What are plant hormones class 10 ncert

Examinations • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Plant Hormones Phytohormones are chemical compounds present in very low concentrations in plants. They regulate plant development, growth, longevity and reproductive processes. Here, let’s look at the structure and functions of different phytohormones like auxins, gibberellins, cytokinins, ethylene and abscisic acid. Table of Content • • • • • • What is Plant Hormones? Plants need sunlight, water, oxygen, minerals for their growth and development. These are external factors. Apart from these, there are some intrinsic factors that regulate the growth and development of plants. These are called plant hormones or “Phytohormones”. Don’t miss: • Plant hormones are chemical compounds present in very low concentration in plants. They are derivatives of indole (auxins), terpenes (Gibberellins), adenine (Cytokinins), carotenoids (Abscisic acid) and gases (Ethylene). • These hormones are produced in almost all parts of the plant and are transmitted to various parts of the plant. • They may act synergistically or individually. Roles of different hormones can be complementary or antagonistic. • Hormones play an important role in the processes like vernalisation, pho...

What is coordination in plants? Coordination is the ability to use different parts of the plant together, smoothly and efficiently. In plants, coordination is due to the result of a chemical system, wherein plant hormones or phytohormones have a major role. Browse more Topics under Control And Coordination • • • • Movement in plants Plants exhibit two types of movements. • Growth-dependent movements called the Tropic Movements. ( towards or away from a stimulus) • Non-growth dependent movements called the Nastic Movements. ( independent of stimulus) Tropic movements These can be classified again into 5 types. They are: • Phototropism (light) • Geotropism (gravity) • Hydrotropism (water ) • Chemotropism (chemicals) • Thigmotropism (touch) • Phototropism – It is the movement of plants in response to light. The shoot system of a plant exhibits this characteristic. The shoot moves towards the light. • Geotropism – It is the movement of a plant part towards the • Hydrotropism– It is the movement of a plant towards the water. The stimulus here is water. • Chemotropism – It is the movement of plants in response to a chemical stimulus. A classic example of this type of movement is the • Thigmotropism – It is a directional movement in plants in response to touch. For e.g. the plant tendrils climb around any support which they touch. You can download Phytohormones – Hormones in Plants Cheat Sheet by clicking on the download button below Nastic Movements Nastic movements in plants ar...

In the earlier chapter we see various terms related to plants and animals. In this chapter also we will learn some interesting facts about plants and humans. So lets start our discussion with plant hormones. Plant hormones Plant hormones also called as phytohormones because phyto means plants. These plant hormones are the complex organic compounds which have ability to synthesize in plant body. These hormones synthesized at one site and perform their functions at another site. These plant hormones can major role such as growth and development. There are 2 types of movement which generally see in plants : 1.) Directional movement : This type of movement called polar movement. They are of 2 types such as basipetal in which movement occurs from apex to base and acropetal in which movement occurs from base to apex. 2.) Non directional movement: This movement is non polar movement. There are 5 types of major hormones such as A.) Auxin B.) Cytokinin C.) Gibberellin D.) Ethylene E.) Abscisic acid Lets start with our discussion with every hormones and their functions: 1.) Auxin :Auxin it was first discovered by scientist Charles Darwin when he was studying the movement mechanism in plants. Auxin have polar movement and specially basipetal that means it synthesized at apex and will be transported to the base via phloem. Tryptophan is one of the amino acid is precursor of auxin. For the synthesis of auxin tryptophan is required. The auxin is also called as IAA (Indole Acetic Acid). ...

Share on WhatsApp Share on Telegram Share on Facebook Share on Twitter Share on LinkedIn Introduction: Animals can control their movements with the help of a dedicated However, plants respond to certain stimuli with the help of various coordinating processes. That is, coordination in plants is entirely different from control and coordination of animals and humans. Let’s understand, the process of plant coordination in nature and the mechanism of plant movements. What is Coordination in Plants? Let’s take two examples to understand two types of coordination in plants. i) You may have seen and touched the leaves of the touch-me-not plant. As soon as, your hand touches the plant, the leaves will respond to the external stimuli and starts folding. Such kinds of movements can be referred to as independent of growth movements. ii) On the other hand, when a seed germinates, the root and shoot of the seedling start to move downwards and upwards, respectively. That is, the directional movements of the root and shoot are dependent on the growth of the seedling. Such kinds of movements can be referred to as dependent on growth movements. Now, let’s take a detailed view of the first kind of plant coordination. Types of Movements in Plant Coordination: 1. Movement Independent of Growth: Immediate Response to Stimulus i) When you touch the leaves of the touch-me-not plant, it responds immediately and starts to fold. That is, it senses the touch. ii) You may wonder if the coordination in...