Evolution — BIOLOGY STD 12 Science — Question

If one induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why?

find out how to distinguish between: Exonuclease and endonuclease

Why are the tumour cells dangerous?

Explain 'standing crop' in an ecosystem. Draw a pyramid of biomass, where a small standing crop of phytoplanktons supports a large standing crop of zooplanktons in the sea.

Give two reasons why both the strands of DNA are not copied during transcription.

Select the analogous structures from the combinations given below:

1. Forelimbs of whales and bats
2. Eyes of octopus and mammals
3. Tuber of sweet potato and potato
4. Thorns of Bougainvillea and tendrils of Cucurbita

2. ​​​​​​​State the kind of evolution they represent.

a. A patient had suffered myocardial infarction and clots were found in his blood vessels. Name a clot buster that can be used to dissolve the clots and the micro-organism from which it is obtained.
b. A woman had just undergone a kidney transplant. A bioactive molecular drug is administered to oppose kidney rejection by the body. What is the bioactive molecule? Name the microbe from which this is extracted.
c. What do doctors prescribe to lower the blood cholesterol level in patients with high blood cholesterol? Name the source organism from which this drug can be obtained.

Explain the advantages of using genetically modified plants.

Write the normal body temperature of humans. How is it maintained during summers?

Make a chart (with diagrammatic representation) showing restriction enzyme, the substrate DNA on which it acts on, the site at which it cuts DNA the product.