1. Mutualism
2. Intraspecific competition
3. Interspecific competition
4. Predation on one another
Intraspecific competition
1. Sugarcane and sunflower
2. Teak and pine
3. Deodar and fern
4. Wheat and maiden hair fern
Teak and pine
1. Floating ribs—2 pairs
2. Collar bones—3 pairs
3. Salivary glands—1 pair
4. Cranial nerves—10 pairs
Collar bones—3 pairs
1. Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
2. Secretion of tears after falling of sand particles into the eye
3. Salivation of mouth at the sight of delicious food
4. Secretion of sweat glands and constriction of skin blood vessels when it is too hot
Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
1. White blood cells
2. Unstriated muscle cells
3. Liver cells
4. Red blood cells
Red blood cells
1. Thyroxin
2. Adrenaline
3. Glucagon
4. Gastrin
Adrenaline
1. certain fungi
2. certain types of bacteria
3. all viruses
4. most virus-infected cells
certain types of bacteria
1. First negative,then positive and again back to negative
2. First positive,then negative and continue to be negative
3. First negative,then positive and continue to be positive
4. First positive,then negative and again back to positive
First negative,then positive and again back to negative
1. phosphorus and sulphur
2. sulphur and magnesium
3. magnesium and sodium
4. calcium and phosphorus
phosphorus and sulphur
1. more sodium in his urine
2. less amino acids in his urine
3. more glucose in his blood
4. less urea in his urine
more sodium in his urine