Board Paper Practice
Category: NCERT
Why don’t purelines exhibit genetic variation for natural selection to act?
Purelines appear due to continuous inbreeding or self that makes the similarity in gene pairs. Thus, variations in pure lines are only environmental & Read More …
What are pleotropic genes?
Gene with multiple effect.
Mention the advantages of selecting Pea plant for the experiments by Mendel ?
The advantages of selecting Pea plant for the experiments by Mendel are: Pea plants have a short life cycle. They are easy to grow Read More …
Life processes. Q bank
Fill in the blanks: ————— is a fluid connective tissue. ———— is the filtration unit of kidney. An example of anaerobic respiration is ————- Read More …
Describe in detail the structure of DNA polynucleotide chain.
A nucleotide has three components – a nitrogenous base, a pentose sugar deoxyribose , and a phosphate group. There are two types of nitrogenous Read More …
Discuss the origin and evolution of Man.
Name 1st appeared characteristics Brain capacity place diet Dryopithecus & Ramapithecus 15 million years ago (MYA) Hairy, Ape like gait Ramapithecus more Read More …
Describe the role of Restriction enzymes in Biotechnology?
Restriction enzymes cut DNA molecules at a particular point by recognising a specific sequence . They are of two kinds – Exonucleases – remove Read More …
Name two core techniques that helped develop biotechnology.
i) Genetic engineering : Techniques to alter the chemistry of genetic material & to introduce these into host organisms and thus change the phenotype of Read More …
Explain surgical methods and IUD’s are used in controlling human population.
Surgical method or sterilisation is a terminal method to prevent any more pregnancies. Surgical intervention blocks gamete transfer so as to prevent conception. In males it is called ‘vasectomy’, Read More …
You must be logged in to post a comment.