MEDIUM
10th CBSE
IMPORTANT
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Auxin is a plant hormone that promotes cell elongation and is produced by the apical meristem. It inhibits the growth of lateral buds which are present at nodes (where leaves attach to the stem). As long as sufficient auxin is produced by the apical meristem, the lateral buds remain dormant. A gardener wants the plants in the hedge that he is growing to become bushier with more branches. Which of the following should he do?

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Important Questions on Control and Coordination

MEDIUM
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 11

Shown in the figure below is a plant in which auxin is synthesised at part X of the plant. Geeta took the potted plant and cut off part X. She then took the plant and kept It near a window with sunlight and observed It after 7 days.

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Which of the following Is she Ilkely to have observed?

MEDIUM
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 12
During pollination, plants ensure that the pollen grain from a species germinates on the stigma of the same species. Which of the following ensures this?
EASY
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 14
As first line of defense, stress hormones are released in humans. As an equivalent, which hormone is most likely to be released as first line of defense in plants?
MEDIUM
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 15
There have been reports of plant hormones being found in animal bodies even when they are not synthesised by the animal. What can be the most common pathway of entry of such hormones in animals? 
EASY
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 16
Name one plant hormone that controls directional growth. 
MEDIUM
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 17
Plant hormones are also referred to as growth regulators and can be controlled by a number of stimuli. Mention one point of difference between the functioning of animal growth hormones and plant growth regulators with respect to such control.
MEDIUM
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 18
Sheila saw a snake and instantly jumped back. She then slowly moved away from the snake. What is the difference between the two actions of instantly jumping and walking away? 
EASY
10th CBSE
IMPORTANT
Science Textbook of Competency Based Questions for Class X>Chapter 7 - Control and Coordination>Exercise>Q 20
While on a roller coaster ride, Aditya noticed an increase in his heartbeat and his breathing. Which hormone is responsible for the changes in Aditya's body?