'Diatomaceous earth' is formed by the cell walls of diatoms.
Diatoms are microscopic and float passively in water.
The walls of diatoms are easily destructible.
Diatoms are chief producers in the oceans.
A
Diatoms are microscopic and float passively in water.
B
Diatoms are chief producers in the oceans.
C
'Diatomaceous earth' is formed by the cell walls of diatoms.
D
The walls of diatoms are easily destructible.
Open in App
Solution
Verified by Toppr
Diatoms are unicellular algae (eukaryotes) placed under kingdom Protista and serve as main producers in oceans. The cell of diatoms is surrounded by the cell wall, deposited with silica, called as frustules which are composed of two overlapping halves (the epitheca and the hypotheca). Shells of diatoms are highly resistant to decomposition due to the presence of silica and are deposited in ocean beds leading to the formation of the diatomaceous earth. The gliding movement of floating diatoms is a passive process, facilitated by secretion of slimy material.
Therefore, the correct answer is option C.
Was this answer helpful?
0
Similar Questions
Q1
Which group of kingdom Protista is being described in the statements given below? (i) This group includes diatoms and golden algae. (ii) They are microscopic and float passively in water currents (plankton). (iii) Most of them are photosynthetic. (iv) They are responsible for diatomaceous earth.
View Solution
Q2
Diatoms are also called as 'pearls of ocean', why? What is diatomaceous earth?
View Solution
Q3
What is the nature of the cell wall in diatoms? What is diatomaceous earth? Mention any two economic uses of it. Name the group under diatoms belongs in Protista.
View Solution
Q4
Diatomaceous earth is used as heat insulator in boilers and steam pipes because the cell wall of diatom