Which one of the following statements is not correct? O Offspring produced by the asexual reproduction are called clones. Microscopic, motile asexual reproductive structures are called zoospores. In potato, banana and ginger, the plantlets arise from the internodes O present in the modifies stem. Water hyacinth, growing in the standing water, drains oxygen from water that leads to the death of fishes.

Read the following statements about 'Terror of Bengal' and select the correct ones. (i) 'Terror of Bengal' is the name given to water hyacinth (Eichhornia), an algae. (ii) Eichhornia was introduced in India due to its aesthetic value. (iii) Eichhornia drains oxygen from the water which leads to death of fishes.

Study the following statements and choose the correct option. I. Asexual reproduction is common among single celled organisms and organisms with relatively simple organisation II. Conidia, bud, gemmules are common sexual structures III. Runner, rhizome, sucker, tuber, offset, bulb are vegetative propagules IV. The invasive weeds found growing in fresh water bodies is Zostera.

Read the following statement and find out the incorrect statement. (a). Asexual reproduction is common among single-celled organisms, and in plants and animals with relatively complex organisations. (b) In yeast, the division is unequal and small buds are produced that remain attached initially to the parent cell which eventually gets separated and mature into yeast organism (cells). (c). vegetative reproduction is also a type of asexual reproduction. (d) While in animals and other simple organisms the term vegetative reproduction is used unambiguously, in plants the term asexual reproduction is frequently used. (e) Water hyacinth is also called 'Terror of Bengal'

Read the following statements and select the correct ones. (i) Conidia are the asexual propagules restricted to Kingdom Fungi. (ii) Apiece of potato tuber having at least one eye (or node) is capable of giving rise to a new plant. (iii) Ginger propagates vegetatively with the help of its underground roots. (iv) Fleshy buds which take part in vegetative propagation are called bulbilsm present in Dioscorea, Agave, etc.

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.