1 which species had the least efficient use of P? a. green algae b. blue-green a
ID: 262845 • Letter: 1
Question
1 which species had the least efficient use of P?
a. green algae
b. blue-green algae
c. diatoms
d. none
q2 which species likely reproduced fastest?
a. green algae
b. blue-green algae
c. red algae
d. filamentous algae
q3. which species of algae was the best competitor in the absence of mortality?
a. green algae
b. blue-green algae
c. diatoms
d. cyanobacteria
q4 which best explains why that specie did so well
a. it was bigger
b. it ate other species
c. it is more efficient in using nitrogen
d. it is more efficient in using phosphorus
q5. what nutrient primarly limited growth of cyanobacteria
a. nitrogen
b. phosphorus
c.silica
Explanation / Answer
1. Phosphorus is an essential nutrient required for the growth of all organisms. In plants, phosphorus is important in photosynthesis, respiration, storage of energy, cell division, etc.
Algae and diatoms (a type of phytoplankton) need nutrients for growth and reproduction. The main nutrients they require include phosphorus, nitrogen, iron, and some trace elements. It has been observed that algae and phyoplanktons grow well in water body rich in phosphorus.
Hence, green algae and diatoms use phosphorus efficiently for their growth.
Therefore, options (a) and (c) are incorrect.
Blue green algae or cyanobacteria are prokaryotes that obtain energy through photosynthesis. High phosphorus levels in water bodies can lead to blue-green algal blooms. Hence, they are able to utilize the nutrients phosphorus efficiently in order to grow and multiply.
Hence, option (b) is incorrect.
Therefore, from all the given options none of the species has the least sufficient use of phosphorus.
So, the correct answer is option (d).
2. Algae undergoes vegetative, asexual, or sexual reproduction. Vegetative reproduction mainly occurs through fragmentation. Formation of spores and binary fission are the methods of asexual reproduction and sexual reproduction occurs through the fusion of gametes.
Green algae, red algae, and filamentous algae are eukaryotic species and hence form complex structures. Their mode of reproduction too differ and may range from simple to complex.
Hence, among the four we cannot say these species are able to reproduce fastest.
So, options (a), (c), and (d) are incorrect.
Blue green algae (cyanobacteria ) are prokaryotic organisms which reproduce asexually by binary or multiple fission or may undergo fragmentation or spore formation too in some cases. They exhibit faster mode of reproduction compared to others owing to their simpler structure.
Hence, among the given options, blue-green algae reproduce the fastest.
Therefore, the correct answer is option (b).
3. Competitive ability depends on several factors like availability of nutrients, sunlight, temperature, etc. The algal species compete for these elements in order to grow and flourish.
Among all the species, green algae can be the best competitor in the absence of mortality since they are able to survive at high carbon dioxide level, limited light, and varied temperature and compete well for available nitrogen.
Therefore, the correct answer is option (a).
4. Green algae are able to survive well compared to other species due to the fact that they are able to use nitrogen more efficiently.
Hence, the correct answer is option (c).
5. Nutrients play an important role in the growth and reproduction of plants.
The growth limiting factor for cyanobacteria is silica which influence the potential succession by these species. Silicate deposition can lead to decomposition of cyanobacterial species. Low silicon level can increase the growth of cyanobacteria.
Therefore, the correct answer is option (c).
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