Find out the correct sentene about manure
(i) Manure contains large quantites of organic matter and small quantites of nutrients.
(ii) It increases the water holding capacity of sandy soil.
(iii) It helps in draining out of excess of water from clayey soil.
(iv) Its excessive use pollutes environment because it is made of animal excretory waste.

Identify the correct statements from the below. (I) Vermicompost is rich in essential plant nutrients. (II) It improves soil structure texture, aeration, and water holding capacity and prevents soil erosion. (III) It enhances seed germination and ensure good plant growth. (IV) Earthworms are subjected to attack by a variety of pests.

Find the odd sentence out. (i) Biogas primarily consists of methane with CO_(2) and hydrogen (ii) the greater the BOD of waste water the more its polluting potential (iii) World biofuel day is observed on 10th August (iv) Cyclosporin A is obtained from Trichoderma polysporum.

Once there was heavy downpour for about 3 hours in the early morning. Irfan and his family were finding it difficulat to carry out their daily morning chores as the sewer water was flowing back into the toilits, th road in front of their house was flooded with water and they could not move out. On this very serious problem Irfan called a meeting of all the residents. In the meeting Irfan discussed th problem and said that we as using too much polythene bags and other plastic items which we throw here and there. All these move into the drains and sewer lines which get choked and do not allow flow of water. As these are non-biodegradable, they remain as such for a long time. So to overcome this problem, we should use bags made up of cloth or jute which are biodegradable. (i) Answer the following questions : (i) Name a polymer which is biodegradable. Write the sturctures of monomers and the repeating unit. (ii) Write two uses of this polymer. (iii) Write any two values shown by Irfan.

Once there was heavy downpour for about 3 hours in the early morning. Irfan and his family were finding it difficulat to carry out their daily morning chores as the sewer water was flowing back into the toilits, th road in front of their house was flooded with water and they could not move out. On this very serious problem Irfan called a meeting of all the residents. In the meeting Irfan discussed th problem and said that we as using too much polythene bags and other plastic items which we throw here and other plastic items which we throw here and there. All these move into the drains and sewer lines which get choked and do not allow flow of water. As these are non-biodegradable, they remain as such for a long time. So to overcome this problem, we should use bags made up of cloth or jute which are biodegradable. (i) Answer the following questions : (i) Name a polymer which is biodegradable. Write the sturctures of monomers and the repeating unit. (ii) Write two uses of this polymer. (iii) Write any two values shown by Irfan.

Read the given statements and select the correct option. (i) Loamy soil is best suited for plant growth as it contains a mixture of silt, sand and clay. (ii) The process ofhumification is slow in case of organic remains containing a large amount of lignin and cellulose. (iii) Capillary water is the only water available to plant roots as it is present inside the micropores. (iv) Leaves of shade plant have more total chlorophyll per reaction centre, low ratio of chl a and chl b are usually thinner leaves.