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CBSE 12th Standard Biology Subject Reproduction in Organisms Case Study Questions 2021

Published on: 21/05/2021

QB365 Provides the updated CASE Study Questions for Class 12 Biology, and also provide the detail solution for each and every case study questions . Case study questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

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Std: 12th Standard CBSE - Biology

chapter: - Case study Questions

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Questions:

Case Study Questions

5 x 4 = 20

The reproductive organs of
(i) Chara, an alga and
(ii) earthworm, an animal are sbown in tbe above diagram.
(a) Identify and name tbe male and female reproductive organs of tbese two organisms.
(b) What technical term is given to
(i) the plant, Chara and
(ii) the animal, earthworm, respectively, that possess both male and female reproductive organs in the same individual?

Many of you would be knowing that a particular plant species flowered during September - October, 2006. Its mass flowering transformed large tracts of the hilly areas of Kerala, Karnataka, and Tamil Nadu into blue stretches and attracted a large number of tourists.
(a) Write the scientific name of the plant whose flowering was responsible for this.
(b) What is unique about its flowering phenomenon?
(c) Name another plant and its unusual flowering phenomenon.

Identify the plant and the vegetative propagule ofA, Band C.

(a) Name the organism and the mode of reproduction shown in the diagram given above.
(b) Write two differences between budding and the binary fission in Amoeba.

The stages in the binary fission of Amoeba are shown above.
(a) Arrange the stages in their proper natural sequence in binary fission.
(b) How does this differ from the process of sporulation employed by Amoeba?

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Answers Key:

Case Study Questions

5 x 4 = 20

(i) A - Female organ (Oogonium)
B - Male organ (Antheridium)
(ii) C - Male organ (Testis)
D - Female organ (Ovary)
b) (i) Monoecious
(ii) HermaphroditelBisexual

(a) Strobilanthus kunthiana
(b) It flowers once in twelve years.
(c) Bamboo flowers only once in its life time, generally after 50-100 years, produces a large number of fruits (seeds) and die.

A - Agave, Bulbil
B - Bryophyl/um, Adventitious leaf buds
C - Eichhornia, Offset

(a) (i) Yeast is the organism.
(ii) It reproduces asexually by budding.
(b) Differences.

Budding	Binary fission
(i) The cell division is unequal; a large cell and a small cell, called bud, are formed.	(i) The cell division is equal and the daughter cells are almost equal in size.
(ii) The parent cell does exist.	(ii) The parent cell ceases to exist.

(a) D\(\rightarrow\)A\(\rightarrow\)C\(\rightarrow\)E\(\rightarrow\)B
(b) Differences

Binary Fission	Sporulation
(i) It occurs during favourable conditions.	(i) It occurs during unfavourable seasons
(ii) No cyst is formed	(ii) A cyst is formed.
(iii) By binary fission, only two daughter cells are formed.	(iii) By multiple fission, a number of daughter cells are formed