HARD
11th CBSE
IMPORTANT
Earn 100

What is sigmoid growth curve? Why is it so called?

Important Questions on Plant Growth and Development

MEDIUM
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 11
Where are auxin synthesised in plants? Mention any two of their functions?
MEDIUM
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 1
What are the different phases of growth? Give characteristics of each.
MEDIUM
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 2
What are weedicides? Give their effect on the ecology of a place.
MEDIUM
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 3

Which hormone prevents senescence?  Name its different functions and uses.

MEDIUM
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 4

Name the only gaseous natural plant hormone. Describe its three different kinds of action in plants.

MEDIUM
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 5

Write a brief account of abscisic acid.

HARD
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 6
Name two synthetic auxins. Give four functions of auxins.
MEDIUM
11th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY BIOLOGY VOL. I For XI Class of 10+2>Chapter 19 - Plant Growth and Development>TEST QUESTIONS>Q 7
Which parts of the plant produce gibberellin?  State two functions of this hormone and mention why it was named gibberellin?