Morphology of Flowering Plants — BIOLOGY STD 11 Science — Question

Aakash suffered from frequent weight loss, weakness, nausea, vomiting and diarrhoea. His father took him to the doctor who examined him and concluded that he is suffering from Addison's disease, which is a hormonal disorder.

1. What is Addison's disease?
2. Which endocrine gland secretes mineralocorticoids?
3. What are the other effects caused by deficiency of mineralocorticoid?
4. What values are displayed by Aakash's father?

In countries where dietary intake of iodine is low, goitres, enlargement of the thyroid are common. What would you say about the chain of events leading to formation of goitre?

A common characteristic of all vertebrates is:

1. Presence of skull.
2. Division of body into head, neck, trunk and tail.
3. Presence of two pairs of functional appendages.
4. Body is covered with an exoskeleton.

The heart keeps on beating; tirelessly; throughout the life. What lesson can be drawn from this property of the heart? Explain, which kind of diet should be taken to maintain a healthy heart?

1. We should study continuously to excel in life.
2. We should work tirelessly to attain our goal.

‘Both a short day plant and a long day plant can produce can flower simultaneously in a given place’. Explain.

Describe Sigmoid growth curve.

Fern prothallus is monoecious. Justify.

Excretion is an important process as it helps in getting rid of waste from the body. Which of these is similar to this fact? What is the importance of maintaining cleanliness at public places?

1. Cleaning our home is necessary to create a healthy place for living.
2. Garbage should be thrown out every day.
3. Garbage dumping sites should be far away from the city limits.

In what form is oxygen carried in the red blood cells? What happens to this form when the blood reaches the tissues?

What are the conditions necessary for growth? Explain.