Pericardial fluid is present between _________ of heart.

Cockroach and Snails show circulation of blood through haemocoel. It is __________ .

First evidence for triplet genetic code was given by _________ .

Given below are two statements about sewage. Based on them select the correct option given below.
Statement I: The sediment in settling tank is called floc.
Statement II: Sewage is first passed in grit chamber then it is screened.

A population is a group of all __________ in a given time.

Which of the following are analogous organs?

In the life cycle of Plasmodium vivax, if a (Trophozoite), b (gametocyte), c (oocyst), d (zygote), e (sporozoite) are different stages. Select the correct sequence starting from the stage it enters the human body.

One of the basic elements considered in green revolution is _________.

The viscous force between two liquid layers is

The deflection in moving coil galvanometer of resistance \(45 \Omega\) falls from 30 divisions to 3 divisions. The length of the shunt wire required to convert galvanometer to ammeter is [specific resistance of material of shunt wire \(=5 \times 10^{-7} \Omega \mathrm{m}\) and area of cross- section of wire \(\left.=4 \times 10^{-7} \mathrm{~m}^{2}\right]\)

In the ecological hierarchy the basic unit is _________.

Identify the false statement among the following.

Select the correct statement/s regarding blood groups in human.
i. Some genetically determined blood group systems are ABO, Rh, Duffy, Lewis, Bombay blood group etc.
ii. Three types of agglutinogens are present on surface of human RBCs such as A, B and D.
iii. Individuals with blood group "AB Rh +ve" have A, B and D antigens on the surface of their RBCs and both antibodies 'a' and 'b' in their plasma.
iv. Haemolytic disease of Newborn occurs when mother with Rh-ve blood group conceives Rh -ve foetus.
v. Individuals with 'AB' blood group are called universal donors while those with 'O' blood group are called universal acceptors, with reference to blood transfusion.