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SAI International School
Std -X, Subject- BIOLOGY
Chapter- Control and Coordination
Subtopic- Coordination in Plants- II
Module- 17
Home Assignment-II
Worksheet- II

Q1. The movement of a plant part in response to the force of attraction exerted by the earth is
called

a) hydrotropism
b) geotropism
c) chemotropism
d) phototropism

Q2. The growth of tendrils in pea plants is due to the

a) effect of sunlight on the tendril cells facing the sun
b) effect of gravity on the part of tendril hanging down towards the earth
c) rapid cell division and elongation in tendril cells that are away from the support
d) rapid cell division and elongation in tendril cell in contact with the support

Q3. Most of the plant hormone promote plant growth. A plant hormone which inhibit growth is

a) abscisic acid
b) ethane
c) ascorbic acid
d) cytokinin

Q4. DIRECTION : The following question consist of two statements - Assertion (A) and
Reason (R). Answer these questions selecting the appropriate option given below:
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
e) Both Assertion and Reason are false.
Assertion : Unlike cabbage, sunflower plant has long internodes with leaves that
are far apart.
Reason : Sunflower produces sufficient amounts of Gibberellins during its growing
period.

Q5. Assertion : Auxins are present in the growing tips of the plant.
Reason : Auxin concentration is highest at the tip ofthe root.

Q6. What are the three limitations of the use of electric impulses?

Q7. How does auxin promote the bending of plant parts towards light? Explain.

Q8. Define the terms and give suitable examples: i. phototropism ii. Chemotropism
iii. Geotropism