Assertion: Soil particles, particularly clay and organic matter in soil, contain negative charges that attract positively-charged ions such as Ca²⁺, K⁺ and Mg²⁺.

Reason: Essential elements derived from soil are termed as mineral elements while those derived from air or water are known as nonmineral elements.

• If both assertion and reason are true and reason is the correct explanation of assertion. 

• If both assertion and reason are true but reason is not the correct explanation of assertion. 

• If assertion is true but reason is false. 

• If both assertion and reason are false.

Which one of the following elements is almost non-essential for plants?

• Ca

• Mo

• Zn

• Na

Which of the following is a group of micronutrients for plants?

• Fe, Mn, Cu, Mo, Zn

• Fe, Mn, Cu, O, C

• Cu, B, Cl, Fe, Ca

• Ca, Mg, Fe

Which of the following genera is associated with coralloid roots?

• Cycas

• Taxus

• Pinus

• Sequoia

Which of the following element plays an important role in nitrogen fixation

• Zinc

• Molybdenum

• Manganese

• Copper

Assertion : Cattles feed on leaves of maize to get nutrition for growth and development.

Reason: A number of symbiotic bacteria are present in rumen of cattle.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are hue but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Atmospheric nitrogen gas is always fixed by nitrogen-fixing micro-organisms.

Reason : Decomposers release nitrogen gas from dead bodies of plants and animals.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion: Nitrogen is one of the most essential elements of human body.

Reason: All types of prokaryotic organisms are able to fix nitrogen.

• If both assertion and reason are true and reason is the correct explanation of assertion. 

• If both assertion and reason are true but reason is not the correct explanation of assertion. 

• If assertion is true but reason is false. 

• If both assertion and reason are false.

Apiculture is associated with which of the following groups of plants

• Grapes, maize, potato

• Sugarcane, paddy, banana

• Guava, sunflower, strawberry

• Pineapple, sugarcane, strawberry

Leghaemoglobin is produced in response to

• respiration

• photosynthesis

• fatty acid synthesis

• N₂ fixation