DEAR STUDENTS THE CHAPTER FOR STUDY FOR MAY MONTH: REPRODUCTION IN ORGANISMS CHAPTER-I
PLEASE READ THE CHAPTER AND SEE THE RELATED VIDEOS GIVEN HERE UNDER. THEN ANSWER THE QUESTIONS GIVEN.
FURTHER FOR CBSE 12 TH BIOLOGY PRACTICALS PREPARE A PROJECT AS DONE BY YOU EARLIER IN 11 TH CLASS. PLEASE COMPLETE THE WORK ALLOTTED FOR YOU. AS THE INTERNAL MARKS DEPEND ON THESE ASSIGNMENTS.
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Q.1. What are the two inherent characteristics of amoeba and
yeast that favour asexual reproduction in them?
Q.2. “The offsprings produced by asexual reproduction are
referred to as clones”. Why?
Q.3. Why is potato tuber considered as a stem though it is
an underground part? Give two reasons in support of your answer?
Q.4. Among the annual and the perennial plants, which one
has a shorter juvenile period. Explain.
Q.5. Rearrange the following events in the sequence in which
they occur in the sexual reproduction of flowering plants: embryogenesis,
fertilization, gametogenesis, pollination.
Q.6. How is it that the chances of fruit set in a
self-pollinated bisexual flower of a plant are far greater than a dioecious
plant?
Q.7. Is sexual reproduction hindered by the presence of a
large number of chromosomes in an organism?
Q.8. Explain giving two examples if there is a relationship
between the size and the lifespan of an organism.
Q.9. There are two different types of flowers marked A and B
in the image given below. Identify the flower types and the kind of pollination
that will occur in each of them. Q.10. Why can’t multicellular organisms reproduce by cell division?
Q.11. Mark the ovule and the pericarp in the figure given
below. Q.12. Why is it so that the gametes produced in the organisms in large
numbers exhibit external fertilization?
Q.13. Identify
the monoecious and dioecious organisms.
Earthworm
Chara
Marchantia
Cockroach
Q.14. Match
the following:
Column A
Column B
Bryophyllum
Offset
Agave
Eyes
Potato
Leaf Buds
Water hyacinth
Bulbils
Q.15. Post-fertilization, what do the following parts of the
flower grow into?
Ovary
Ovules
Short
Answer Type Questions
Q.1. Name the stage in the life-cycle during meiosis in the
haploid organisms that undergo sexual reproduction. Give reasons as well.
Q.2. In higher plants and higher animals, the number of taxa
exhibiting asexual reproduction is drastically reduced as compared to the lower
groups of plants and animals. Explain.
Q.3. Name the haploid and diploid individuals in the family
of honey bees and analyze the reasons behind their formation.
Q.4. Which type of reproduction is a reduction division
associated with? Give reasons in support of your answer.
Q.5. Is vegetative propagation considered a type of asexual
reproduction? Give reasons.
Q.6. Why is fertilization not a compulsory event for the
production of fruits in certain plants?
Q.7. What will be the consequences if cell division is not
followed by cell differentiation in a developing embryo?
Q.8. What are the changes that take place in an angiosperm
after pollination and fertilization have occurred?
Q.9. Why are the seeds scattered in the juicy pulp of tomato
and arranged in a row in a pea pod?
Q.10. Mention two differences and one similarity between
zoospore and conidium. Draw diagrams of each.
Q.11.What is Embryogenesis?
Q.12.What is Fragmentation?
Q.13.What is vegetative propagation?
Q.14.What is Sexual Reproduction?
Q.15.What is Gametogenesis?
Q.16.What is a bisexual flower?
Q.17.What is Asexual Reproduction?
Q.18.What are the different types of asexual reproduction
Q.19.What is the complete process of sexual reproduction?
Q.20.Define Pollination?
Long
Answer Type Questions
Q.1. State the differences between sexual and asexual
reproduction. Explain different types of asexual reproduction in unicellular
organisms.
Q.2. Explain the process of gametogenesis in animals with
suitable examples.
Q.3. State the differences between:
Oestrous and menstrual cycle
Ovipary and vivipary
Q.4. Rose plants have large flowers but rarely do they
produce fruits. On the contrary, the tomato plant produces fruit but has very
small flowers. Comment with suitable reasons.
Q.5. List the important differences between zoospore and
zygote.
Q.6. What are the post-fertilization changes that occur in
plants?
