Study the picture and answer the question. What is the function of the perforated (having fine holes) cell walls of the phloem cells?

Phloem is the vascular tissue responsible for the conduction of organic substances. The end walls of phloem cells (sieve tube cells) have holes and are perforated like a sieve. So, they are called sieve plates, which bear the sieve pores. The function of the perforated (having fine walls) cell walls of the phloem cells is to allow easy passage of substances (food and minerals) from one vessel to the other inside the plant.

Study the picture and answer the question. What is the composition of the food that is transported by the phloem?

The transport of soluble product of photosynthesis ot food from leaves to other parts of plants is called translocation. The composition of the food that is translocated by the phloem is made of sugars, amino acids, oligosaccharides, etc. It is also called phloem sap.

E M B I B E

CONCERT Science 7>Chapter 11 - Transportation in Animals and Plants>STEP OUT>Q 1

MEDIUM

7th CBSE

IMPORTANT

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Study the picture and answer the question.

The xylem tissue of a plant has thick, stiffened walls. How does this help the plant?

Important Questions on Transportation in Animals and Plants

MEDIUM

7th CBSE

IMPORTANT

CONCERT Science 7>Chapter 11 - Transportation in Animals and Plants>STEP OUT>Q 1

Study the pictures and answer the questions.
Question Image

The xylem allows only the one-way flow of substances, like the flow through a pipeline. But the phloem allows the transport of substances both up and down the stem. Why is this important?