Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question

In what kind of plants do you come across Kranz anatomy? To which conditions are those plants better adapted? How are these plants better adapted than the plants, which lack this anatomy?

How is cardiac activity regulated by the nervous system?

Raju has recently joined the gym. The very first day, while doing exercise, he felt increased rate of respiration, heartbeat, sweating, etc. He got worried as he experienced the sudden changes in his body. He discussed it with his brother who is a biology student. His brother smiled and explained him that these are the normal activities of the organs/ organ systems that occur during exercise for the maintenance of normal physiology of the human body.

1. Name the processes that are necessary for maintaining normal physiology of the human body.
2. Define coordination and integration.
3. Explain the functions of various organs of the by body that are coordinated and integrated during exercise.
4. What values did Raju's brother possess?

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves.

1. Does it indicate that the element is actively mobilised or relatively immobile?
2. Name two elements which are highly mobile and two which are relatively immobile.

How is the aspect of mobility of elements important to horticulture and agriculture?

Differentiate between the following: Imbibition and diffusion

What is hemodialysis? Describe the various stages of its process.

Facilitated diffusion involving membrane proteins is categorised under passive transport. Why? Also draw a neat and labelled diagram showing facilitated diffusion.

Give a schematic diagram showing basic architecture of a chordate.

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.

Explain the working mechanism of hormones that control the dilution and concentration of urine.