Every Book Back multiple-choice question from Breeding and Biotechnology (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Which method of crop improvement can be practised by a farmer if he is inexperienced?
- A. clonal selection
- B. mass selectionCorrect
- C. pureline selection
- D. hybridisation
Explanation. Mass selection simply keeps back seed from the best looking plants of a mixed population. It needs no specialised skill, unlike clonal or pureline selection and hybridisation.
Q2
Pusa Komal is a disease resistant variety of __________ .
- A. sugarcane
- B. rice
- C. cow peaCorrect
- D. maize
Explanation. Pusa Komal is the disease resistant variety of cow pea developed through breeding for resistance. The name is one of the fixed facts the chapter expects to be recalled.
Q3
Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a variety of ___________ .
- A. chilli
- B. maize
- C. sugarcane
- D. wheatCorrect
Explanation. Himgiri is a wheat variety developed by hybridisation and selection to resist rust pathogens. Rust is a characteristic disease of wheat, which supports the answer.
Q4
The miracle rice which saved millions of lives and celebrated its 50th birthday is _______
- A. IR 8Correct
- B. IR 24
- C. Atomita 2
- D. Ponni
Explanation. IR 8 is the high yielding variety known as miracle rice. Its introduction greatly raised rice production and is credited with saving millions from famine.
Q5
Which of the following is used to produce products useful to humans by biotechnology techniques?
- A. enzyme from organism
- B. live organism
- C. vitamins
- D. both (a) and (b)Correct
Explanation. Biotechnology uses living organisms and also enzymes obtained from them to make products useful to human beings, so both of the first two options apply.
Q6
We can cut the DNA with the help of
- A. scissors
- B. restriction endonucleasesCorrect
- C. knife
- D. RNAase
Explanation. Restriction endonucleases are the molecular scissors of genetic engineering. They cut DNA at specific recognition sites, which is what makes recombinant DNA possible.
Q7
rDNA is a
- A. vector DNA
- B. circular DNA
- C. recombinant of vector DNA and desired DNACorrect
- D. satellite DNA
Explanation. Recombinant DNA is formed by joining the desired gene to a vector DNA. Neither component alone is rDNA; it is the combination of the two.
Q8
DNA fingerprinting is based on the principle of identifying --------------- sequences of DNA
- A. single stranded
- B. mutated
- C. polymorphic
- D. repetitiveCorrect
Explanation. The technique compares variable number tandem repeats, which are repetitive sequences also known as satellite DNA. Their number differs from one individual to another.
Q9
Organisms with modified endogenous gene or a foregin gene are also known as
- A. transgenic organsims
- B. genetically modified
- C. mutated
- D. both a and bCorrect
Explanation. An organism carrying a modified own gene or an introduced foreign gene is called transgenic, and is equally described as genetically modified, so both terms apply.
About these Breeding and Biotechnology questions
These are the Book Back multiple-choice questions for Breeding and Biotechnology from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Breeding and Biotechnology?
This chapter has 9 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Breeding and Biotechnology book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
