(२) 'पाणी हेच जीवन !' या विधानासंबंधी तुमचे विचार लिहा.

 

(२) 'पाणी हेच जीवन !' या विधानासंबंधी तुमचे विचार लिहा.

पाणी हे पृथ्वीवरचे अमृत आहे. ते सर्व सृष्टीचे संजीवन आहे. पृथ्वीवरील सजीव-निर्जीव सृष्टीला पाण्याची अत्यंत आवश्यकता असते. पाण्याशिवाय पशु-पक्षी, प्राणी व मानवी जीवन कोमेजून जाईल. निसर्ग हिरवागार करण्याची किमया पाण्यामध्ये आहे. पाण्यामुळे गाई-गुरांना हिरवा चारा मिळतो. तर पाण्यामुळे मानवाचे अन्नधान्य शेतात उगवते. जगातील प्रत्येक घटकाची तहान शमवण्याचे सामर्थ्य पाण्यातच असते. पाणी नसेल तर ही पृथ्वी भकास, ओसाड व वैराण होईल आणि पृथ्वीवरील जीवन नष्ट होईल. म्हणून 'पाणी हेच जीवन' हा मानवी इतिहासाचा मूलमंत्र आहे.

(१) आकृतिबंध पूर्ण करा : नारायण सुर्वे गाजवत असलेली

 

Class 10th science to give scientific reason sometimes I plant and animals to perform in aropic respiration

 *(3) Sometimes, higher plants and animals too perform anaerobic respiration.

Ans When there is deficiency of oxygen in the surrounding, the aerobic respiration is not possible. 2 In such case, to survive, higher plants switch over to anaerobic respiration. In some animal tissues in case of oxygen deficiency cells perform anaerobic respiration.

Give Scientific Reason 2.Krebs cycle is also known as citric acid cycle.class 10th science 2

 *(2) Krebs cycle is also known as citric acid cycle.

Ans. Sir Hans Kreb proposed this cycle and hence it is called Krebs cycle. 2 These are series of cyclic chain reactions which begins with acetyl-coenzyme-A molecules which act with molecules of oxaloacetic acid, The reactions are catalysed with the help of specific enzymes. The first molecule formed in this reaction is called citric acid. Therefore, Krebs cycle is also called

Give Scientific Reason (5) Fibres are one of the important nutrients.

Give Scientific Reason 

(5) Fibres are one of the important nutrients.

Ans! Fibres are indigestible substance. They are thrown out along with other useless and undigested 2 matter. This aids in egestion. "Some fibres also help in digestion of other substances. Green leafy vegetables, fruits, cereals etc are considered as important in diet as they supply nutritious fibres. Thus, fibres are considered as one of the important nutrients.

Class 10th science part 2 give scientific reason we feel exhausted after exercising

(4) We feel exhausted after exercising.

Ans. When we undertake constant exercises, there may be shortage of oxygen for the cells. Therefore, our muscles and other tissues perform anaerobic respiration in such condition. In this process, lactic acid is formed. Molecules of ATP produced in oxidation of food are also much less. Thus, there is less energy in the body and accumulation of lactic acid too. All this brings about a feeling of exhaustion.