Class 10th Science Biology Experiment 10 Biofertilizers Solutions or Answer.
Aim : To study biofertilizers such as Azotobacter, Nostoc, Anabaena and Azolla.
Requirements : Specimens of Azolla and permanent slides of Azotobacter, Nostoc and Anabaena.
Procedure : Observe the specimens of Azolla and the permanent slides of remaining organisms.
(Note : Enter your observations and the uses of these organisms from the viewpoint of agriculture.)
Multiple Choice Questions
Choose the correct alternative and write its letter (A), (B), (C), (D) in the box :
1. Which of the following has the wormicidal properties?
(A) Azolla (B) Anabaena (C) Nostoc (D) Azotobacter
Answer: A
2. Which of the two show symbiotic relationship with each other?
(A) Nostoc and Anabaena (B) Nostoc and Azotobacter(C) Azolla and Anabaena (D) Azolla and Nostoc
Answer: C
3. Find the odd one out from the viewpoint of classification.
(A) Azolla (B) Anabaena (C) Nostoc (D) Azotobacter
Answer: A
4. Which of the following is autotrophic bacteria?
(A) Azolla (B) Anabaena (C) Nostoc (D) Azotobacter
Answer: A
5. Why these organisms are said to be important in agriculture?
(A) They do not cause pollution. (B) They increase the yield of the crops. (C) They are natural and biofertilizers. (D) All of the above.
Answer: D