Take two glass troughs A and B and fill each one of them two-thirds with soil. In trough A plant a tiny seedling. In trough B plant a similar seedling and place a clay pot inside the soil. Water the soil in trough A daily and uniformly. Do not water the soil in trough B but put some water in the claRead more
Take two glass troughs A and B and fill each one of them two-thirds with soil. In trough A plant a tiny seedling. In trough B plant a similar seedling and place a clay pot inside the soil. Water the soil in trough A daily and uniformly. Do not water the soil in trough B but put some water in the clay pot. Leave both the troughs for a few days.
Now, dig up the seedlings carefully from both the troughs without damaging their roots. We will find that the root of seedling in trough A is straight. On the other hand, the root of seedling in trough B is found to be bent to the right side i.e., towards the clay pot containing water.
In trough A, the root of the seedling gets water from both sides. But in trough B, the roots get water oozing out from the clay pot which is kept on the right side. Therefore, the root of seedling in trough B grows and bends towards the source of water to the right side. This experiment shows that the root of a plant grows towards water. In other words, the root of a plant is hydrotropism.
When the tip of a tendril touches a support, then the auxins present in its tip move to that side of tip which is away from the support. Auxins promote growth. So, due to more auxins in it, the side of tendril away from the support grows faster (and becomes longer) than the side which is in contactRead more
When the tip of a tendril touches a support, then the auxins present in its tip move to that side of tip which is away from the support. Auxins promote growth. So, due to more auxins in it, the side of tendril away from the support grows faster (and becomes longer) than the side which is in contact with the support and makes the tendril twirl (or bend) around the support.
Movement of leaves of the sensitive plant It is a nastic movement which does not depend on the direction of stimulus applied. The stimulus is touch. Movement of a shoot towards light It is a tropic movement which depends on the direction of stimulus applied. The stimulus is light.
Movement of leaves of the sensitive plant
It is a nastic movement which does not depend on the direction of stimulus applied. The stimulus is touch.
Movement of a shoot towards light
It is a tropic movement which depends on the direction of stimulus applied. The stimulus is light.
Plant hormones are the chemical substances which help in controlling growth, flowering, height, development of plants and their response to the environment. Different types of plant hormones are – auxins, gibberllins, cytokinins, abscisic acid and ethylene.
Plant hormones are the chemical substances which help in controlling growth, flowering, height, development of plants and their response to the environment.
Different types of plant hormones are – auxins, gibberllins, cytokinins, abscisic acid and ethylene.
The process of reproduction results in the production of off springs which resemble to their parents. This means during the reproduction there must be a transfer of the blueprint of the body design from parent to the off springs. As we know DNA contains all the information that passes from parents tRead more
The process of reproduction results in the production of off springs which resemble to their parents. This means during the reproduction there must be a transfer of the blueprint of the body design from parent to the off springs. As we know DNA contains all the information that passes from parents to the next generation, so before reproduction, DNA is copied in the parent cell. Out of these two copies, one copy is passed to the newly formed individual.
Vegetative propagation makes possible for the propagation of plants such as banana, orange, rose and jasmine that have lo6t the capacity to Produce seeds. Moreover, all plants produced through vegetative propagation are genetically similar to the parent plant.
Vegetative propagation makes possible for the propagation of plants such as banana, orange, rose and jasmine that have lo6t the capacity to Produce seeds. Moreover, all plants produced through vegetative propagation are genetically similar to the parent plant.
Complex organisms are not simply a random collection of cells where specialized cells are organised as tissues, and tissues ale organised into organs which then have to be placed at definite positions in the body. In such a carefully organised situation, it is not easy to develoP organism through reRead more
Complex organisms are not simply a random collection of cells where specialized cells are organised as tissues, and tissues ale organised into organs which then have to be placed at definite positions in the body. In such a carefully organised situation, it is not easy to develoP organism through regeneration.
Spores formed are covered by thick walls that protect them from adverse conditions. During favourable condition thick resistant wall breaks down and new organism grows from it. Spores are very light weight and they easily get dispersed through winds which give them more variations and thus better chRead more
Spores formed are covered by
thick walls that protect them from adverse conditions. During favourable condition thick resistant wall breaks down and new organism grows from it.
Spores are very light weight and they easily get dispersed through winds which give them more variations and thus better chances of survival.
When two new daughter cells are formed as a result of fission. It is called binary fission, e.g., Amoeba. When many daughter cells are formed as a result of fission, this is called multiple fission, e.g., Malarial parasite.
When two new daughter cells are formed as a result of fission. It is called binary fission, e.g., Amoeba.
When many daughter cells are formed as a result of fission, this is called multiple fission, e.g., Malarial parasite.
Design an experiment to demonstrate hydrotropism.
Take two glass troughs A and B and fill each one of them two-thirds with soil. In trough A plant a tiny seedling. In trough B plant a similar seedling and place a clay pot inside the soil. Water the soil in trough A daily and uniformly. Do not water the soil in trough B but put some water in the claRead more
Take two glass troughs A and B and fill each one of them two-thirds with soil. In trough A plant a tiny seedling. In trough B plant a similar seedling and place a clay pot inside the soil. Water the soil in trough A daily and uniformly. Do not water the soil in trough B but put some water in the clay pot. Leave both the troughs for a few days.
See lessNow, dig up the seedlings carefully from both the troughs without damaging their roots. We will find that the root of seedling in trough A is straight. On the other hand, the root of seedling in trough B is found to be bent to the right side i.e., towards the clay pot containing water.
In trough A, the root of the seedling gets water from both sides. But in trough B, the roots get water oozing out from the clay pot which is kept on the right side. Therefore, the root of seedling in trough B grows and bends towards the source of water to the right side. This experiment shows that the root of a plant grows towards water. In other words, the root of a plant is hydrotropism.
How do auxins promote the growth of a tendril around a support?
When the tip of a tendril touches a support, then the auxins present in its tip move to that side of tip which is away from the support. Auxins promote growth. So, due to more auxins in it, the side of tendril away from the support grows faster (and becomes longer) than the side which is in contactRead more
When the tip of a tendril touches a support, then the auxins present in its tip move to that side of tip which is away from the support. Auxins promote growth. So, due to more auxins in it, the side of tendril away from the support grows faster (and becomes longer) than the side which is in contact with the support and makes the tendril twirl (or bend) around the support.
See lessGive an example of a plant hormone that promotes growth.
Auxin helps in growth of the stem of the plant.
Auxin helps in growth of the stem of the plant.
See lessHow is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
Movement of leaves of the sensitive plant It is a nastic movement which does not depend on the direction of stimulus applied. The stimulus is touch. Movement of a shoot towards light It is a tropic movement which depends on the direction of stimulus applied. The stimulus is light.
Movement of leaves of the sensitive plant
It is a nastic movement which does not depend on the direction of stimulus applied. The stimulus is touch.
Movement of a shoot towards light
See lessIt is a tropic movement which depends on the direction of stimulus applied. The stimulus is light.
What are plant hormones? Name a plant hormone that promotes growth in plants.
Plant hormones are the chemical substances which help in controlling growth, flowering, height, development of plants and their response to the environment. Different types of plant hormones are – auxins, gibberllins, cytokinins, abscisic acid and ethylene.
Plant hormones are the chemical substances which help in controlling growth, flowering, height, development of plants and their response to the environment.
Different types of plant hormones are – auxins, gibberllins, cytokinins, abscisic acid and ethylene.
See lessWhy is DNA copying an essential part of the process of reproduction?
The process of reproduction results in the production of off springs which resemble to their parents. This means during the reproduction there must be a transfer of the blueprint of the body design from parent to the off springs. As we know DNA contains all the information that passes from parents tRead more
The process of reproduction results in the production of off springs which resemble to their parents. This means during the reproduction there must be a transfer of the blueprint of the body design from parent to the off springs. As we know DNA contains all the information that passes from parents to the next generation, so before reproduction, DNA is copied in the parent cell. Out of these two copies, one copy is passed to the newly formed individual.
See lessWhy is vegetative propagation practised for growing some types of plants?
Vegetative propagation makes possible for the propagation of plants such as banana, orange, rose and jasmine that have lo6t the capacity to Produce seeds. Moreover, all plants produced through vegetative propagation are genetically similar to the parent plant.
Vegetative propagation makes possible for the propagation of plants such as banana, orange, rose and jasmine that have lo6t the capacity to Produce seeds. Moreover, all plants produced through vegetative propagation are genetically similar to the parent plant.
See lessCan you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Complex organisms are not simply a random collection of cells where specialized cells are organised as tissues, and tissues ale organised into organs which then have to be placed at definite positions in the body. In such a carefully organised situation, it is not easy to develoP organism through reRead more
Complex organisms are not simply a random collection of cells where specialized cells are organised as tissues, and tissues ale organised into organs which then have to be placed at definite positions in the body. In such a carefully organised situation, it is not easy to develoP organism through regeneration.
See lessHow will an organism be benefited if it reproduces through spores?
Spores formed are covered by thick walls that protect them from adverse conditions. During favourable condition thick resistant wall breaks down and new organism grows from it. Spores are very light weight and they easily get dispersed through winds which give them more variations and thus better chRead more
Spores formed are covered by
See lessthick walls that protect them from adverse conditions. During favourable condition thick resistant wall breaks down and new organism grows from it.
Spores are very light weight and they easily get dispersed through winds which give them more variations and thus better chances of survival.
How does binary fission differ from multiple fission?
When two new daughter cells are formed as a result of fission. It is called binary fission, e.g., Amoeba. When many daughter cells are formed as a result of fission, this is called multiple fission, e.g., Malarial parasite.
When two new daughter cells are formed as a result of fission. It is called binary fission, e.g., Amoeba.
See lessWhen many daughter cells are formed as a result of fission, this is called multiple fission, e.g., Malarial parasite.