Which of the following statements about eutrophication are true?
I. It can be a naturally occurring process.
II. It is commonly found in standing rather than running water.
III. It can lead to oxygen depletion.
IV. It is commonly associated with high levels of nitrates and sulphates.
V. It is commonly associated with high levels of phosphates and nitrates.

Which of the following statement(s) is/are correct? I. Radial vascular bundles are commonly found in stems. II. Conjoint vascular bundles are found in roots. III. Radial vascular bundles are commonly found in roots. IV. Conjoint vascular bundles are found in sterms and leaves.

Which of the following statements regarding eutrophication are correct ? (i) Eutrophication is the natural ageing of a lake by nutrient enrichment of its water. (ii) Pollutants from human activities like effluents from the industries and homes can radically accelerate the aging process of a lake. This phenomenon is called as cultural or accelerated eutrophication. (iii) The plant nutrients responsible for eutrophication are nitrates and phosphates. (iv) These phosphates and nitrates accelerate the growth of algae, which utilise oxygen and may deoxygenate the water to kill the fish and other aquatic animals.

Which of the following statements regarding eutrophication are correct ? (i) Eutrophication is the natural ageing of a lake by nutrient enrichment of its water. (ii) Pollutants from human activities like effluents from the industries and homes can radically accelerate the aging process of a lake. This phenomenon is called as cultural or accelerated eutrophication. (iii) The plant nutrients responsible for eutrophication are nitrates and phosphates. (iv) These phosphates and nitrates accelerate the growth of algae, which utilise oxygen and may deoxygenate the water to kill the fish and other aquatic animals.

Which of. These statements about Mycoplasma is / are true ? I. Mycoplasma is the smallest cell known. II . They are not prokaryotic in nature . III. They can respire only in the presence of oxygen . IV. They lack cell walls.

Which of. These statements about Mycoplasma is / are true ? I. Mycoplasma is the smallest cell known. II . They are not prokaryotic in nature . III. They can respire only in the presence of oxygen . IV. They lack cell walls.

Which of the following statement(s) is/are correct? I. Radial vascular bundles are commonly found in stems. II. Conjoint vascular bundles are found in roots. III. Radial vascular bundles are commonly found in roots. IV. Conjoint vascular bundles are found in stems and leaves. 1 II and III 2 I, II and III 3 III and IV 4 I and II