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12th Standard Botany - Plant Breeding 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.

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Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

10 x 1 = 10

Intraspecific hybridization is also termed as __________

(a)

Intravarietal hybridization

(b)

Intervarietal hybridization

(c)

Interspecific hybridization

(d)

Intergeneric hybridization

Assertion (A): Hybrids show increased growth and elevated yield.
Reason (R): F1 hybrids show Heterosis.

(a)

Both A and R are true. R explains A.

(b)

A is true R is false

(c)

A is false R is true

(d)

Both A and R are false

Arbuscular mycorrhizae is a symbiotic association between ____________

(a)

Algae and fungi

(b)

Angiosperm roots and fungi

(c)

Blue-green algae and Azolla fern

(d)

Cyanobacteria and coralloid root

Identify the incorrect statement:

(a)

Bio-inoculants are efficient in solubilising phosphate

(b)

Bio-inoculants are ecofriendly organic agro outputs

(c)

Bio-inoculants are obtained from dead organic matters

(d)

Bio-inoculants are designed to improve soil fertility

________is the process of bringing a plant species under human control.

(a)

Emasculation

(b)

Hybridization

(c)

Domestication

(d)

Acclimatization

A wheat variety, Atlas 66 which has been used as a donor for improving cultivated wheat, which is rich in ______.

(a)

iron

(b)

carbohydrates

(c)

proteins

(d)

vitamins

Dwarfing gene of wheat is ______.

(a)

pal 1

(b)

Atomita 1

(c)

Norin 10

(d)

pelita 2

Plants having similar genotypes produced by plant breeding are called _____.

(a)

clone

(b)

haploid

(c)

autopolyploid

(d)

genome

The quickest method of plant breeding is _______.

(a)

Introduction

(b)

Selection

(c)

Hybridization

(d)

Mutation breeding

10.

Assertion(A): Genetic variation provides the raw material for selection
Reason(R): Genetic variations are differences in genotypes of the individuals.

(a)

Assertion is right and reason is wrong.

(b)

Assertion is wrong and reason is right

(c)

Both reason and assertion is right.

(d)

Both reason and assertion is wrong.