Cell The Unit of Life — BIOLOGY STD 11 Science — Question

A frogs tadpole becomes ammonotelic, while the adult frog becomes ureotelic. Why?

When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?

1. Name the pigment found in the root nodules of legumes.
2. How does this pigment protect the enzyme nitrogenase?

OR
Which substance imparts pink colour to the root nodules of leguminous plants? State its function.

During the group study at Vishalthi's home, Anil got a severe pain in his stomach. Vishakha called her mother immediately as she (mother) was a doctor. After diagnosis, stone is found in her kidney. She gave him some medicines and also suggested to drink a lot of water, so that the stone related problem does not arise again.

1. What is the medical term used for the stone in kidney?
2. Way should we drink a lot of water on the regular basis?
3. Name the ions which are involved in the formation of renal stones?
4. What values did vishakha’s mother possess?

What will be the effect if the meninges are removed from the brain?

Cut pieces of beetroot do not leave colour in cold water but do so in hot water. Explain.

Earthworms are bisexual, still the self-fertilisation is not possible in them. Explain.

Explain Blackman's law of limiting factors. Explain it with the help of a suitable example.

Write the name of the acids formed in the Krebs' cycle. Draw a labelled diagram of ATP synthesis in mitochondria.

Write a short note on the following: (1) Climactic respiration (2) Bakanae (Foolish Seedling).