Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Write the names of any two hormones secreted through the gastro-intestinal pathway.

Why do cells need a constant supply of oxygen?

Define the following terms?
Asthma.

What are Nissl's granules?

Does moonlight support photosynthesis? Find out.

Name the sexual spores produced by the sac fungi. Name the structure in which they are formed.

Vinay was going through an industrial area with his grandfather. While on the way, he felt suffocated and dizzy due to the smoke coming out of the factory. Vinay got angry and started shouting that all these factories should be closed. His grandfather calms him down and explained that it is due to large scale cutting of trees for urbanization and industrialization which has disturbed the balance of atmospheric gases. He also explained various economic importance of plants.

1. Large scale cutting of trees leads to ___________________?
2. What initiatives should be taken to maintain the atmospheric balance.
3. Give various economic importance of plants.
4. What values are shown by his grandfather?

What is the smallest functional unit of the lungs called?

What are the plant organs responsible for the perception of light variation? What is the pigment responsible for this perception?

While eating peach or pear it is usually seen that some stone like structures get entangled in the teeth, what are these stone like structures called?