Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Name the three basic tissue systems in the flowering plants. Give the tissue names under each system.

Which one of the following animals possesses nerve cells but no nerves?

1. Hydra.
2. Tapeworm.
3. Earthworm.
4. Frog’s tadpole.

Why do we believe chloroplast and mitochon dria to be semi-autonomous organelle?

Which tissue of animals and plants exhibits meiosis?

Avantika, who works in a publication house suffered from severe back pain, for the last three months. She visited a doctor, who explained that it was due to her wrong sitting posture during the office hours. He also suggested her that she should avoid long working hours continuously.

1. List two disorders that may be caused by wrong sitting posture.
2. Write the vertebral formula of humans.
3. What precautions should be taken to avoid such problem?
4. What value is shown by Avantika?

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?

Why do we consider blood as a connective tissue?

What do the terms phycobiont and mycobiont signify?

Given below are the pairs of some proteins and their functions. Which out of these is not a matching pair and why?

S. No.	Protein	Function
(a)	Collagen	Intercellular ground substance
(b)	Antibody	Fight infectious agents
(c)	Insulin	Enzyme
(d)	GLUT-4	Enables glucose transport into cells

Why there is a need to standardise the system of naming of living organisms?