Class 12th Biology 2016 Set3 Outside Delhi Board Paper Solution
Question 14
When do farmers prefer using apomictic seeds ?
Answer
To maintain hybrid characters (year after year in a desired plant), to avoid buying hybrid seeds every year (expensive seeds)
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:- What are Cry proteins? Name an organism that produces it. How has man exploited this protein to his benefit?
- Q:- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
- Q:- Describe the structure of a seminiferous tubule.
- Q:- Two heterozygous parents are crossed. If the two loci are linked what would be the distribution of phenotypic features in F1 generation for a dihybrid cross?
- Q:- What is the significance of the slope of regression in a species − area relationship?
- Q:- Using various resources such as your school library or the internet and discussions with your teacher, trace the evolutionary stages of any one animal say horse.
- Q:- Discuss briefly the following:
(a) Radioactive wastes
(b) Defunct ships and e-wastes
(c) Municipal solid wastes - Q:-
Mention two strategies evolved to prevent self-pollination in flowers.
- Q:- Define
(a) Juvenile phase
(b) Reproductive phase
(c) Senescent phase. - Q:- What is vegetative propagation? Give two suitable examples.