Reproductive Health — BIOLOGY STD 12 Science — Question

A person has inhaled air having particulate pollutants of size less than 2.5 micrometers in diameter. What could be the impact of their pollutants on his respiratory system?

What is acrosome?

How do cellular barriers and cytokine barriers provide innate immunity in humans?

1. Select the homologous structures from the combinations given below:

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

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

Name the following:

1. The vector of dengue fever.
2. A vaccine produced by recombinant DNA technology.
3. The type of immunity that is present at the time of birth.
4. A fish that helps in eradication of mosquito larvae.

A true breeding tall plant is crossed with a true breeding dwarf plant. F, progeny is 100% tall and F, has tall : dwarf in the ratio 3 : 1.

1. Explain why F, shows only one type of parental phenotype.
2. Name the patterns of inheritance in which the ratio deviates from above. Also mention the deviated phenotypic ratio.

Describe convergent evolution, taking an example from plants.
OR
Convergent evolution leads to analogous structures. Explain with the help of an example.

Differentiate between predators and parasites.

If abiotic origin of life is in progress on a planet other than earth, what should be the condition there? Explain.

Who was the first to map chromosomes? What formed the basis for it?