Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Rani was amazed to read about the layers and coverings in the plant. As her teacher taught her that like mammals, plants are also formed by various layers of tissues. Thus, forming the different plant system. As the epidermal tissue system forms the outermost covering of the body. She felt curious and asked her elder sister about the same, that how come this is possible. Her sister cleared all her doubts patiently.

1. From where it is derived?
2. Why are outer wall of some plants is cutinised?
3. In some cases, the cuticle is reinforced by a layer of wax. Explain the reason.
4. Extract the message from Rani's behavior.

Distinguish between cranial nerves and spinal nerves.

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

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?

Describe the half-leaf experiment on photosynthesis.

What is exophthalmic goitre? Mention any four symptoms of the disorder.

The vertebrate animal which is not egg laying is:

1. Fish
2. Amphibian
3. Reptile
4. Mammal

Non-living things also grow. Explain the statement with example.

1. When is a mineral element considered toxic in plant nutrition?
2. Why are the symptoms of toxicity difficult to identify?

What is the significance of vacuole in a plant cell?