Homework Practice

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Nutrition in Plants: Minerals and Special Modes

Minerals and Special Nutrition

Question 1mcq

A farmer adds compost to a field every season. Which reason is most scientific?

A.Compost removes the need for sunlight.

B.Compost changes all plants into animals.

C.Compost replenishes nutrients and improves soil for plant growth.

D.Compost stops roots from absorbing water.

Question 2mcq

A potted plant has pale yellow leaves even though it receives sunlight and water. Which missing factor is a reasonable possibility?

A.The plant has too much oxygen for photosynthesis.

B.The plant has stopped needing chlorophyll.

C.The pot is producing glucose for the plant.

D.Mineral nutrients in the soil may be insufficient.

Question 3mcq

In lichens, an alga and a fungus live together. Which statement best explains this relationship?

A.The alga prepares food and the fungus provides shelter and water support.

B.The fungus eats the alga completely on the first day.

C.Both organisms stop needing food.

D.The alga absorbs cooked food from the fungus only.

Question 4mcq

Why are Rhizobium bacteria helpful in legume root nodules?

A.They block all water from entering roots.

B.They fix atmospheric nitrogen into forms plants can use.

C.They remove chlorophyll from leaves.

D.They convert oxygen into sunlight.

Question 5mcq

Cuscuta winds around another plant and takes ready-made food from it. What type of nutrition does this show?

A.Autotrophic nutrition

B.Symbiotic nutrition

C.Parasitic nutrition

D.Insectivorous nutrition

Question 6mcq

Why does a pitcher plant trap insects even though it is green and can photosynthesize?

A.It cannot make any food by photosynthesis.

B.It traps insects only to get sunlight.

C.It uses insects instead of water for photosynthesis.

D.It obtains extra nutrients such as nitrogen from insects, especially in nutrient-poor soil.

Question 7mcq

A plant near a window bends toward the light. Which explanation uses plant nutrition correctly?

A.Leaves grow toward light because light helps photosynthesis.

B.Roots bend toward light because they make starch.

C.The plant is trying to eat the glass.

D.Light enters mainly through flowers for digestion.

Question 8mcq

Assertion: A healthy plant still needs minerals from soil. Reason: Photosynthesis produces glucose, but minerals are needed for normal growth. Choose the correct option.

A.Both assertion and reason are true, but the reason does not explain the assertion.

B.Both assertion and reason are true, and the reason explains the assertion.

C.The assertion is true but the reason is false.

D.The assertion is false but the reason is true.

Question 9mcq

Which of these helps naturally restore nitrogen in soil?

A.Keeping plants in a dark cupboard

B.Removing all decomposers from soil

C.Growing leguminous plants with Rhizobium in root nodules

D.Covering leaves with oil

Question 10mcq

Which comparison is correct?

A.Cuscuta makes all its food; pitcher plant has no leaves.

B.Both Cuscuta and pitcher plant obtain nutrition in exactly the same way.

C.Pitcher plant is a parasite on trees; Cuscuta traps insects.

D.Cuscuta takes food from a host; pitcher plant traps insects for extra nutrients.