Class 12 Biology - Chapter Sexual Reproduction in Flowering Plants NCERT Solutions | What is apomixis and what is its importa
Welcome to the NCERT Solutions for Class 12th Biology - Chapter Sexual Reproduction in Flowering Plants. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 18: what is apomixis and what is its importance....
Question 18
What is apomixis and what is its importance?
Answer
Apomixis is the mechanism of seed production without involving the process of meiosis and syngamy. It plays an important role in hybrid seed production. The method of producing hybrid seeds by cultivation is very expensive for farmers. Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis. Apomixis prevents the loss of specific characters in the hybrid. Also, it is a cost-effective method for producing seeds. More Questions From Class 12 Biology - Chapter Sexual Reproduction in Flowering Plants
- Q:- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
- 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:- What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.
- Q:- Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.
- Q:- Differentiate between:
(a) Hypocotyl and epicotyl
(b) Coleoptile and coleorrhiza
(c) Integument and testa
(d) Perisperm and pericarp - Q:- Why is apple called a false fruit? Which part(s) of the flower forms the fruit?
- Q:- Name the parts of an angiosperm flower in which development of male and female gametophyte take place.
- Q:- Explain the role of tapetum in the formation pollen-grain wall.
- Q:- Arrange the following terms in the correct developmental sequence:
Popular Questions of Class 12 Biology
- Q:- Why is reproduction essential for organisms? Answer
- Q:-
Fill in the blanks:
(a) Humans reproduce __________. (asexually/sexually)
(b) Humans are__________. (oviparous/viviparous/ovoviviparous)
(c) Fertilization is __________ in humans. (external/internal)
(d) Male and female gametes are __________. (diploid/haploid)
(e) Zygote is __________. (diploid/haploid)
(f) The process of release of the ovum from a mature follicle is called__________.
(g) Ovulation is induced by a hormone called the __________.
(h) The fusion of male and female gametes is called _____________.
(i) Fertilisation takes place in _____________.
(j) Zygote divides to form _____________which is implanted in uterus.
(k) The structure which provides vascular connection between fetus and uterus is called ____________. - Q:- What do you think is the significance of reproductive health in a society?
- Q:- Mention the advantages of selecting pea plant for experiment by Mendel.
- Q:- Group the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. - Q:- Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory.
- Q:- What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q:- Explain in brief the role of animal husbandry in human welfare.
- Q:- Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?
- Q:- Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
Recently Viewed Questions of Class 12 Biology
- Q:- If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or why not?
- Q:- Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?
- Q:- How do biofertilisers enrich the fertility of the soil?
- Q:- Name the primary and secondary lymphoid organs.
- Q:- How do ecologists estimate the total number of species present in the world?
- Q:- What is vegetative propagation? Give two suitable examples.
- Q:- Differentiate between gametogenesis from embryogenesis.
- Q:- Can we call human evolution as adaptive radiation?
- Q:- List 10 modern-day animals and using the internet resources link it to a corresponding ancient fossil. Name both.
- Q:- Explain what is meant by biofortification.
10 Comment(s) on this Question
Shrusti Kamagond
2020-07-23 14:22:56
Tq sirð
Lakshmi
2019-07-07 15:58:09
Thanku sir!
Razzo
2019-06-22 17:43:23
Nice answer sir but very long
Hannan Shariff
2019-05-26 20:47:39
Good answers sirð¤©ð¤©
Anjali yadav
2019-05-22 14:44:15
Youranswers are veryright but also long. Thank you very much.
Imran
2019-05-16 03:21:22
Perfect answer
Himo
2019-05-14 16:42:24
Easy to learn
Naisha
2019-05-12 16:08:16
Best answer. Thanks a lot ð
RaZa khan
2019-05-02 20:13:19
Very helpful
Troy
2019-04-20 12:28:47
Next question is not there
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