MEDIUM
Lower Secondary Stage 8
IMPORTANT
Earn 100

The stem of a plant contains xylem tubes. Name two substances transported in the xylem.

Important Questions on Respiration and Circulation

MEDIUM
Lower Secondary Stage 8
IMPORTANT
Pierre puts the stem of a white flower in a pot of red food colouring mixed with water. After 24 hours the white flower turns pink. Explain why.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Xylem cells have thick walls stiffened with lignin. Explain how this feature makes xylem adapted to transporting substances. 
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Why does water move up a stem more quickly on a hot day than on a cool day?
MEDIUM
Lower Secondary Stage 8
IMPORTANT

Carlos has a celery stalk with leaves. He cuts the bottom off the stalk. Then he puts the stalk in a glass of water mixed with blue food colouring. The next morning, the celery leaves are blue. Carlos cuts the stalk halfway up and sees small blue circles within the stalk. 

Explain his observations.

MEDIUM
Lower Secondary Stage 8
IMPORTANT

Carlos has a celery stalk with leaves. He cuts the bottom off the stalk. Then he puts the stalk in a glass of water mixed with blue food colouring. The next morning, the celery leaves are blue. Carlos cuts the stalk halfway up and sees small blue circles within the stalk.

What are the blue circles inside the stalk?

MEDIUM
Lower Secondary Stage 8
IMPORTANT

Carlos has a celery stalk with leaves. He cuts the bottom off the stalk. Then he puts the stalk in a glass of water mixed with blue food colouring. The next morning, the celery leaves are blue. Carlos cuts the stalk halfway up and sees small blue circles within the stalk. 

Why have the leaves turned blue?

MEDIUM
Lower Secondary Stage 8
IMPORTANT

Carlos has a celery stalk with leaves. He cuts the bottom off the stalk. Then he puts the stalk in a glass of water mixed with blue food colouring.
The next morning, the celery leaves are blue. Carlos cuts the stalk halfway up and sees small blue circles within the stalk. 

Carlos's friend says that if you cut the leaves off a celery stalk, less water will be taken in by the stalk.

Plan an investigation method to find out if this might be true.

EASY
Lower Secondary Stage 8
IMPORTANT

The diagram shows the ribcage.

Question Image

Name an organ protected by the ribcage that pumps blood.