SSLC (English Medium) कक्षा १० - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Mark the correct choice as

1. Assertion: Sound travels faster in solids than in gases.
2. Reason: Solid posses a greater density than that of gases.

What are the factors that affect the speed of sound in gases?

What do you understand by the term ‘ultrasonic vibration’?

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

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 ______.

______ is the chemical used for doubling the chromosomes.

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

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.

In vitro fertilisation means the fertilisation done inside the body.

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.

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.

State the importance of biofertiliser.

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

Describe mutation breeding with an example.