Ncert – class 10- science – Chapter 7 – How Do Organisms Reproduce 2 Welcome to your Ncert - class 10- science - Chapter 7 – How Do Organisms Reproduce 2 1. Although organisms die, their kind continues to live on Earth. Which characteristic of living organisms makes this possible? Reproduction Respiration Movement Excretion None 2. What is the purpose of combining variations from two or more individuals by sexual reproduction? To ensure no variants are created. To make DNA copying mechanism accurate. To create new combinations of variants. To decrease the chances of survival. None 3. During adolescence, the body of boys and girls undergoes certain changes. Given below are a few of those changes. Find which changes occur in boys:(a) Broad shoulders(b) Wider chests(c) Broadening of the hip region(d) Development of muscles(e) Development of mammary glands(f) Growth of facial hair(g) Acne and pimples on the face(h) Development of sex organs(i) High-pitched voice(j) Growth of pubic hair Development of mammary glands, acne and pimples on face, development of sex organs, growth of pubic hair. Broadening of the hip region, broad shoulders, wider chests, development of muscles, growth of facial hair. Broadening of the hip region, broad shoulders, wider chests, development of muscles, growth of facial hair, acne and pimples on the face, development of sex organs, growth of pubic hair. Broad shoulders, wider chests, development of muscles, growth of facial hair, acne and pimples on face, development of sex organs, growth of pubic hair. None 4. In which process is the number of chromosomes is reduced to half? Mitosis Budding Fragmentation Meiosis None 5. Choose the correct statements about reproduction.a) Reproduction produces progeny with more or less similar features to the parents.b) Reproduction occurs by involving one parent (asexual) or two parents (sexual).c) Budding and fragmentation are the types of asexual reproduction. d) Reproduction is not observed in non-living organisms. All except III All except IV All except I All of the above None 6. Organisms in population A, have no genetic variations, and organisms of population B, have genetic variations. Based on this information, choose the correct statement. Population B is more stable than population A. Stability cannot be determined from the presence or absence of variations Population A is more stable than population B. Both population A and population B are stable. None 7. Which one of the following is not associated with reproduction? A dog giving birth to puppy. A new leaf coming out of a tree branch. Chick hatching from an egg. A seed growing into a plant. None 8. Which of the following is a post fertilization event in flowering plants? Transfer of pollen grains Formation of pollen grains Formation of flower Embryo development None 9. Pollination refers to the: Transfer of female gametes from anther to stigma. Transfer of pollen from anther to stigma. Transfer of pollen from anther to ovary. Transfer of pollen from anther to ovule. None 10. What could be the reasons for adopting contraceptive methods? To maintain the distance between two children and to plan the family size. To maintain the population size by preventing unwanted pregnancies. All of the above To prevent sexually transmitted diseases. None 11. Consider the following statements and select the option which correctly identifies true (T) and false (F) ones.(i) Ovary ripens to form seed and ovule ripens to form fruit after fertilization.(ii) Seed dispersed through water usually develop floating ability in the form of spongy or fibrous outer coat as in coconut.(iii) Pollination occurs before fertilization.(iv) Cutting, layering, grafting and tissue culture are the natural methods of vegetative propagation . (i) F (ii) T (iii) T (iv) F (i) F (ii) F (iii) T (iv) F (i) T (ii) T (iii) T (iv) F (i) F (ii) T (iii) T (iv) T None 12. Which of the following methods of preventing pregnancy, act by changing hormonal balance of the body so that eggs are not released and fertilization cannot occur? Taking oral pills Sterilization method Using Copper-T Creating a mechanical barrier None 13. Name the process in which thousands of plants can be raised within a limited time and space. Tissue culture Water Self pollination Pathernocarpy None 14. Which of the following statements are true for flowers?(i) Flowers are always bisexual.(ii) They are the sexual reproductive organs.(iii) They are produced in all groups of plants.(iv) After fertilization they give rise to fruits. (i) and (iii) (ii) and (iv) (ii) and (iii) (i) and (iv) None 15. The body breaks up into several fragments and each fragment starts to live as a new individual. This type of asexual reproduction is called: Fragmentation Binary fission Budding Regeneration None 16. The mode of reproduction that depends on the involvement of two individuals to create a new generation is called: Budding None of the above Sexual reproduction Asexual reproduction None 17. Match the pairs of types of asexual reproduction. Section-ASection-B(1) Fission(i) Spirogyra(2) Fragmentation(ii) Paramecium(3) Regeneration(iii) Mucor(4) Spore formation(iv) Planaria 1 - ii, 2 - iii, 3 - iv, 4 - i 1 - iv, 2 - iii, 3 - ii, 4 - i 1 - ii, 2 - i, 3 - iv, 4 - iii 1 - iii, 2 - iv, 3 - i, 4 - ii None 18. A narrow waistline, wide hip and oily skin are the secondary signs of puberty in: Both A and B Females Males Not gender-based None 19. Statement 1 : Unisexual flowers are either staminate flowers or pistillate flowers.Statement 2 : Both monoecious and dioecious plants have unisexual flowers. Statement 1 is correct but statement 2 is incorrect Statement 1is incorrect but statement 2 is correct Both statement 1 and 2 are correct Both statement 1 and 2 are incorrect None 20. Which one of the following methods requires two genetically variable individuals to produce the progeny? Cutting Layering Budding Goatee None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
