Samacheer Kalvi solutions for Science [English] Class 10 SSLC TN Board chapter 20 - Breeding and Biotechnology [Latest edition]

Which method of crop improvement can be practised by a farmer if he is inexperienced?

Pusa Komal is a disease resistant variety of ______.

Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a variety of ______.

The miracle rice which saved millions of lives and celebrated its 50th birthday is______.

Which of the following is used to produce products useful to humans by biotechnology techniques?

We can cut the DNA with the help of______.

rDNA is a ______.

DNA fingerprinting is based on the principle of identifying______.

Organisms with modified endogenous gene or a foregin gene are also known as______.

In a hexaploid wheat( 2n = 6 x = 42 ) the haploid (n) and the basic(x) number of chromosomes respectively are ______.

Economically important crop plants with superior quality are raised by ______.

A protein rich wheat variety is ______.

______ is the chemical used for doubling the chromosomes.

The scientific process which produces crop plants enriched with desirable nutrients is called ______.

Rice normally grows well in alluvial soil, but ______ is a rice variety produced by mutation breeding that grows well in saline soil.

______ technique made it possible to genetically engineer living organism.

Restriction endonucleases cut the DNA molecule at specific positions known as ______.

Similar DNA fingerprinting is obtained for______.

______ cells are undifferentiated mass of cells.

In gene cloning the DNA of interest is integrated in a ______.

Raphano brassica is a man-made tetraploid produced by colchicine treatment.

The process of producing an organism with more than two sets of chromosome is called mutation.

A group of plants produced from a single plant through vegetative or asexual reproduction are called a pureline.

Iron fortified rice variety determines the protein quality of the cultivated plant

Golden rice is a hybrid.

Bt gene from bacteria can kill insects.

In vitro fertilisation means the fertilisation done inside the body.

DNA fingerprinting technique was developed by Alec Jeffrey

Molecular scissors refers to DNA ligases.

Match the following

Assertion: Hybrid is superior than either of its parentsReason: Hybrid vigour is lost upon inbreeding.

Assertion: Colchicine reduces the chromosome number.

Reason: It promotes the movement of sister chromatids to the opposite poles.

Assertion: rDNA is superior over hybridisation techniques.

Reason: Desired genes are inserted without introducing the undesriable genes in target organisms.

Give the name of wheat variety having higher dietary fibre and protein.

Semi-dwarf varieties were introduced in rice. This was made possible by the presence of dwarfing gene in rice. Name this dwarfing gene.

Define genetic engineering.

Name the types of stem cells

What are transgenic organisms?

State the importance of biofertiliser.

Discuss the method of breeding for disease resistance.

Name three improved characteristics of wheat that helped India to achieve high productivity

Name two maize hybrids rich in amino acid lysine

Distinguish between

somatic gene therapy and germ line gene therapy

Distinguish between

undifferentiated cells and differentiated cells

State the applications of DNA fingerprinting technique.

How are stem cells useful in regenerative process?

Differentiate between outbreeding and inbreeding.

What are the effects of hybrid vigour in animals.

Describe mutation breeding with an example.

Biofortification may help in removing hidden hunger. How?

With a neat labelled diagram explain the techniques involved in gene cloning.

Discuss the importance of biotechnology in the field of medicine.

Higher Order Thinking Skill (HOT)

A breeder wishes to incorporate desirable characters into the crop plants. Prepare a list of characters he will incorporate

Higher Order Thinking Skill (HOT)

Organic farming is better than Green Revolution. Give reasons

Higher Order Thinking Skill (HOT)

Polyploids are characterised by gigantism. Justify your answer.

Higher Order Thinking Skill (HOT)

‘P’ is a gene required for the synthesis of vitamin A. It is integrated with genome of ‘Q’ to produce genetically modified plant ‘R’.

1. What is P, Q and R?
2. State the importance of ‘R’ in India.