CBSE ADDA

10th Biology- Ch How Do Organisms Reproduce? solved Board questions Q1) What is the importance of DNA copying in reproduction? Ans: DNA is the genetic material present in the cells of all organisms. The genetic information from, generation to generation is carried by DNA. It is therefore possible for the organism to produce organism of its own type due to DNA copying only. For the inheritance of traits of the parent, DNA copying is a must. DNA copying also brings about variation, which forms the basis for the origin of new species. Q2)What are the changes seen in girls at the time of puberty? Ans-i) Enlargement of breasts with the darkening of skin of the nipples. ii) growth of hair in the genital region and in armpits occurs. iii) onset of menstruation. Q3) If a woman is using a copper-Twill it helps in protecting her from sexually transmitted diseases (STD’s)? Ans- No, using copper-T will not protect a woman against catching STD. Copper-T is a device which will only g

Class 10 Biology MCQ  ((Multiple choice questions)  How do organisms reproduce?    1. Which of the following is a working copy (a) RNA (b) Protein (c) Fats (d) DNA 2. Which of the following is the blue print of body design & body function (a) RNA (b) Protein (c) DNA (d) Amino acid 3. Spore formation occurs in (a) Yeast (b) Hydra (c) Amoeba (d) Rhizopus 4. Which of the following can undergo regeneration (a) Flat worm (b) Round worm (c) Rhizopus (d) Amoeba 5. Rose is multiplied by (a) tissue culture (b) cutting (c) Layering (d) seeds 6. Pollen grains are produced by (a) ovary (b) anther (c) filament (d) stigma 7. The male sex organ of a flower is (a) stamen (b) sepal (c) petal (d) carpel 8. Which one of the following is a unisexual flower (a) china rose (b) cucumber (c) rose (d) jasmine 9. Male gametes are produced by (a)pollen grains (b) embryo sac (c) sigma (d) ovary 10. Receptive part of carpel is (a) ovary (b) Stigma (c) placenta (d) style

Reproduction: - Reproduction is the process of formation of new young individuals by the grown up individuals that look very much like them. It is one of the most important and fundamental properties of living organisms by which every kind of living organism multiples to form new individuals of its own kind. Thus, reproduction is meant for the continuation of the species. Reproduction, thus, creates new life and is essential for the perpetuation of species. It gives rise to new organisms with the same basic characteristics as their parents. It plays an important role in evolution by transmitting favorable variations from one generation to another. Significance of Reproduction:- 1.      Continuation of Life.  Reproduction is essential for continuation of life on earth. In its absence   life will be wiped out of earth within span of some years. 2.      Perpetuation of Species.  Reproduction carries the genetic characteristics of the parents into   the new individua