Students can practice the best Class 9 Science MCQ and Class 9 Science Exploration Chapter 11 MCQ Online Test with Answers Reproduction How Life Continues for exam preparation.
Class 9 Science Chapter 11 Reproduction How Life Continues MCQ
Reproduction How Life Continues MCQ
Class 9 Science Chapter 11 MCQ online test
Question 1.
Which of the following is the correct definition of reproduction?
(A) Process by which organisms obtain food
(B) Biological process by which organisms give rise to offspring similar to themselves
(C) Process of growth and development of an organism
(D) Process by which organisms respond to stimuli
Answer:
(B) Biological process by which organisms give rise to offspring similar to themselves
Question 2.
Which of the following is an example of vegetative propagation?
(A) Spore formation in Rhizopus
(B) Budding in Hydra
(C) Plantlet formation in Bryophyllum leaves
(D) Binary fission in Amoeba
Answer:
(C) Plantlet formation in Bryophyllum leaves
Question 3.
The offspring produced by asexual reproduction are called clones because they are
(A) produced from two parents
(B) genetically identical to the parent
(C) larger than the parent organism
(D) able to reproduce faster
Answer:
(B) genetically identical to the parent
Question 4.
In meiosis, a diploid parent cell produces daughter cells that are:
(A) Diploid with the same number of chromosomes
(B) Haploid with half the number of chromosomes
(C) Triploid with triple the chromosomes
(D) Identical to the parent cell
Answer:
(B) Haploid with half the number of chromosomes
Question 5.
In yeast, a small protuberance appears on the parent cell, grows and eventually pinches off to form a new cell. This mode of reproduction is called
(A) vegetative propagation
(B) budding
(C) tissue culture
(D) spore formation
Answer:
(B) budding
Question 6.
Which method of plant propagation involves burying the middle part of a twig under the soil so roots develop from it?
(A) Grafting
(B) Cutting
(C) Tissue culture
(D) Layering
Answer:
(D) Layering
Question 7.
The central cell division process behind asexual reproduction is
(A) meiosis
(B) mitosis
(C) fertilisation
(D) gametogenesis
Answer:
(B) mitosis
Question 8.
Food is stored in the refrigerator to prevent mould growth because
(A) cold temperatures kill all fungi
(B) low temperature slows or stops spore germination
(C) refrigerators provide UV light that destroys spores
(D) moisture increases inside the refrigerator
Answer:
(B) low temperature slows or stops spore germination
Question 9.
Which of the following is the correct order of floral whorls from outermost to innermost?
(A) Sepal → Stamen → Petal → Pistil
(B) Pistil → Stamen → Petal → Sepal
(C) Sepal → Petal → Stamen → Pistil
(D) Petal → Sepal → Pistil → Stamen
Answer:
(C) Sepal → Petal → Stamen → Pistil
Question 10.
The anther of a stamen contains
(A) ovules
(B) pollen grains (male gametes)
(C) female gametes
(D) seeds
Answer:
(B) The anther is a bilobed structure at the tip of the filament that contains pollen grains, which are the male gametes.
Question 11.
Which part of the pistil receives pollen grains during pollination?
(A) Ovary
(B) Style
(C) Stigma
(D) Ovule
Answer:
(C) Stigma
Question 12.
Cross-pollination differs from self-pollination in that cross-pollination
(A) occurs within the same flower
(B) does not require any external agent
(C) brings about genetic variation in offspring
(D) occurs only in wheat and rice
Answer:
(C) brings about genetic variation in offspring
Question 13.
Which of the following is the correct sequence of events of sexual reproduction in a flower?
(A) Pollination, fertilisation, seedling, embryo
(B) Seedling, embryo, fertilisation, pollination
(C) Pollination, fertilisation, embryo, seedling
(D) Embryo, seedling, pollination, fertilisation
Answer:
(C) Pollination, fertilisation, embryo, seedling
Question 14.
The diagram shown below depicts pollination. Choose the option, that will show a maximum variation in the offspring.
(A) A, B and C
(B) B and D
(C) B, C and D
(D) A and C
Answer:
(B) (B) B and D
As both B and D are showing cross-pollination, it will show maximum variation in the offspring.
Question 15.
In flowering plants, the male gamete is carried by
(A) ovule
(B) pollen grain
(C) stigma
(D) style
Answer:
(B) pollen grain
Question 16.
How many chromosomes does a human sperm ceil contain?
(A) 46
(B) 92
(C) 23
(D) 12
Answer:
(C) 23
Question 17.
Which of the following correctly describes the function of accessory glands in the male reproductive system?
(A) Produce testosterone
(B) Store and mature sperms
(C) Transport sperms to the urethra
(D) Secrete fluids to nourish, activate and lubricate sperms
Answer:
(D) Secrete fluids to nourish, activate and lubricate sperms
Question 18.
The process by which a mature egg is released from the ovary is called
(A) implantation
(B) fertilisation
(C) ovulation
(D) menstruation
Answer:
(C) ovulation
Question 19.
Fertilisation in humans usually takes place in the
(A) uterus
(B) vagina
(C) ovary
(D) fallopian tube
Answer:
(D) fallopian tube
Question 20.
In mammals, the embryo receives nourishment through the
(A) yolk sac
(B) egg shell
(C) placenta
(D) amniotic fluid
Answer:
(C) placenta
Question 21.
Menstruation occurs because
(A) the egg is fertilised
(B) the uterine lining sheds when the egg is not fertilised
(C) ovulation does not occur
(D) sperm reach the oviduct
Answer:
(B) the uterine lining sheds when the egg is not fertilised
Question 22.
Which of the following are classified as Sexually Transmitted Infections (STIs)?
(A) Malaria and Dengue
(B) Tuberculosis and Typhoid
(C) Gonorrhoea, Syphilis, and HIV/AIDS
(D) Cholera and Hepatitis A
Answer:
(C) Gonorrhoea, Syphilis, and HIV/AIDS
Question 23.
The developing offspring is called an embryo up to 8 weeks of pregnancy. After 8 weeks, it is referred to as a
(A) zygote
(B) egg
(C) Foetus
(D) embryo
Answer:
(C) Foetus
Question 24.
Frogs use external fertilisation. Which of the following is a consequence of this method?
(A) A large number of eggs are produced to compensate for low survival rate
(B) Only a few eggs are needed as survival rate is high
(C) Fertilisation is more efficient than internal fertilisation
(D) The embryo is well-protected inside the parent
Answer:
(A) A large number of eggs are produced to compensate for low survival rate
Question 25.
The menstrual cycle in females occurs approximately every 28 days. Which of the following statements about the menstrual cycle is incorrect?
(A) It involves the periodic shedding of the uterine lining.
(B) Menstrual cycle begins at puberty
(C) Menopause is the natural cessation of menstruation
(D) The menstrual cycle begins after menopause
Answer:
(D) The menstrual cycle begins after menopause
Question 26.
The male reproductive part of a flower is called
(A) pistil
(B) sepal
(C) petals
(D) stamen
Answer:
(D) stamen
Question 27.
Fertilisation in humans takes place in the
(A) uterus
(B) ovary
(C) Fallopian tube
(D) vagina
Answer:
(C) Fallopian tube
Question 28.
The process by which the embryo attaches to the uterine lining is called
(A) ovulation
(B) fertilisation
(C) parturition
(D) implantation
Answer:
(D) implantation
Question 29.
Which of the following is an example of cross-pollination?
(A) Wheat
(B) Rice
(C) Maize
(D) Pea
Answer:
(C) Maize
Reproduction How Life Continues Class 9 Assertion and Reason Questions
Direction (Question Nos. 1 – 5): The following questions consist of two statements: Assertion (A) and Reason (R). Answer the questions by selecting the appropriate option given below.
(A) Both A and R are true and R is the correct explanation of A.
(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
Question 1.
Assertion (A): Offspring produced by asexual reproduction are genetically identical to the parent.
Reason (R): Asexual reproduction does not involve the formation and fusion of gametes.
Answer:
(A) Both A and R are true and R is the correct explanation of A.
Question 2.
Assertion (A): The petals of a flower are usually brightly coloured.
Reason (R): Brightly coloured petals attract insects and other pollinators, aiding in pollination.
Answer:
(A) Both A and R are true and R is the correct explanation of A.
Question 3.
Assertion (A): Grafting is widely used to grow high-yield varieties of mango and apple.
Reason (R): In grafting, the scion provides the root system and the rootstock provides the desirable characteristics.
Answer:
(A) A is true; R is false. R can be corrected as,
In grafting, the scion provides the desirable characteristics and the rootstock provides the root system.
Question 4.
Assertion (A): Fertilisation in humans restores the diploid number of chromosomes.
Reason (R): Both the sperm and the egg are haploid cells, each carrying half the number of chromosomes.
Answer:
(A) Both A and R are true and R is the correct explanation of A.
Question 5.
Assertion (A): Cross-pollination is more beneficial than self-pollination from an evolutionary perspective.
Reason (R): Cross-pollination involves transfer of pollen within the same flower, bringing about genetic variation in offspring.
Answer:
(C) A is true, but R is false.
R can be corrected as Cross-pollination involves transfer of pollen from the anther of one plant to the stigma of a different plant of the same species, bringing about genetic variation in offspring.
Question 6.
Assertion (A): Spores of Rhizopus can survive unfavourable conditions.
Reason (R): Spores are covered by thick protective walls.
Answer:
(A) Both A and R are true and R is the correct explanation of A.
Question 7.
Assertion (A): The ovary of a flower develops into a fruit after fertilisation.
Reason (R): The ovule develops into a seed after fertilisation.
Answer:
(B) Both A and R are true, but R is not the correct explanation of A.
After fertilisation, the ovary ripens into a fruit while the ovule simultaneously develops a tough coat and becomes a seed enclosed within the fruit.