Biological Classification — BIOLOGY STD 11 Science — Question

Which important functions the muscle tissue carry out in the body?

Provide the scientific term for the following:

1. The flat and expended portion of a leaf.
2. The roots which come above the surface of soil LEE to absorb air.
3. The sepals which are united.
4. The roots which arise from parts of the plant other than the radicle.

Differentiate between thalamus and hypothalamus.

Answer the following:

1. Name the excretory organs of cockroach.
2. Where are these located?
3. What is their function?
4. Which other excretory organs also help in excretion?

Write any four characteristics of Pteridophytes.

What is the role of second messenger in protein hormone action?

Differentiate between monocytes and eosinophils.

How does temperature and pH affect activity of enzyme?

Rahul's father bought an aquarium to home, while looking at the fishes, Rahul wondered that fishes, though small, can breathe efficiently in water. He wondered why do humans die of drowning. Next day, he asked his biology teacher about the same. The teacher explained that fishes have special respiratory organ, which allow them to breathe inside water. Rahul was amazed to know that even respiratory organs differ in different animal groups.

1. Give the name of the respiratory organ of fishes.
2. How do humans swim and breathe inside water?
3. Give the name of the respiratory organ of humans.
4. What values are displayed by Rahul?

 Name two hormones which act on the hepatocytes.