Option “3” is correct BOD stands for Biochemical Oxygen Demand. It is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.
893. Minamata disease is caused by pollution of water by:
1. Lead
2. Tin
3. Methyl Isocyanate
4. Mercury
Option “4” is correct Minamata disease is a neurological syndrome caused by severe mercury poisoning.
894. To reduce tooth decay most toothpastes contain a –
1. Bromide
2. Fluoride
3. Iodide
4. Chloride
Option “2” is correct Fluoride in toothpastes prevent tooth decay from progressing and can even reverse, or stop, early tooth decay.
895. Which part of the plant gives us saffron?
1. Roots
2. Petals
3. Stem
4. Stigma
Option “4” is correct Saffron is a spice derived from the flower of Crocus sativus, commonly known as the “saffroncrocus”. The vivid crimson stigmas and styles, called threads, are collected and dried to be used mainly as a seasoning and colouring agent in food.
896. Consider the following plant hormones:
1. Gibberellins-Seed germination
2. Auxins-Apical dominance
3. Cytokinins-Climacteric ripening of fruits
Which among the above is/are correctly paired with their respective functions in plant physiology?1. Only 1
2. 1 and 2
3. 2 and 3
4. 1, 2 and 3
Option “2” is correct Cytokinins or CKs are a group of chemicals that influence cell division and shoot formation. Ethylene is related with the Climacteric ripening of fruits.
Option “3” is correct Crabs belongs to the phylum Arthropoda.
898. Which of the following is secreted by the liver?
1. Glucose
2. Iodine
3. Cortisol
4. Bile
Option “4” is correct Bile is produced continuously by the liver (liver bile), and stored and concentrated in the gallbladder (gallbladder bile).
899. Leptospirosis is a disease caused by-
1. Virus
2. Fungus
3. Protozoa
4. None
Option “4” is correct
Leptospirosis is a bacterial disease that affects humans and animals. It is caused by bacteria of the genus Leptospira.
900. The hormone that stimulates heart beat is-
1. Thyroxin
2. Gastrin
3. Glycogen
4. Dopamine
Option “1” is correct Thyroxine hormone can increase the heartbeat, it’s principal function is to stimulate the consumption of oxygen and thus the metabolism of all cells and tissues in the body.
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