Class 12 Biology 2019 Board Exam

Mosses and frogs both need water as a medium for fertilisation. Where does syngamy occur and how is it ensured in both these organisms?
[Max Marks: 2 | Set: 57/2/1 | VI Students]

When and where do tapetum and synergids develop in flowering plants? Mention their functions.
[Max Marks: 3 | Set: 57/2/1 | VI Students]

Where are the following structures present in a male gametophyte of an angiosperm? Mention the function of each one of them.

Draw L.S. of an embryo of grass and label its parts.
[Max Marks: 3 | Set: 57/2/1 | VI Students]

"For a common man both mango and strawberry are fruits, but not for a biology student. Justify.
[Max Marks: 2 | Set: 57/2/2 | VI Students]

Name a distinguishing structure seen in a mature black pepper seed and not in a pea seed. State how does it develop.
[Max Marks: 2 | Set: 57/2/3 | VI Students]

At what stage does the meiosis occur in an organism exhibiting haploidic life cycle and mention the fate of the products thus produced.
[Max Marks: 1 | Set: 57/1/1]

You are conducting artificial hybridization on papaya and potato. Which one of them would require the step of emasculation and why? However for both you will use the process of bagging. Justify giving one reason.
[Max Marks: 2 | Set: 57/1/1]

Pollen banks are playing a very important role in promoting plant breeding programme the world over. How are pollens preserved in the pollen banks? Explain. How are such banks benefitting our farmer? Write any two ways.
[Max Marks: 3 | Set: 57/1/1]