Biomolecules — BIOLOGY STD 11 Science — Question

Compare the following: Central neural system (CNS) and Peripheral neural system (PNS)

Where are calcium ions stored in a muscle fibre? How do calcium ions affect the process of muscle contraction?OR
Bring out the role of calcium ions and ATP in muscle contraction.

Name:

1. The receiving chambers.
2. The pumping chambers of heart.

Write any two energy yielding reactions of glycolysis.

A sample of urine was diagnosed to contain high content of glucose and ketone bodies. Based on this observation, answer the following:

1. Which endocrine gland and hormone is related to this condition?
2. Name the cells on which this hormone acts.
3. What is the condition called and how can it be rectified?

Differentiate between Apoplast and Symplast pathways of water movement. Which of these would need active transport?

Discuss briefly the role of nucleolus in the cells actively involved in protein synthesis.

Distinguish between male frog and female frog.

All the organ systems work in perfect harmony and thus all the life processes continue. This is similar to which of the following? How can taking care of the digestive system help us in maintaining a healthy body?

1. All the musical instruments play in perfect harmony and thus the wonderful music is created.
2. All the players in a team play to their ability and thus the team wins.
3. You should be good at quantitative, linguistic and reasoning skills to excel in your studies.

Differentiate between eyes of cockroach and eyes of frog.