CBSE

1. Which of the following plants are used as green manure in crop fields and in sandy soils?

Crotalaria juncea and Allagi comelorum

Calotropis procera and Phyllanthus niruri

Dichanthium annulatum and Azolla nilotica

Saccharum munja and Lantana camara

Question 1 of 25

2. The bacterium Bacillus thuringiensis is widely used in contemporary biology as a/an?

agent for production of dairy products

source of industrial enzyme

indicator of water pollution

insecticide

Question 2 of 25

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

acquired heritable changes

directed mutations

genetic recombination

random mutations

Question 3 of 25

4. Which one among the following chemicals is used for causing defoliation of forest trees?

2, 4-D

Phosphon-D

Malic hydrazine

Amo-1618

Question 4 of 25

5. What is agent orange?

A weedicide containing dioxin

Color used in fluorescent lamp

A hazardous chemical used in luminous paints

A biodegradable insecticide

Question 5 of 25

6. Which one of the following is not used as a bio pesticide?

Trichoderma harzianum

Nuclear Polyhedrons Virus (NPV)

Xanthomonas campestris

Bacillus thuringiensis

Question 6 of 25

7. The aquatic fern which is an excellent bio fertilizer is?

Azolla

Salvinia

Marcelia

Pteridium

Question 7 of 25

8. Which one of the following is being utilized as a source of bio-diesel in the Indian countryside?

Euphorbia

Polygamist

Sugarcane

Beet root

Question 8 of 25

9. Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

Black rust of wheat

Downy mildew of grapes

Bacterial leaf blight of rice

Loose smut of wheat

Question 9 of 25

10. Farmers have reported over 50% higher yields of rice by using which of the following bio fertilizer?

Azolla pinata

Mycorrhiza

Cyanobacteria

Legume-Rhizome symbiosis

Question 10 of 25

11. DDT is?

a biodegradable pollutant

a non-degradable pollutant

an antibiotic

not a pollutant

Question 11 of 25

12. One of the major difficulties in the biological control of insect pests is the?

the predator develops a preference to other diets and may itself become a pest

predator does not always survive when transferred to a new environment

method is less effective as compared with the use of insecticides

practical difficulty of introducing the predator to specific areas

Question 12 of 25

13. Gobar gas contains mainly?

CO 2 + SO 2

CH 4 + CO 2

CO 2 + H 2

CH 4 + O 2

Question 13 of 25

14. A bio fertilizer is?

A cyanobacterium like Anabaena sp.living in cavities of Azolla leaves

green manure in which a quickly growing crop is cultivated and ploughes under

symbiotic bacteria like Azotobacter which fix atmospheric nitrogen

farm yard manure consisting of mixture of cattle dung and crop

Question 14 of 25

15. Which of the following pesticides is an acetylcholinesterase inhibitor?

Malathion

Endosulfan

Y-BHC

Aldrin

Question 15 of 25

16. What is true about Bt toxin?

The inactive protoxin gets converted into active form in the insect gut

Bt protein exists as active toxin in the Bacillus

The concerned Bacillus has antitoxins

The activated toxin enters the ovaries of the pest to sterilize it and thus prevent its multiplication

Question 16 of 25

17. Bacillus thuringiensis (Bt) strains have been used for designing novel?

bio insecticidal plants

bio mineralization processes

bio fertilizers

bio metallurgical techniques

Question 17 of 25

18. Which one of the following statement is correct?

Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil

At present it is not possible to grow maize without chemical fertilizers

Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants

Question 18 of 25

19. A free-living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is?

Anabaena

Nostoc

Chlorella

Tolypothrix

Question 19 of 25

20. The rotenone is?

an insect hormone

a natural herbicide

a bio herbicide

a natural insecticide

Question 20 of 25

21. Suppression of reproduction of one type of organism by utilizing some features of its Biology or Physiology to destroy it or by use of another organism is known as?

physiological control

biological control

competition

predation

Question 21 of 25

22. Which bacteria is utilized in gobar gas plant?

Nitrifying bacteria

Denitrifying bacteria

Ammonifying bacteria

Methanogens

Question 22 of 25

23. Biological control component is central to advanced agricultural production. Which of the following is used as a third generation pesticide?

Insect hormone analogues

Pheromones

Pathogens

Insect repellents

Question 23 of 25

24. During anaerobic digestion of organic waste such as in producing bio gas which one of the following is left under graded?

Hemicellulose

Lignin

Lipids

Cellulose

Question 24 of 25

25. Which of the following is non-symbiotic bio fertilizer?

Rhizobium

VAM

Azotobacter

Anabaena

Question 25 of 25

Test Name	Biofertilizers and Biopesticides Test
Subject	CBSE Biology
Test Type	MCQs
Total Question	25
Total Marks	50
Total Time	20 Minutes
Test Help For	CBSE Biology. CBSE Board Exams. Entrance Exams. Admissions Test. Jobs Test. General Knowledge. All Grades Exams.

Test By Subject	CBSE
Test By Topics	Biofertilizers and Biopesticides

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