Default Title

Question (11)

QN008824

Nitrogen makes up approximately what percentage of Earth's atmosphere?

(A) 21%
(B) 50%
(C) 78%
(D) 90%

Correct Answer: C

Explanation:

Atmospheric nitrogen is about 78%.

Link:

Report Error

Question (12)

QN008825

Most living organisms cannot directly use atmospheric nitrogen because it is:

(A) Too hot
(B) Chemically inert
(C) Too heavy
(D) Radioactive

Correct Answer: B

Explanation:

Nitrogen gas is relatively unreactive.

Link:

Report Error

Question (13)

QN008826

The conversion of atmospheric nitrogen into usable compounds is called:

(A) Denitrification
(B) Nitrification
(C) Nitrogen fixation
(D) Ammonification

Correct Answer: C

Explanation:

Nitrogen fixation makes nitrogen available to organisms.

Link:

Report Error

Question (14)

QN008827

Which microorganism is commonly associated with nitrogen fixation in legume root nodules?

(A) Lactobacillus
(B) Rhizobium
(C) Amoeba
(D) Yeast

Correct Answer: B

Explanation:

Rhizobium lives symbiotically in legume roots.

Link:

Report Error

Question (15)

QN008828

In the nitrogen cycle, ammonia is converted into nitrites mainly by:

(A) Nitrosomonas
(B) Rhizobium
(C) Lactobacillus
(D) Penicillium

Correct Answer: A

Explanation:

Nitrosomonas carries out the first step of nitrification.

Link:

Report Error

Question (16)

QN008829

If 140 g of nitrogen gas (N₂) undergoes fixation, how many grams of nitrogen atoms does it contain?

(A) 28 g
(B) 70 g
(C) 140 g
(D) 280 g

Correct Answer: C

Explanation:

Nitrogen gas contains only nitrogen atoms.

Link:

Report Error

Question (17)

QN008830

Nitrates are absorbed by plants mainly through their:

(A) Leaves
(B) Flowers
(C) Roots
(D) Fruits

Correct Answer: C

Explanation:

Roots absorb nitrates dissolved in soil water.

Link:

Report Error

Question (18)

QN008831

Which process converts nitrates back into atmospheric nitrogen?

(A) Nitrogen fixation
(B) Denitrification
(C) Photosynthesis
(D) Respiration

Correct Answer: B

Explanation:

Denitrifying bacteria release nitrogen gas.

Link:

Report Error

Question (19)

QN008832

If a farmer adds excessive nitrogen fertiliser, the most likely environmental consequence is:

(A) Reduced plant growth
(B) Water pollution through runoff
(C) Reduced nitrogen cycle activity
(D) Increased oxygen in rivers

Correct Answer: B

Explanation:

Excess fertiliser may contaminate water bodies.

Link:

Report Error

Question (20)

QN008833

The process by which decomposers convert organic nitrogen into ammonia is called:

(A) Nitrification
(B) Denitrification
(C) Ammonification
(D) Fixation

Correct Answer: C

Explanation:

Organic nitrogen is converted into ammonia during ammonification.

Link:

Report Error

Question (11)

Nitrogen makes up approximately what percentage of Earth's atmosphere?

Explanation:

Link:

Question (12)

Most living organisms cannot directly use atmospheric nitrogen because it is:

Explanation:

Link:

Question (13)

The conversion of atmospheric nitrogen into usable compounds is called:

Explanation:

Link:

Question (14)

Which microorganism is commonly associated with nitrogen fixation in legume root nodules?

Explanation:

Link:

Question (15)

In the nitrogen cycle, ammonia is converted into nitrites mainly by:

Explanation:

Link:

Question (16)

If 140 g of nitrogen gas (N₂) undergoes fixation, how many grams of nitrogen atoms does it contain?

Explanation:

Link:

Question (17)

Nitrates are absorbed by plants mainly through their:

Explanation:

Link:

Question (18)

Which process converts nitrates back into atmospheric nitrogen?

Explanation:

Link:

Question (19)

If a farmer adds excessive nitrogen fertiliser, the most likely environmental consequence is:

Explanation:

Link:

Question (20)

The process by which decomposers convert organic nitrogen into ammonia is called:

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY