The overuse of fertilisers in a farm results in the runoff pollution of nearby river. Which of the following graphs correctly represents the resulting changes in the levels of oxygen and bacteria in that river?
Could someone pls explain?
Refer to the given word grid and answer the following questions.
Birds with which of the following foot type is not present in the given word grid?
Which of the following options correctly identifies X and Y in the given Venn diagram that represents a plant structure?
(A) X - Root, Y - Root hair
(B) X - Leaf, Y - Leaf cell
(C) X - Stem, Y - Xylem
(D) X - Leaf, Y - Phloem
Refer to the given figure showing a process and select the correct statement regarding it.
Which of the following events also involve this process?
(i) Exchange of respiratory gases
(ii) Opening and closing of stomata
(iii) Swelling of dried raisins when soaked in water
(iv) Spreading of aroma of flowers
(v) Seismonastic movements in plants
A (i) and (iv) only
B (i) and (iii) only
C (i), (ii) and (iv) only
D (ii), (iii) and (v) only
give description along with this question
Refer to the given diagram of a type of connective tissue and select the incorrect option regarding it.
A P acts as phagocyte whereas T plays an important role during allergic reactions.
B Q provide only elasticity whereas S provides only strength.
C R secretes extracellular matrix whereas T produces a substance that checks clotting of blood inside the blood vessels.
D Q is made up of collagen protein whereas S is made up of elastin protein.
pl explain this a bit
The given apparatus can be used to show the diffusion of gases. Which pair of gases X and Y would cause no movement of the water?
Ms. Prabha a science teacher, prepared a mixture of water, potassium nitrate, sodium chloride and carbon tetrachloride. She divided the class into four groups and asked students to separate individual components. Different groups tried different methods in the given sequence.
Group I : Separating funnel, fractional distillation, sedimentation and then decantation.
Group II : Separating funnel, fractional distillation, and then distillation.
Group III : Fractional distillation, distillation and then fractional crystallisation.
Group IV : Separating funnel, fractional crystallisation and then evaporation.
Which group adopted the appropriate methods in the most appropriate sequence to separate individual components of the mixture?
A Group I
B Group II
C Group III
D Group IV
please give explanation why funnel will be used here
Elements X, Y and Z have valencies 1, 3 and 4 respectively. Formula unit masses of their oxides are 62, 102 and 64 respectively. If atomic mass of Z is divided by the difference in atomic masses of X and Y then value obtained is the atomic number of which of the following elements?