CBSE Questions for Class 12 Medical Biology Reproduction In Organisms Quiz 8 - MCQExams.com

Select the wrong statement :
  • Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.
  • Isogametes are similar in structure, function and behaviour.
  • Anisogametes differ either in structure, function or behaciour.
  • In oomycetes, female gamete is smaller and motile while male gamete is larger and non-motile.
Which of the following cannot be seen during estrus cycle?
  • Estrogen produces strong sex surge
  • Menstruation at the end of the estrous cycle
  • Ovulation takes place during estrus phase
  • None of the above
State whether the following statements are true or false, Frogs are not capable of internal fertilisation
  • True
  • False
In oogamous reproduction,
  • Both male and female gametes are motile
  • Both gametes are product of division of protoplast
  • Both male and female gametes are non-motile
  • For male gametes protoplast divides but for female gamete it does not
Fusion between a larger non-motile (static) female gamete and smaller motile male gamete is
  • Isogamous
  • Oogamous
  • Anisogamous
  • Homogamous
Regeneration occurs in which of the following organisms?
  • Planaria
  • Hydra
  • Saccharomyces
  • Both A and B 
Which one of the following methods requires two genetically variable individuals to produce the progeny?
  • Cutting
  • Layering
  • Budding
  • Goatee
A difference between estrous and menstrual cycles is that
  • Non-mammalian vertebrates have estrous cycles, whereas mammals have menstrual cycles
  • The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles
  • Estrous cycles occur more frequently than menstrual cycles do
  • Ovulation occurs before the endometrium thickens in estrous cycles
Fusion of two gametes which are dissimilar in size is termed as
  • Oogamy
  • Isogamy
  • Anisogamy
  • Both A and C
Which of the following characterizes parthenogenesis?
  • An individual may change its sex during its lifetime
  • Specialized groups of cells may be released and grow into new individuals
  • An egg develops without being fertilized
  • Both members of a mating pair have male and female reproductive organs
Choose the correct answers from the alternatives given.
The principal embryonic membranes are
  • Chorion and umbilicus
  • Amnion and placenta
  • Amnion and chorion
  • Placenta and umbilicus
In maize, a meiocyte has $$20$$ chromosomes. What will be the number of chromosomes in its somatic cell?
  • $$40$$
  • $$30$$
  • $$20$$
  • $$10$$
Which of the following options show two plants in which new plantlets arise from the same organ?
  • Dahlia and ginger
  • Potato and sweet potato
  • Dahlia and rose
  • Potato and sugarcane
The limited period of sexual receptivity that occur around the time of ovulation in all female mammals, except human, is called

  • Oogenesis
  • Menstruation
  • Estrus
  • Puberty
Name the process in which thousands of plants can be raised within a limited time and space.
  • Pathernocarpy
  • Self pollination
  • Tissue culture
  • Water
Choose the correct statements from the options below with regard to sexual reproduction in plants.
(i) Sexual reproduction does not always require two individuals.
(ii) Sexual reproduction generally involves gametic fusion.
(iii) Meiosis never occurs during sexual reproduction.
(iv) External fertilization is a rule during sexual reproduction.

  • (i) and (iv)
  • (i) and (ii)
  • (ii) and (iii)
  • (ii) and (iv)
A phenomenon is termed as parthenogenesis when 
  • Artificial fertilization occurs
  • Egg is fertilized by a sperm
  • Egg undergoes cleavage without fertilization
  • Sperm dies before fertilization
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil.
(ii) They possess either stamen or pistil.
(iii) They exhibit cross pollination.
(iv) Unisexual flowers possessing only stamens cannot produce fruits.
  • (i) and (iv)
  • (ii), (iii) and (iv)
  • (iii) and (iv)
  • (i), (iii) and (iv)
The following graph shows the levels of pituitary hormones during a menstrual cycle. What do 1 and 2 represent?
1392422_e079bf6b29414537857f2985fc2b64e5.PNG
  • 1-LH, 2-FSH
  • 1- Estrogen, 2-Progesterone
  • 1-FSH, 2-LH
  • 1-Progesterone, 2-Estrogen
Bryophyllum reproduces vegetatively through _________.
  • Leaf
  • Root
  • Stem
  • Flower
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