Cell The Unit of Life — BIOLOGY STD 11 Science — Question

'Both growth and differentiation in higher plants are open.' Comment.

What are the divisions of earthworm's body according to clitellum?

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?

Different forms of the amino acids also has acidic amino acids. Write about it. Also, give structure of any one acidic amino acid.

Differentiate between primary and secondary meta bolites.

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

1. Mitochondria: Produce cellular energy in the form of ATP.
2. Golgi apparatus: Site of formation of glycoproteins and gloycolipids.
3. Smooth endoplasmic reticulum: The major site for synthesis of lipid.
4. Centrosome: Trap light energy for photosynthesis.

Two groups (A and B) of bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light of wavelength 400-450 nm and Group B to light of wavelength of 500-550 nm. Compare the photosynthetic rate of the two groups giving reason.

Write any four differences between tracheoles and bronchioles.

Where is cytochrome-c located? What is its function?