How do Organisms Reproduce Class 10 Science MCQ With Solutions

CBSE Class 10 Chapter 7 How do Organisms Reproduce MCQs

Q.1. In which of the following, the characters transmitted from parents to offspring are present?

(a) Cytoplasm (b) Ribosome
(c) Golgi bodies (d) Genes

Answer

(d): A gene is a unit of heredity consisting of a DNA sequence which transfer characters from parents to offspring

Q.2. The number of chromosomes in parents and offspring of a particular species remains constant due to

(a) doubling of chromosomes after zygote formation
(b) halving of chromosomes during gamete formation
(c) doubling of chromosomes after gamete formation
(d) halving of chromosomes after gamete formation

Answer

(b): Multicellular organisms have special lineages of cells. During gamete formation half number of chromosomes and half amount of DNA is transferred into the gamete. When these gametes from two individuals combine during sexual reproduction to form a new individual, it results in re-establishment of the number of chromosomes and the DNA content in the new generation. Hence, the number of chromosomes in parents and offspring of a particular species remains constant

Q.3. Length of pollen tube depends on the distance between

(a) pollen grain and upper surface of stigma
(b) pollen grain on upper surface of stigma and ovule
(c) pollen grain in anther and upper surface of stigma
(d) upper surface of stigma and lower part of style

Answer

(b): Pollen tube is a hollow tube which develops from a pollen grain. It carries the two male gametes to the ovule of a pistil. When a compatible pollen grain reaches the stigma of a pistil in a flower, it germinates and gives rise to pollen tube. The length of pollen tube, depends upon the distance between the pollen grain on upper surface of stigma and ovule.

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Q.4. A scion is grafted to a stock. The quality of fruits produced will be determined by the genotype of

(a) stock
(b) scion
(c) both stock and scion
(d) neither stock nor scion.

Answer

(b): Grafting is the technique of joining parts of two plants so as to form a composite plant. One plant has a strong root system called the stock, and the other plant having better flower or fruit yield is known as scion. When a scion is grafted to a stock the root system of the plant has the genotype of stock and fruits produced show genotypes of the scion.

Q.5. Why reproduction is essential for living organisms?

(a) It keeps the individual organism alive.
(b) It fulfills their energy requirement.
(c) It maintains growth.
(d) It continues the species generation after generation.

Answer

(d): Reproduction is a process by which living organisms are able to produce young ones of their own kind. Reproduction is essential for the existence and continuity of a species.

Q.6. Pollination between different flowers of the same plant is called

(a) autogamy (b) geitonogamy
(c) xenogamy (d) allogamy.

Answer

(b): Geitonogamy is a type of pollination in which pollen grains of one flower are transferred to the stigma of another flower belonging to either the same plant or genetically similar plant. Autogamy is a type of self pollination in which an intersexual or perfect flower is pollinated by its own pollen. Xenogamy is the transfer of pollen grains from the anther of one flower to the stigma of a genetically different flower. Xenogamy is responsible for heterozygosity. Allogamy is a type of cross pollination in flowering plants.

Q.7. An event that reflects onset of reproductive phase in human females is

(a) growth of body
(b) changes in hair pattern
(c) change in voice
(d) menstruation.

Answer

(d): The onset of reproductive phase in a girl is marked by the onset of menstrual cycle which is evident with first menstruation or menarche. Menstrual cycle generally starts between 12-15 years and continues until about 45-50 years. It is regulated by certain hormones. In a normal female, it is a 28 days cycle which involves release of egg and several changes in the reproductive part (uterus) of female (such as thickening of lining of uterus) which prepare her for pregnancy. In the absence of fertilisation, the lining of uterus breaks down and comes out with blood, mucus and unfertilised egg which is called menstruation.

Q.8. The correct sequence of organs in the male reproductive system for transport of sperms is

(a) testis → vas deferens → urethra
(b) testis → ureter → urethra
(c) testis → urethra → ureter
(d) testis → vas deferens → ureter.

Answer

(a)

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Q.9. Sertoli cells are involved in

(a) excretion (b) respiration
(c) nutrition of sperms (d) all of these

Answer

(c): Sertoli cells, also called sustentacular cells, are the functional component of seminiferous tubules. It functions as nurse cells for differentiating spermatozoa, phagocytise defective sperms and secrete inhibin hormone (which inhibits FSH secretion).

Q.10. Given below is a A B C D diagrammatic sketch of a portion of human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D.

 

 

 

 

 

(a) A-Vas deferens, B-Seminal vesicle, C-Prostate, D-Bulbourethral gland
(b) A-Vas deferens, B-Seminal vesicle, C-Bulbourethral gland, D-Prostate
(c) A-Ureter, B-Seminal vesicle, C-Prostate, D-Bulbourethral gland
(d) A-Ureter, B-Prostate, C-Seminalvesicle, D-Bulbourethral gland

Answer

 (a)

CBSE Class 10 Science How do Organisms Reproduce MCQs – PDF Download

Answers-

Summary for NCERT Class 10 Science Chapter 7 – “How do Organisms Reproduce”

• Reproduction, unlike other life processes, is not essential to maintain the life of an individual organism.
• Reproduction involves creation of a DNA copy and additional cellular apparatus by the cell involved in the process.
• Various organisms use different modes of reproduction depending on their body design.
• In fission, many bacteria and protozoa simply divide into two or more daughter cells.
• Organisms such as hydra can regenerate if they are broken into pieces. They can also give out buds which mature into new individuals.
• Roots, stems and leaves of some plants develop into new plants through vegetative propagation.
• These are examples of asexual reproduction where new generations are created from a single individual.
• Sexual reproduction involves two individuals for the creation of a new individual.
• DNA copying mechanisms creates variations which are useful for ensuring the survival of the species. Modes of sexual reproduction allow for greater variation to be generated.
• Reproduction in flowering plants involves transfer of pollen grains from the anther to the stigma which is referred to as pollination. This is followed by fertilisation.
• Changes in the body at puberty, such as increase in breast size in girls and new facial hair growth in boys, are signs of sexual maturation.
• The male reproductive system in human beings consists of testes which produce sperms, vas deferens, seminal vesicles, prostate gland, urethra and penis.
• The female reproductive system in human beings consists of ovaries, fallopian tubes, uterus and vagina.
• Sexual reproduction in human beings involves the introduction of sperm in the vagina of the female. Fertilisation occurs in the fallopian tube.
• Contraception to avoid pregnancy can be achieved by the use of condoms, oral pills, copper-T and other methods.

Best Reference Books for Class 10 Science

• NCERT Textbook + Exemplar Problems-Solutions
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• NCERT at your Fingertips Science
• 100 Percent Science
• CBSE 10 Years Chapterwise Topicwise Solved Papers AKA CBSE Champion
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