$3$(a) (i) Name and explain the property present in normal cells but is lost in cancer cells.

(ii)All normal human cells have genes that may become cancerous under certain conditions. Name them and explain how.(iii)State the role of the following techniques in detection and diagnosis of cancer :

(1) Biopsy and Histopathology (2) Magnetic Resonance Imaging

OR

(b) Large quantities of sewage are generated every day in cities as well as in towns and are treated in Sewage Treatment Plants (STPs) to make them less polluting. Given below is the flow diagram of stages of STP. Study the flow diagram and answer the questions that follow : 2024_CBSE_Biology_Set_Region1_Subset_Set1_Q33__b_p12_21

2024_CBSE_Biology_Set_Region1_Subset_Set1_Q33__b_p12_21

(i) (1) Why is primary effluent passed into large aeration tanks ? (2) What is the 'sediment' formed, referred to as ? Mention its significance. (3) Explain the final step in the settling tank before the treated effluent is released into water bodies. (ii) Name any two organisms commonly used as biofertilisers, belonging to different kingdoms. Write how each one acts as a biofertiliser.

Biology · Microbes in Human Welfare