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12th Standard Zoology - Reproduction in Organisms English Medium Free Online Test One Mark Questions 2020 - 2021

Published on: 05/11/2020

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.

Questions + Answers key

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QB365 Student Learing Managemnet System

Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

9 x 1 = 9

This is a method of sexual reproduction in which individuals of the same species temporarily write and exchange certain. amount of nuclear material and then get separated.

(a)

Syngamy

(b)

Conjugation

(c)

Parthenogenesis

(d)

Paedogenesis

Paedogenetic parthenogenesis occurs in: ______

(a)

Gall fly

(b)

Honey bees

(c)

Aphis

(d)

Solenobia

Isogamy is observed in ______

(a)

Monocystis

(b)

Mammals

(c)

Trichonympha

(d)

Reptiles

Conjugation is a type of ______

(a)

Asexual reproduction

(b)

Autogamy

(c)

External fertilization

(d)

Sexual reproduction

Gemmules are ______

(a)

Exogenous growth

(b)

Daughter nuclei

(c)

Internal buds

(d)

Regenerated parts

Plasmotomy is observed in ________

(a)

Giant Amoeba

(b)

Hydra

(c)

Plasmodium

(d)

Ceratium

Multiple fission is seen in _______

(a)

Vorticella and ceratium

(b)

Plasmodium and paramecium

(c)

Amoeba and cyanobacteria

(d)

Vorticella and plasmodium

The mode of sexual reproduction in bacteria is by ______.

(a)

Formation of gametes

(b)

Endospore formation

(c)

Conjugation

(d)

Zoospore formation

In which type of parthenogenesis are only males produced?

(a)

Arrhenotoky

(b)

Thelytoky

(c)

Amphitoky

(d)

Both a and b

Assertion and reason

1 x 2 = 2

10.

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