List of practice Questions

Refer to the transverse section of ovary of mustard plant. Identify $X$ and $Y$ in it.
Refractory metals are used in construction of furnaces because
Regulation of gene expression occurs at the level of
Relative decrease in V.P. of an aqueous solution of NaCl is 0.167. Number of moles of NaCl presentin 180 g of $H_2O$ is
Refer to the given stages $A, B, C$ and $D$ of meiosis $I$ and select the incorrect statement regarding them.
Refer to the given statements' and select the correct ones (i) Fossils are remains of hard parts of life forms in rocks (ii) Dinosaurs disappeared about $65$ mya (iii) Animals called lobe fins evolved into reptiles (iv) Study of fossils is called palaentology
Refer to the given table of contrasting traits in pea plants studied by Mendel. Which of the given traits is correctly placed ?
Refer to the given figure representing different zones of a biosphere reserve.
Choose the correct answer as per the statements given below. (i) Limited human activity is allowed such as for research and education. (ii) An active co-operation occurs between reserve management and local people for activities like cropping, settlements, etc. (iii) No human activity is allowed.
Refer to the given figure showing reproductive system of female cockroach
Identify the parts labelled as $P, Q, R$ and $S$ and select the correct statement regarding these
Refer to the given figures showing structure of dicotyledonous seed and select the option that correctly identifies any of the labelled parts.
Reductive ozonolysis of benzene produces
Reductive ozonolysis of o-xylene gives
Refer the given figure of nudeosome and select the option that correctly identifies the parts $A, B$ and $C$.
Refer to the given figure of reproductive structure of Papaverand identify $X$ and $Y$.
Red phosphorus and hydrogen iodide reduce carboxylate ions to
Red phosphorus is less reactive than yellow phosphorus because
Red shift is an illustration of
Reduction of aldehyde with HI and P give
Red data book was first brought out in
Rectifier converts:
Red colour of tomatoes, carrots and chillies is due to the presence of a type of carotene pigment called as
Red Data Book deals with
Rearrange the following zones as seen in the root in vertical section and choose the correct option. A. Root hair zone B. Zone of meristems C. Root cap zone D. Zone of maturation E. Zone of elongation
Recognise the figure and find out the correct matching.
Read the passage given below and answer the question The hydrogen-like species $Li^{2+}$ is in a spherically symmetric state $S_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_2$. The state $S_2$ has one radial node and its energy is equal to the ground state energy of the hydrogen atom. Energy of the state $S_1$ in units of the hydrogen atom ground state energy is