Human Reproduction — BIOLOGY STD 12 Science — Question

Is nervous tissue without lymphatic vessels?

Bee keeping practice is a good income generating industry. Write the different points to be kept in mind for successful bee keeping. Write the scientific name of the most common Indian species used for the purpose.

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

Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life.

Define Parthenogenesis. Give two examples.

To which category of cells do B-cells and T-cells belong? How do they differ from each other with reference to their formation and response to antigens?

Explain in brief the mechanism of antibody - antigen complex formation with a neat, labelled diagram.

What is the ecological process behind the biological control method of managing with pest insects?

What is transpiration? Explain role of transpiration.

According to the 10% law given by Lindeman, only 10% of the energy is transferred to the next trophic level.

1. Name the process by which an organism produces energy.
2. What is the most common substrate used in this pathway?
3. Which biomolecule is also known as energy currency of the cell?