Class 12th Biology 2017 Set3 Outside Delhi Board Paper Solution
Question 16
Trace the development of an endosperm after fertilisation with reference to coconut. Mention the importance of endosperm development.
Answer
In coconut Primary Endosperm Nucleus (PEN-3n) undergoes successive nuclear divisions, give rise to free-nuclear endosperm known as coconut water, white kernel is the cellular endosperm , provides nourishment to the growing embryo.
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:- List the harmful effects caused by alcohol/drug abuse.
- Q:- Draw a labeled diagram of female reproductive system.
- Q:- List the various abiotic environmental factors.
- Q:- In the medium where E. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down some time after addition of lactose in the medium?
- Q:- Name important defence mechanisms in plants against herbivory.
- Q:- In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?
- Q:- Explain why meiosis and gametogenesis are always interlinked?
- Q:- What are the major causes of species losses in a geographical region?
- Q:- What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
- Q:- State True/False with explanation
(a) Abortions could happen spontaneously too. (True/False)
(b) Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner. (True/False)
(c) Complete lactation could help as a natural method of contraception. (True/False)
(d) Creating awareness about sex related aspects is an effective method to improve reproductive health of the people. (True/False)