EducatorSharmin

    ABA and Stomatal Closure   Q.1. How does abscisic acid function to stimulate the closure of stomata? Ans:  Abscisic acid (ABA) is a plant hormone that is synthesized by any cells in a plant that contain chloroplasts or amyloplasts, especially in stress conditions. The presence of large concentrations of abscisic acid in leaves stimulates stomata to close, reduces the rate of transpiration, and conserves water inside the plant. To close the stomata, the proton pumps stop working and the potassium ions flow out of the cells. This raises the water potential inside the cells, so water passes out by osmosis. The guard cells become flaccid and this closes the stoma.  Q.2. Describe the mechanism of stomatal opening. Ans:  In general, guard cells open during the day and close at night although this rhythm persists in continuous light and in the continuous dark. The cell surface membranes of guard cells contain proton pumps that actively transport hydrogen ions ...

  Pie Charts: A pie chart is most suitable when we want to show the relative size of each data set in proportion to the entire data set. A convenient way of comparing data is by using pie charts. In pie charts, a circle is divided into parts and then the parts are compared. Since it looks like a pie that has been sliced into pieces, such a diagram is known as a pie chart.  * Pie graphs are convenient for displaying information of the type that are measures of part of a whole, given as fractions, ratios, or percentages. * A pie chart is constructed by dividing a circle into different sectors. For example, the pie chart given alongside shows the different fruits that a fruit seller keeps at his shop. We can see that out of all the fruits in the shop, mangoes are the most in number, followed by pears, apples and then oranges. The circle represents the total number of fruits surveyed. The pie chart sh ows the favourite pastimes of 160 students. Study the pie chart and answer the f...

Earth Day Poem:   This is our planet so let's save our planet and promise today we will not cut our trees. We will keep our garbage in the bin. We can make our earth beautiful if we care about that.   Q. What is Earth Day? Earth Day, celebrated on April 22nd, is a day to raise awareness about environmental issues and encourage actions to protect the Earth. It reminds us of the importance of sustainability and inspires us to make eco-friendly choices every day. Q. Why is it Important? Earth Day is important because it raises awareness about environmental issues and motivates people to take action to protect our planet. Q. What is pollution? Pollution is when harmful substances get into the air, water, or land. These substances can come from cars, factories, and litter. Pollution can make the air dirty, the water unsafe to drink, and harm plants and animals. Q. What is Deforestation? Deforestation is when forests are cut down or removed. This often happens to make room fo...

                                                                            Science Experiment Worksheet: A hypothesis about the relationship between two variables predicts how one variable affects the other. It should be testable and falsifiable by experiment. When discussing an experiment you need also to consider possible sources of error and validity of the experiments and be able to suggest ways in which the experiment's reliability could be improved. You should be able to reach a conclusion about the data and use of statistical tests, and perhaps make suggestions for further experimental work. The practical skills that you will develop during your course are tested by a practical examination. In this examination, you will work in a laboratory, answering questions on an examination paper. The qu...