Class 12th Biology 2017 Set2 Outside Delhi Board Paper Solution
Question 18
Different animals respond to changes in their surroundings in different ways. Taking one example each explain "some animals unergo aestivation while some others hibernation". How do fungi respond to adverse climate conditions?
Answer
Some animals unergo aestivation due to summer related problems i.e heat and dessications. Example snail and fish
Some animals go into hibernation due to winter related problems i.e. extreme cold. Example Bear
Fungi form various kind of thick walled spores which help them to survive in unfavourable conditions.
Popular Questions of Class 12th biology
- Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
- Q:- Why is reproduction essential for organisms? Answer
- Q:- Write a short note on
(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals. - Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
- Q:- What is DNA fingerprinting? Mention its application.
- Q:- What is oogenesis? Give a brief account of oogenesis.
- Q:- Describe the structure of a seminiferous tubule.
- Q:- What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
- Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
- Q:- Explain the Law of Dominance using a monohybrid cross.
Recently Viewed Questions of Class 12th biology
- Q:- Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.
- Q:- What measure would you take to prevent water-borne diseases?
- Q:- The second trophic level in a lake is-
(a) Phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes - Q:- What is bagging technique? How is it useful in a plant breeding programme?
- Q:- What are the major causes of species losses in a geographical region?
- Q:- What is spermatogenesis? Briefly describe the process of spermatogenesis.
- Q:- What are transgenic bacteria? Illustrate using any one example.
- Q:- What do you think is the significance of reproductive health in a society?
- Q:- List the various abiotic environmental factors.
- Q:- List all the wastes that you generate, at home, school or during your Trips to other places, could you very easily reduce? Which would be Difficult or rather impossible to reduce?