| Class XII |
Biology |
Biology |
10 |
is called somatic hybridisation. Imagine a situation when a protoplast of tomato is fused with that of potato, and then they are grown – to form ne... |
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| Class XII |
Biology |
Biology |
10 |
certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). B. thuringiensis forms... |
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| Class XII |
Biology |
Biology |
10 |
an infection by viruses having RNA genomes or mobile genetic elements (transposons) that replicate via an RNA intermediate. Using Agrobacterium vec... |
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| Class XII |
Biology |
Biology |
10 |
of the bacteria and make as much insulin as you need. Think about whether insulin can be orally administered to diabetic people or not. Why? Insuli... |
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| Class XII |
Biology |
Biology |
4 |
terms with example (a) Co-dominance (b) Incomplete dominance 14. What is point mutation? Give one example. 15. Who had proposed the chromosomal the... |
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| Class XII |
Biology |
Biology |
10 |
suspected AIDS patients. It is being used to detect mutations in genes in suspected cancer patients too. It is a powerful techqnique to identify ma... |
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| Class XII |
Biology |
Biology |
10 |
2026-27 BIOLOGY (iii) Biological products: Medicines required to treat certain human diseases can contain biological products, but such products ar... |
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| Class XII |
Biology |
Biology |
10 |
growing public anger that certain companies are being granted patents for products and technologies that make use of the genetic materials, plants ... |
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| Class XII |
Biology |
Biology |
10 |
nations are rich financially but poor in biodiversity and traditional knowledge. In contrast the developing and the underdeveloped world is rich in... |
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| Class XII |
Biology |
Biology |
10 |
was observed in case of similar products isolated from non-human sources. Human insulin is made in bacteria yet its structure is absolutely identic... |
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| Class XII |
Biotechnology |
Biotechnology |
12 |
assertion. (c) Assertion is true but reason is false. (d) Both assertion and reason are false. 322 BiotechnologyXII Reprint 2025-26 |
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| Class XII |
Biology |
Biology |
11 |
Diversity is not only a characteristic of living organisms but Chapter 11 Organisms and Populations alsoofcontentinbiologytextbooks.Biologyispresen... |
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| Class XII |
Biology |
Biology |
11 |
Forests (1984). Reprint 2026-27 CHAPTER 11 ORGANISMS AND POPULATIONS 11.1 Populations Our living world is fascinatingly diverse and amazingly compl... |
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| Class XII |
Biology |
Biology |
11 |
resulting from even asexual reproduction is also generally considered a population for the purpose of ecological studies. All the cormorants in a w... |
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| Class XII |
Biology |
Biology |
11 |
reflects the growth status of the population - (a) whether it is growing, (b) stable or (c) declining. Reprint 2026-27 BIOLOGY Figure 11.1 Represen... |
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| Class XII |
Biology |
Biology |
11 |
other two factors assuming importance only under special conditions. For instance, if a new habitat is just being colonised, immigration may contri... |
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| Class XII |
Biology |
Biology |
11 |
For calculating it, you need to know the birth rates and death rates. The above equation describes the exponential or geometric growth pattern of a... |
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| Class XII |
Biology |
Biology |
11 |
first square and proceeded to fill the other squares following minister’s suggested procedure, but by the time he covered half the chess board, the... |
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| Class XII |
Biology |
Biology |
11 |
more realistic one. Gather from Government Census data the population figures for India for the last 100 years, plot them and check which growth pa... |
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| Class XII |
Biology |
Biology |
13 |
world? Reprint 2026-27 BIODIVERSITY AND CONSERVATION 3. Give three hypotheses for explaining why tropics show greatest levels of species richness. ... |
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| Class XII |
Biology |
Biology |
11 |
species. They could be beneficial, detrimental or neutral (neither harm nor benefit) to one of the species or both. Assigning a ‘+’ sign for benefi... |
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| Class XII |
Biology |
Biology |
11 |
invasive and start spreading fast because the invaded land does not have its natural predators. The prickly pear cactus introduced into Australia i... |
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| Class XII |
Biology |
Biology |
11 |
the most common morphological means of defence. Many plants produce and store chemicals that make the herbivore sick when they are eaten, inhibit f... |
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| Class XII |
Biology |
Biology |
11 |
conclusive. Strong and persuasive circumstantial evidence does exist however in some cases. The Abingdon tortoise in Galapagos Islands became extin... |
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| Class XII |
Biology |
Biology |
4 |
betweentrue-breedingred-flowered(RR)andtruebreedingwhite-floweredplants(rr), theF (Rr)was pink (Figure4.6). When the F1wasself-pollinated the F2res... |
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