerosere

1. It is the ecological succession on bare rocks that are water deficient but rich in organic matter
2. Crustose lichens such as Parmelia and Dermatocarpon are the pioneer community in xerosere
3. Hypnum and Tortula constitute the annual grass stage of xerosere
4. Zizyphus and Capparis constitute shrub stage of xerosere

Q.

Which of the following is the order of succession in a hydrosere?

I. Rooted aquatic plants-> phytoplankton->Free floating stage->Reed swamp stage-> Climax forest-> wood land stage-> Sedge Meadow stage

II. Rooted aquatic plants-> wood land stage->Rooted floating stage-> Sedge Meadow stage-> Reed swamp stage-> phytoplankton-> Climax forest

III. Phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage-> wood land stage-> Sedge Meadow stage-> Climax forest

Iv. Phytoplankton->Rooted aquatic plants->Rooted floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest.

1. I and IV
2. Only IV
3. III and II
4. Only III

Q. Choose the most appropriate explanation for ecological succession

1. The successive links in a food chain from plants to herbivores to carnivores.
2. The synchronous ageing of a cohort of animals born at the same time.
3. The successive colonization of a site by certain species accompanied by the extinction of others.
4. The replacement of closely related species at successive altitudes up a mountain.

Q. The amphibious stage in hydrarch succession is ___.

1. Phytoplankton stage
2. Forest stage
3. Reed swamp stage
4. None of these

Q. Savannah is found commonly in ___________.

1. U.S.S.R.
2. U.S.A.
3. Australia
4. India

Q. The growth of terrestrial plants is supported in the woodland stage.

1. True
2. False

Q. The amphibious stage in hydrarch succession is ___.

1. Phytoplankton stage
2. Forest stage
3. Reed swamp stage
4. None of these

Q. Study of periodical changes in plants in relation to season is called as

1. Physiognomy
2. Phycology
3. Photoperiodism
4. Phenology

Q. The correct sequence of plants in a hydrosere is

1. 
2. 
3. 
4. 

Q. Suppose Euphorbia and Maize are grown in the tropical area. Which one of the them do you think will be able to survive under such conditions?

Q.

Which of the following is the order of succession in a hydrosere?

I. Rooted aquatic plants-> phytoplankton->Free floating stage->Reed swamp stage-> Climax forest-> wood land stage-> Sedge Meadow stage

II. Rooted aquatic plants-> wood land stage->Rooted floating stage-> Sedge Meadow stage-> Reed swamp stage-> phytoplankton-> Climax forest

III. Phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage-> wood land stage-> Sedge Meadow stage-> Climax forest

Iv. Phytoplankton->Rooted aquatic plants->Rooted floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest.

1. Only III

2. III and II

3. I and IV

4. Only IV

Q. The growth of terrestrial plants is supported in the woodland stage.

1. True
2. False

Q. Which of the following forests is known as the 'lungs of the planet earth'?

1. Taiga forest
2. Tundra forest
3. Rainforests of North East India
4. Amazon rainforest

Q. Choose the most appropriate explanation for ecological succession

1. The replacement of closely related species at successive altitudes up a mountain.
2. The successive colonization of a site by certain species accompanied by the extinction of others.
3. The synchronous ageing of a cohort of animals born at the same time.
4. The successive links in a food chain from plants to herbivores to carnivores.

Q. The growth of terrestrial plants is supported in the woodland stage.

1. False
2. True