Neural Control and Coordination — BIOLOGY STD 11 Science — Question

Describe the structure of adipose tissue briefly with the help of diagram.

For completion of respiration process, write the given steps in sequential manner.

1. Diffusion of gases (O₂ and CO₂) across alveolar membrane.
2. Transport of gases by blood.
3. Utilisation of O₂ by the cells for catabolic reactions and resultant release of CO₂ .
4. Pulmonary ventilation by which atmos-pheric air is drawn in and CO₂ rich alveolar air is released out.
5. Diffusion of O₂ and CO₂ between blood and tissues.

Explain the following processes :
Polarisation of the membrane of a nerve fibre

Difference between Heartbeat and Pulse.

Explain the mechanism of urine formation.

Ankit, a Xl class student was continuously listening to his sister and her friend's discussion about the growth of plant. They were discussing that plant growth involves three phenomena, i.e., differentiation, dedifferentiation and redifferention. Listening this Ankit interrupted them in between and asked her sister to elaborate the things in detail and the basic phenomenon behind it. As the topic was the part of the Ankit's syllabus also. Her sister explained him that the cells in plant undergo differentiation to attain a maturity in order to perform specific functions.

1. What is dedifferentiation? Name two tissues formed by this process phenomenon.
2. What is redifferentiation?
3. What value is learnt from the Ankit's character as an ideal biology student.

What are Casparian strips? Write any two differences in the epidermis of monocotyledon and dicotyledon leaves.

What do grey and white matter in the brain represent?

What are the main structures in a monocot seeds? Describe with the help of suitable diagram.

Draw the following structures of Pisum sativum:

1. Diadelphous androecium.
2. Carpel.
3. TS of ovary.