Chemical Coordination in Plants

Class 10 Biology Chapter 6
Chemical Coordination in Plants
Important Questions

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Here, you'll find important questions related to Chapter 6: Chemical Coordination in Plants For ICSE Class 10 Biology. These questions have been crafted to assist students in their preparation for the ICSE Class 10 Biology Examination in 2023–24. By practising various question types, students can clarify their doubts, enhance their exam readiness, boost their confidence, and refine their problem-solving skills.


In the sixth chapter of ICSE Class 10 Biology, we delve into the intriguing world of "Chemical Coordination in Plants." This chapter unravels the intricacies of how plants, despite their seemingly stationary nature, employ a sophisticated system of chemical signals and coordination to respond to their environment and thrive. From regulating growth and development to coping with environmental stresses, plants employ a range of chemical messengers and receptors that orchestrate their responses. As students gear up for their ICSE Class 10 Biology examination, the importance of mastering this chapter becomes evident. To aid in your preparation, we have compiled a series of biology questions for Class 10 ICSE that specifically target the core concepts of chemical coordination in plants. These questions are designed to help you grasp the critical knowledge required for the exam. So, let's embark on a journey through the captivating realm of chemical coordination in plants while addressing some of the important questions of biology Class 10 ICSE, ensuring a comprehensive understanding of this vital topic.

What is Chemical Coordination in Plants?

Chemical coordination in plants refers to the intricate system by which plants use chemical substances, known as hormones, to regulate various physiological processes. Unlike animals, plants lack a nervous system, making chemicals signalling their primary means of communication within their own structures and with the external environment. These hormones play a pivotal role in coordinating growth, development, and responses to environmental stimuli.
There are several key plant hormones, each with its specific functions. For instance, auxins are responsible for controlling cell elongation and phototropism (the bending of plant parts towards light), gibberellins promote stem elongation and fruit growth, cytokinins regulate cell division and differentiation, abscisic acid is involved in stress responses and dormancy, and ethylene influences fruit ripening and senescence.
Chemical coordination also encompasses the interaction between different hormones, creating a delicate balance that ensures plants can adapt and thrive in their ever-changing surroundings. By understanding this complex network of chemical signals and responses, scientists and botanists can manipulate plant growth and development, which has practical applications in agriculture and horticulture.
In the context of ICSE Class 10 Biology, the study of chemical coordination in plants is crucial, as it not only enriches our understanding of plant biology but also offers valuable insights into the strategies plants employ to survive and thrive in their environment.

icse class 10 biology questions and answers

Class 10 Biology Chemical Coordination in Plants Important Questions and Answers

Q1. Which of the following is not an effect of ethylene?


(a) Promotes senescence and abscission of plant organs
(b) Breaks seed and bud dormancy
(c) Hastens fruit ripening
(d) Helps to overcome apical dominance

Ans. (d)  

Auxin is the hormone that helps in overcoming apical dominance.

Q2. A plant hormone used for inducing Morphogenesis in plant tissue culture is :


(a) Ethylene 
(b) Gibberellin
(c) Cytokinin 
(d) Abscisic acid

Ans. (c)
Cytokinin induces morphogenesis in plants by promoting cell division and differentiation.

Q3. Give one main difference between the plant and animal growth.

Animals stop growing in size after they reach maturity whereas plants continue to grow in size indefinitely.

Q4. What is apical dominance?

It is a phenomenon in which the apical bud suppresses the growth of lateral buds. The lateral buds can develop into new branches only when the apical bud is removed.

Q5. Give an example to describe Chemotropism.

Chemotropism is the tropic movement of plant parts in response to some chemical. For example, the movement of the pollen tube towards the ovary takes place due to the absorption of calcium and borate from the style of carpel.

icse class 10 biology questions and answersicse class 10 biology questions and answers

ICSE Class 10 Biology Chapter wise Important Questions

Chapter No. Chapter Name
Chapter 1 Structure of Chromosome, Cell Cycle and Cell division
Chapter 2 Genetics: Mendel's law of Inheritance
Chapter 3 Absorption by Roots- The Processes Involved
Chapter 4 Transpiration
Chapter 5 Photosynthesis
Chapter 6 Chemical Coordination in Plants
Chapter 7 The Circulatory System
Chapter 8 The Excretory System
Chapter 9 The Nervous System and Sense Organs
Chapter 10 The Endocrine System
Chapter 11 The Reproductive System
Chapter 12 Human Population
Chapter 13 Human Evolution
Chapter 14 Pollution


As you prepare for your ICSE Class 10 Biology examination, remember that mastering the concept of chemical coordination in plants is essential. It not only forms a crucial part of your curriculum but also equips you with a deeper understanding of the fascinating mechanisms that drive plant life. For those seeking additional guidance and practice, offers a valuable resource in the form of a comprehensive collection of questions.

Frequently Asked Questions

Q1 : What are chemical messengers?

Ans: A chemical messenger is a compound that helps in the transmission of messages. Examples include hormones and neurotransmitters.

Q2 : What is germination?

Ans:  The process of formation of a fully developed plant from a spore or seed is termed germination. It occurs after a period of dormancy.

Q3 : What are epicotyl and hypocotyl?

Ans: The epicotyl terminates with a plumule, while a hypocotyl terminates with a radical and pulls the seed above the ground during germination.

Q4 : What is the difference between coordination in plants and animal cells?

Ans:  In animals, coordination takes place via hormones and nervous tissue. While in plants coordination is done via chemical substances.

Q5 : Which type of coordination is found in Plants?

Ans: In plants, coordination is primarily achieved through a process known as "chemical coordination. Plant hormones, such as auxins, gibberellins, cytokinins, abscisic acid, and ethylene, play a crucial role in plant coordination. These hormones are synthesised in specific plant tissues and are transported to target cells or organs, where they elicit responses. Each type of plant hormone has specific functions, such as controlling cell elongation, promoting stem growth, regulating cell division, responding to stress, and influencing fruit ripening. This chemical coordination allows plants to adapt and respond to changes in light, gravity, temperature, water availability, and other environmental factors. It enables them to optimise their growth, direct roots and shoots, and adapt to various conditions to ensure their survival and reproduction.

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