EASY
9th CBSE
IMPORTANT
Earn 100

Why thickness of stem increases as age advances in dicot plants?

Important Questions on Tissues

MEDIUM
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 74
Why heartwood is considered more durable than sapwood?
EASY
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 75
Sieve tubes do not have nuclei, why are they considered as living cells?
EASY
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 76
Epidermal cells secrete thick and waxy layer in cactus. Why?
EASY
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 77
Why are the surfaces of woody plants impermeable to water and gases?
EASY
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 78
Young stems (twigs) bend but do not break. Why?
EASY
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 79
Why are intervertebral discs are considered to be the strongest form of cartilage?
EASY
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 80
Why do wrinkles appear on the skin with growing age?
EASY
9th CBSE
IMPORTANT
Pearson IIT Foundation Biology>Chapter 2 - Tissues>PRACTICE QUESTIONS>Q 81
In old people knees make a bit crunching sound when they change their posture from sitting position to standing position. Why does this happen?