Nutrition in Plants

Select three nutrients which are obtained from air by plants

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

Tags

Main Inorganic Nutrients

What is the nutrient that results in such conditions of the leaves below if there is a deficiency of it on a plant?

(Areas between leaf veins turn yellow, red spots on leaf surfaces and lobed leaves)

• Sulphur

• Potassium

• Calcium

• Magnesium

Tags

Main Inorganic Nutrients

Which of the following is a micronutrient?

• Calcium

• Phosphorus

• Sulphur

• Ferrum

Tags

Main Inorganic Nutrients

Explain the functions of nitrogen, phosphorus and potassium elements in NPK fertilizer towards the growth of a plant.

Answer explanation

Nitrogen acts as the main component of proteins, nucleic acids and enzymes in photosynthesis and respiration. Potassium acts as cofactors for some enzymes and maintains plant turgidity. Phosphorus acts as coenzymes in photosynthesis and respiration, and synthesizes nucleic acids, ATP and phospholipids.

Tags

Main Inorganic Nutrients

Which of the following is the function of root cap?

• Increases the total surface area of the roots

• Increases the uptake of water

• Increases the uptake of mineral salts

• Protects the root from damage when going through the soil

Tags

Organ for Water and Mineral Salts Uptake

Explain adaptations of root epidermal cells to carry out their functions in the absorption of water and mineral salts.

Answer explanation

-Closely arranged

-Thin cell walls and water

permeable cell membranes

to facilitate water movement

-Form root hairs by

elongating towards lateral

sides from outer walls

-Root hair are not layered

with cuticle to allow water

absorption

-Root hairs have vacuoles

to store water and mineral

salts

Tags

Organ for Water and Mineral Salts Uptake

What are the two main functions of roots?

• Absorb water and mineral salts from the soil and transport to stem and leaves

• Produce food for the plant by photosynthesis

• Provide support and strength to anchor the plant in soil

• Support the leaves, and conduct water and minerals to the leaves

Tags

Organ for Water and Mineral Salts Uptake

Describe the structure of endodermis and its functions.

Answer explanation

Structure of endodermis:

closely arranged, one-cell thick, have suberin/lignin thickening to form Casparian strips

Function:

Allows water and mineral salts absorbed from soil to enter vascular cylinder, but not air bubbles

Tags

Organ for Water and Mineral Salts Uptake

Which of the following statements differentiate heterotrophic nutrition from autotrophic nutrition?

• Heterotrophic organisms can synthesize their own food

• Heterotrophic organisms consume food and digest food in their bodies

• Heterotrophic organisms synthesise organic materials without light

• Heterotrophic organisms synthesise complex organic compounds from simple non-organic raw materials

Tags

Diversity in Plant Nutrition

Dodder is a non-chlorophyll plant that takes water and nutrients from other plants. The plant has a rootlike structure which penetrates into the stem and then into the xylem and phloem. Which statement is true about the dodder?

• The dodder is a carnivorous plant

• The dodder carries out photosynthesis

• The dodder is a parasitic plant

• The dodder does not kill its host

Tags

Diversity in Plant Nutrition