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12th Biology - Zoology - Reproduction in Organisms Practice Question Paper

Published on: 03/01/2020

Zoology - Reproduction in Organisms

Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

7 x 1 = 7

Pick out the organism whose fertilization occurs internally

(a)

reptiles

(b)

sponges

(c)

pisces

(d)

amphibians

"Nothing lives forever, but life continues". What does it mean?

(a)

Older dies but new ones are produced by reproduction

(b)

Nothing can produce without death

(c)

Death has nothing to do with the continuation of life

(d)

Parthenogenesis is must for sexual reproduction

Fusion of morphologically and physiologically similar gametes is called ______

(a)

anisogamy

(b)

hologamy

(c)

isogamy

(d)

merogamy

Human beings exhibit ______

(a)

Hologamy

(b)

Exogamy

(c)

Isogamy

(d)

Paedogammy

If the entire organism behaves as a gamete the Phenomenon is called _____

(a)

Autogamy

(b)

Syngamy

(c)

Morphallaxis

(d)

Hologamy

During favourable conditions ______ shows multiple fission.

(a)

Plasmodium

(b)

Amoeba

(c)

Planaria

(d)

Euglena

The mode of sexual reproduction in bacteria is by ______.

(a)

Formation of gametes

(b)

Endospore formation

(c)

Conjugation

(d)

Zoospore formation

Assertion and reason

2 x 2 = 4

Assertion: The embryos of ovoviviparous animals have no placental connection with their mothers.
Reason: Embryos receive nourishment from the egg yolk.
Codes:
A. If both A and R are true and R is correct explanation for A
B. If both A and R are true but R is not the correct explanation for A
C. If A is true but R is false
D. If both A and R are false

Assertion and reasoning questions:
In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
Assertion: Viviparous animals give better protection to their off springs.
Reason: They lay their eggs in the safe places of the environment.
Codes:
A. If both A and R are true and R is correct explanation for A
B. If both A and R are true but R is not the correct explanation for A
C. If A is true but R is false
D. If both A and R are false.

(a)

If both A and R are true and R is correct explanation for A

(b)

If both A and R are true but R is not the correct explanation for A

(c)

If A is true but R is false

(d)

If both A and R are false

Generic 3

3 x 3 = 9

10.

Give the definition for (a) Arrhenotoky (b) Thelytoky (c) Amphitoky

11.

Differentiate exogenous and endogenous budding.

12.

What is parthenogenesis? Give two examples from animals.

Generic 5

2 x 5 = 10

13.

Write notes on binary fission in animals.

14.

Give reasons for the following:
(a) Some organisms like honey bees are called parthenogenetic animals
(b) A male honey bee has 16 chromosomes where as its female has 32 chromosomes

Generic 2

5 x 2 = 10

15.

Name the four types of fission seen in animals

16.

Identify the parts marked as A, B, C, D, E and F for the below diagram.

17.

With regard to asexual reproduction. mention two phenomena seen is Hydra.

18.

Define regeneration mention the types.

19.

How is juvenile phase different from reproductive phase?

One or Two Words / Correct Statement

1 x 1 = 1

20.

(i) Lizard is a continuous breeder.
(ii) Asexual reproduction is also known as somatogenic reproduction
(iii) In repeated fission, young ones do not separate till fission process is completed.
(iv) strobilation is a kind of longitudinal fission.
(a) i and iii
(b) i, ii and iv
(c) ii and iii
(d) ii and iv

Choose the correct pair

1 x 1 = 1

21.

i. Sporogony	Paramecium
ii. Bacteria	Uniparental inheritance
iii. Amoeba	Multiple fission
iv. Birds	External fertilization

(a) i, ii and iv
(b) iii and iv
(c) ii and iv
(d) ii and iii

Find out the wrong pair

1 x 2 = 2

22.

i. Planaria	Morphallaxis
ii. Conjugation	Amoeba
iii. Autogamy	Paramecium
iv. Apolysis	sea anemones

(a) i and iii
(b) ii and iv
(c) ii and iii
(d) i, iii and iv

Odd one out

1 x 2 = 2

23.

(a) Conjugation
(b) Hologamy
(c) Paedogamy
(d) Regeneration

Answer in one word

2 x 1 = 2

24.

During multiple fission Amoebae produce ______

25.

Exogenous buds are seen in ______

Fill in the blanks

1 x 1 = 1

26.

The ploidy of males produced by arrhenotoky parthenogenesis is ________

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Answers Key:

Multiple Choice Question

7 x 1 = 7

(a)
reptiles

(a)
Older dies but new ones are produced by reproduction

(b)
Exogamy

(d)
Hologamy

(b)
Amoeba

Assertion and reason

2 x 2 = 4

A. If both A and R are true and R is correct explanation for A

D. If both A and R are false.

Generic 3

3 x 3 = 9

10.

(a) Arrhenotoky: In this type, only males are produced by parthenogenesis. eg: honey bees
(b) Thelytoky: In this type of parthenogenesis only females are produced by parthenogenesis. e.g: Solenobia
(c) Amphitoky: In this type parthenogenetic egg may develop into individuals of any sex. e.g: Aphis.

11.

Exogenous budding	Endogenous Budding
Buds are formed on the outer surface of the parent body	Buds are formed inside the cytoplasm within the body of the parent
E.g. Hydra	E.g. Noctiluca

12.

1. In Greek Parthenos means Virgin, Genesis means Produce.
2. Development of a haploid (n) egg into a complete individual without fertilization is known as parthenogenesis.
3. It was first discovered by Charles Bonnet in 1745.
4. Parthenogenesis occurs naturally in some invertebrates (e,g:) Nematodes, Water fleas, Scorpians, Parasitic (wasps).

Generic 5

2 x 5 = 10

13.

In binary fission, the parent organism divides into two halves and each half forms a daughter individual. The nucleus divides first amitotically or mitotically (karyokinesis), followed by the division of the cytoplasm (cytokinesis). The resultant offsprings are genetically identical to the parent. Depending on the plane of fission, binary fission is of the following types
(i) Simple irregular binary fission
(ii) Transverse binary fission
(iii) Longitudinal binary fission
(iv) Oblique binary fission
(i) Simple irregular binary fission is seen in Amoeba like irregular shaped organisms, where the plane of division is hard to observe. The contractile vacuoles cease to function and disappear. The nucleoli disintegrate and the nucleus divides mitotically. The cell then constricts in the middle, so the cytoplasm divides and forms two daughter cells.

(ii) In Transverse binary fission, the plane of the division runs along the transverse axis of the individual. E.g. Paramecium and Planaria. In Paramecium the macronucleus divides by amitosis and the micronucleus divides by mitosis.

(iii) In Longitudinal binary fission the nucleus and the cytoplasm divides in the longitudinal axis of the organism. In flagellates, the flagellum is retained usually by one daughter cell. The basal granule is divided into two and the new basal granule forms a flagellum in the other daughter individual. E.g. Vorticella and Euglena.
(iv) In Oblique binary fission the plane of division is oblique. It is seen in dinoflagellates. E.g. Ceratium.

14.

(a) Some organisms like honeybees are called parthenogenetic animals.
1. In case of honeybees both haploid and diploid individuals formed, as a result of incomplete parthenogenesis.
2. Both sexual reproduction and parthenogenesis are inclusive.
3. Fertilized eggs (zygote) give rise to queen and workers (both are females) by the process of sexual reproduction.
4. Unfertilized eggs (ova) of females develop into drones (males) by the process of parthenogenesis.
(b) A male honeybee has 16 chromosomes where as its female has 32 chromosomes
1. It is because of haplodiploidy which is a sex determination system, in which males develop from unfertilized eggs (parthenogenesis) and are haploid (16n) and females develop frorn fertilized eggs and are diploid (32n) (sexual reproduction).
2. As unfertilized egg carries only half number of chromosome as compared to fertilized egg.
Therefore male honeybees have 16 chromosomes where as female has 32 chromosomes.

Generic 2

5 x 2 = 10

15.

Binary fission, Multiple fission, Sporulation and Strobilation

16.

A - Chromosomes
B - Nucleoli
C - Nucleus
D - Longitudinal furrow
E - Nuclear constriction
F - Daughter Euglena

17.

Budding and Regeneration.

18.

(i) Regeneration is regrowth in the injured region.
(ii) Regeneration is of two types
(a) morphallaxis
(b) epimorphosis.

19.

juvenile phase	reproductive phase
lt is also known as young and Vegetative Phase	It is also known as Maturity adult Phase
lt is the period of growth between the birth of the individual upto reproductive maturitiy.	The organisms reproduce and their offsprings reach maturity period