NCERT Solutions for Chapter: Control and Coordination, Exercise 1: Exercise

Sapna suffers from a condition due to which her average blood sugar level is 174 mg/dl. The average blood sugar level in a healthy is < 140 mg/dl.

Which of the following could be the cause of Sapna's condition.

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?

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.

Which of the following Is she Ilkely to have observed?

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?

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.

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? 

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? 

'Plant growth regulators do not always promote growth.'

Cite one example in support of the above statement and mention the action of the same.