PART - 2 - Unit IV : CH - 11 Photosynthesis in Higher Plants — BIOLOGY STD 11 Science — Question

Which one of the following phylum is characterized by absence of true coelom?

1. Annelida.
2. Mollusca.
3. Echinodermata.
4. Nematoda.

Name the two types of lymphocytes and write one difference between the two.

Answer the following.

1. Name the major site where RBCs are formed.
2. Which part of heart is responsible for initiating and maintaining its rhythmic activity?
3. What is specific in the heart of crocodiles among reptilians?

Name two hormones which act on the hepatocytes.

Write the names of the bones in the forelimb (hand) of a human being. Mention the respective number of each of them.

Answer briefly:

1. How does pepsinogen change into its active form?
2. How does bile help in the digestion of fats?

Anupriya visited her biology teacher who was hospitalized for setting in artificial pacemaker procedure in her body. She felt surprised to saw those things and asked the doctor about the need for this procedure. He politely explained her that it is related to heart diseases.

1. What is a use of natural pacemaker in the body?
2. Why is SA node called the pacemaker?
3. What values reflects from Anupriya's character?

Akhil, a class XI student is very casual regarding his studies. One day, his classes were suppose to commence from 8:00 AM. But he left his home at 7:45 AM. He started running on his way, but after 400-500m, he felt a severe cramp in his leg. Due to this cramp, he had to stop and he missed his morning class.

1. What is the reason of the muscle cramp?
2. How could one get rid off the cramp?
3. Name the oxygen carrying pigment of muscles.
4. What values are displayed by Akhil?

Differentiate between animal cell and plant cell.