Reproduction in Lower and Higher Plants — BIOLOGY STD 12 Science — Question

Name any three enzymes used in industry and explain their importance.

Give the causative agent, mode of transmission and symptoms of typhoid.

A farmer while working on his farm was bitten by a poisonous snake. The workers in the farm immediately rushed him to the nearby health centre. The doctor right away gave him an injection to save his life. What did the doctor inject and why? Explain.

Name and describe any three causes of biodiversity losses.

Women are often blamed for producing female children. Consequently, they are ill treated and ostracised. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?

Give scientific : Mr. Sharma suffered from a stroke and the right side of his body was paralysed. However his response was normal for knee jerk reflex with either leg. Explain how and why?

When Morgan conducted a dihybrid cross on Drosophila like Mendel did with pea plants, the F, ratios deviated significantly from that of Mendels F, ratio. Write the explanation Morgan and his group gave for the observations they obtained from their experiments.
Or
Morgan carried out several dihybrid crosses in Drosophila and found F, ratios deviated very significantly from the expected Mendelian ratio. Explain his findings with the help of an example.

What are different types of cross pollination based on the biotic pollinating agents?

Describe characteristics of genetic code.

Write a short note on
Importance of light to plants