Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

What is Segmentation? How many types are there? Explain each with an example.

The diagram below represents the changes in the number of chromosomes during several Sun processes that occur in an animal cell.

1. Name the process of cell division occurring at X and Y.
2. State two differences in the behaviour of chromosomes between X and Y.

 

3CO₂ + 9ATP + 6NADPH + Water →
Glyceraldehyde, 3-phosphate + 9ADP + 6 NADP + 6 P_i. Analyse the above reaction and answer the following questions.

1. How many molecules of ATP and NADPH are required to fix one molecule of CO₂?
2. Where in the chloroplast does this process occur?

Describe the structure of the human skull.

Write few lines about growth curve?

How does parathyroid hormone influences calcium uptake in the body?

Write short note on organ of corti.

Which one of the following statements is incorrect?

1. In cockroaches and prawns excretion of waste material occurs through malpighian tubules.
2. In ctenophores, locomotion is mediated by comb plates.
3. In Fasciola, flame cells help in excretion.
4. Earthworms are hermaphrodites and yet cross fertilization take place among them.

Excretion is an important process as it helps in getting rid of waste from the body. Which of these is similar to this fact? What is the importance of maintaining cleanliness at public places?

1. Cleaning our home is necessary to create a healthy place for living.
2. Garbage should be thrown out every day.
3. Garbage dumping sites should be far away from the city limits.

Indicate the flow of blood in the heart during joint diastole. State whether the semilunar valves are open or closed during this phase.