# RD Sharma Solutions Class 7 Mathematics Solutions for Properties of Triangle Exercise 15.1 in Chapter 15 - Properties of Triangle

Question 5 Properties of Triangle Exercise 15.1

A, B. C and D are four points, and no three points are collinear. AC and BD intersect at O. There are eight triangles that you can observe. Name all the triangles

Given A, B. C and D are four points, and no three points are collinear

△ ABC

△ ABD

△ ABO

△ BCD

△ DCO

△ AOD

△ ACD

△ BCD

Video transcript
hi everyone welcome to little learning the question is name the factors which affect the rate of transpiration state their role in each case so which other factors that affect transpiration and we have to stay there pro so which are the factors that effect transpiration light temperature humidity water soil water soil water and it goes on like that so we look in into each factor so the first factor will take it as light all right so light is the first factor so what happens during day time the transpiration increases right so during day time transpiration increases why is that happening because the light stimulates the opening of stomata how this tomato opens during daytime and also during daytime when sunlight is there it warms up the leaf soft so for cooling the plant also transpiration occurs right so this is the reason why transpiration increases during the data so that is the effect of light now second one is temperature so how does temperature affect the rate of transpiration so as temperature increases the transpiration also increases okay so the transpiration rate at 30 degree centigrade maybe three times as that it does at 20 degree so as temperature increases transpiration also increases so we can say that at 30 degrees the leaf may transpire three times as fast acid this at 20 degree so one reason is that the leaves get warmed up and in order to cool the plant transpiration can occur now the third factor is wind so what happens on a windy day transpiration increases right so the transpiration occurs during a windy day because the humid climate or the human surrounding is being carried away humid air is carried away because of the wind and more water gets absorbed into the or more water gets evaporated into the surroundings so because the humid hair humid air sorry humid air is carried away and replaced by dryer okay so because of that on a very windy day transpiration increases the next factor is humidity so what happens during a humid condition when the surrounding is humid it cannot take no any more water into it right it is saturated with the water content so transpiration rate reduces so as humidity increases transpiration reduces this happens because the rate of water absorption by the surrounding is reduced due to humidity okay so it cannot absorb any more water content into it so that is why the rate of evaporation of water from the leaves also get reduced so as humidity increases the transpiration reduces all right now the next factor is soil water okay soil water so how will soil water affect transpiration rate so the plants they almost continuously transpire and if this water loss is not made up from the soil if it is not replaced from the soil then there is a chance that the plant might wilt right so as transpiration increases more water needs to be absorbed more water needs to be absorbed from the soil to replace the water evaporated so what happens if the content soil water is less so if soil water is less then the plant in this tomato closes to reducer transpiration stomata closes and the rate of transpiration reduces so if the soil water is reduced then the transpiration so we can say the soil water is there or if the soil water is more than the transpiration rate will also increase so if the soil water is less or it is not being replaced then the transmission rate also reduces because this tomato closes okay and if the soil water is not replacing the water that is being evaporated or the content of soil water is very low then the plant starts drying up okay so this these are the five fact main factors that affect the transportation i hope you understood this if you have any doubt in this please comment below and subscribe to this channel for getting regular updates thank you
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