NCERT Solutions for Class 12 Biology Chapter 1 – Reproduction in Organisms
Our NCERT Solutions for Class 12 Biology Chapter 1- Reproduction in Organisms prepares you for CBSE Class 12 Board exams. The chapter of NCERT Solutions for Class 12 Biology helps you get a thorough awareness of reproduction which is fundamental to existence. It primarily deals with the two methods of reproduction, namely asexual reproduction and sexual reproduction. It elaborates about the three phases of growth of an organism, namely the juvenile phase, the reproductive phase, and the senescent phase. It also throws light on various types of asexual reproduction such as vegetative propagation, binary fission, multiple fission, sporulation, fragmentation, regeneration and budding. It explicitly elaborates sexual reproduction in higher organisms.
The exercise of this chapter comprises 18 questions in total. Our subject experts have written all the answers to 18 questions in a student-friendly manner. Some salient questions deal with external and internal fertilisation that refer to oviparous and viviparous organisms. They help you understand the complexities of reproduction and how the different species generate offspring and prevent extinction.
Our CBSE NCERT Class 12 Biology Chapter 1 solutions cover all topics and subtopics of the chapter in detail. They are easy to understand, to the point and accurate. They have been specifically drafted to make learning a more natural, enjoyable and happy process. Our solution follows the NCERT and CBSE guidelines. They help you become thorough with the chapter quickly, clear all your doubts instantly and score high marks in your board exams.
Introduction to Class 12 Biology Chapter – Reproduction in Organisms
Our NCERT Solutions for Chapter 1- Reproduction in Organisms cover all concepts related to reproduction in organisms. Some of the topics and sub-topics covered in this chapter are given below.
- The universal need for reproduction
NCERT Solutions for Class 12 Biology Chapter 1- Reproduction in Organisms stress on the great importance of multiplication of life forms. It states that Innumerable generations have reproduced their kind. Evolution results from reproduction. Continuity of life is maintained. It also tells you that without reproduction, the species will become extinct. It introduces you to the concept of sexual and asexual reproduction.
- Differences between sexual and asexual reproduction
This section of NCERT CBSE Class 12 Biology Chapter 1 tells you that two parents of the opposite sex reproduce sexually. Reptiles, birds, and mammals practice sexual reproduction. Genes intermingle, and genetically identical offspring are produced. Evolutionary and survival advantages are the result of sexual reproduction.
Here you will also learn that a single parent contributes to asexual reproduction, and the offspring is an exact copy of the parent. Buds, fragments, and fission are some asexual reproduction methods. Ginger, through vegetative propagation, and starfish through fragmentation are examples of asexual reproduction.
This section gives you the fundamental differences between the two main types of reproduction.
- Asexual and sexual reproduction
This section of Class 12 Biology Reproduction in Organisms teaches you the meaning of both sexual and asexual reproductions. Sexual reproduction and takes place by the fusion of male and female gametes. The variants produced can adapt to a variety of environments. Asexual reproduction produces clones that are identical to the single parent.
- Types of Asexual Reproduction
This section teaches you that vegetative propagation does not require seeds or spores. It is a kind of asexual reproduction. Some plants propagate through bulbs and tubers, rhizomes, and suckers. Only one parent gets involved, and there is no fusion of male and female gametes. Apart from vegetative propagation, other asexual reproduction methods covered here include regeneration, fragmentation, sporulation, budding and fission. This chapter talks in details about various types of fission such as binary fission, simple binary fission, longitudinal binary fission, oblique binary fission, transverse binary fission and multiple fission.
- Higher organisms and sexual reproduction
This is a very important part of CBSE NCERT Class 12 Biology Chapter 1 It teaches you that the complex advantage of sexual reproduction comes from new variations in the offspring through the DNA combinations of two individuals. Coping with the environment and surviving the challenges is better with sexual reproduction. In asexual reproduction, there are no genetic differences between the parent and offspring.
- Potato and Bryophyllum plants
This section tells you that a potato has several eyes on the surface. Each bud, when the potato is put in soil, grows into a new potato plant that is identical to the single parent. Notice that the leaves of bryophyllum plants have adventitious buds on the margin. These buds in contact with the soil grow into small plants.
- 3 phases of growth
Here you will learn that the growth is divided into three phases, namely, the juvenile phase, the reproductive phase, and the senescent phase. The juvenile phase extends from birth to before reproductive maturity. The reproductive phase represents the period when the organism reproduces. The senescent phase is the old age and loss of ability to reproduce.
CBSE NCERT Class 12 Biology Chapter 1- Reproduction in Organisms Exercises
Our CBSE NCERT Solutions for Class 12 Biology Chapter – Reproduction in Organisms answer all 18 questions of the exercise of the chapter in detail to prepare you thoroughly for your board exams. The questions of this chapter have been discussed below.
- Question 1 deals with the absolute need for reproduction to propagate life forms and avoid decimation.
- Question 2 asks you to explain why sexual reproduction as a more robust alternative to asexual reproduction.
- Question 3 helps an understanding of clones that are genetically identical with the single parent that produces them.
- Question 4 needs you to explain why or why not an offspring born of sexual reproduction has a stronger chance of survival because of their unique genetic code.
- Question 5 is a differential question that asks you to cite differences between the offspring born of sexual and asexual reproduction.
- Question 6 is a differential question that needs you to compare sexual and asexual reproduction.
- Question 7 needs you to explain vegetative reproduction with examples.
- Question 8 is a definition based question that asks you to define juvenile, reproductive and senescent phases.
- Question 9 needs you to explain why higher organisms have resorted to sexual reproduction in spite of their complexity.
- Question 10 asks you why meiosis and gametogenesis are interconnected.
- Question 11 requires you to categorise parts of the flowering plant, as a haploid (n) or diploid (2n).
- Question 12 needs you to elaborate on external fertilisation and its cons.
- Question 13 is a differential question. It needs you to make a comparison of the zoospore and zygote.
- Question 14 is also a differential question that needs you to differentiate between gametogenesis and embryogenesis.
- Question 15 requires you to explain the changes in the flower after fertilisation.
- Question 16 deals with the characteristics of bisexual flowers.
- Question 17 requires you to examine a cucurbit plant and identify staminate and pistillate flowers.
- Question 18 needs you to cite why greater risks are faced by offspring of oviparous animals compared to the offsprings of viviparous animals.
Benefits of NCERT CBSE Class 12 Biology Chapter 1
Some of the key advantages of learning and revising the chapter from NCERT Solutions for Class 12 Biology Chapter 1- Reproduction in Organisms are listed below.
- Our NCERT Solutions promote fast and efficient learning.
- They make learning fun, interesting, engaging, interactive, and efficient.
- They have been drafted as per the latest CBSE Class 12 Biology Syllabus.
- Our NCERT Solutions answer all questions from all exercises in a step by step manner.
- They are systematic and follow a logical flow. This helps you learn faster and remember more.
- Our smart study techniques and learning shortcuts help you learn quickly and score more marks in your Class 12 biology board exams.
- They cover a wide range of question types important from exam point of view
- They include relevant examples, detailed explanations and illustrative diagrams wherever necessary to help you learn efficiently.