What is an algal bloom? | Class 12 Biology Chapter Environmental Issues, Environmental Issues NCERT Solutions

Give one example for each of the following:
i. Eurythermal plant species _______________
ii. A hot water spring organism _______________
iii. An organism seen in deep ocean trenches _______________
iv. An organism seen in compost pit _______________
v. A parasitic angiosperm _______________
vi. A stenothermal plant species _______________
vii. Soil organism _______________
viii. A benthic animal _______________
ix. Antifreeze compound seen in antarctic fish _______________
x. An organism which can conform _______________

What are the three types of ecological pyramids. What information is conveyed by each pyramid with regard to structure, function and energy in the ecosystem.

A farmer was facing the problem of low yield from his farm. He was advise to keep a beehive in the vicinity. Why? How would the beehive help in enhancing yield?

Explain as to how protection of biodiversity hot spots alone can reduce up to 30% of the current rate of species extinction.

Why is distillation required for producing certain alcoholic drinks?

Discuss one example, based on your day-to-day observations, showing how loss of one species may lead to the extinction of another.

Name any two industrially important enzymes.

Name the regions marked A, B and C.

What background information did Watson and Crick have made available for developing a model of DNA? What was their contribution?