List of practice Questions

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
Real expansion of liquid is
Read the given statements that refer to different stages of plasmolysis. Select the correct option regarding them. (i) First stage of plasmolysis, when osmotic concentration of cell sap is just equivalent to that of external solution. (ii) Protoplast withdraws itself from corners of the cell wall. (iii) Protoplast gets detached from the cell wall and attains a spherical shape.
Read the given statements that describe certain infectious particle. (i) It was discovered by $T.O$. Diener and was found to be smaller than viruses. (ii) It causes potato spindle tuber disease. (iii) It is a free $RNA$ particle which lacks the protein coat. (iv) It has low molecular weight $RNA$ as genetic material. Which of the following is referred to here?
Read the given statements and select the correct option. Amphibians often hibernate in winter and aestivate in summer. They are poikilothermic animals and cannot regulate body temperature.
Read the given statements and select the correct option. Herbivores are also called as first order consumers. Herbivores obtain their food directly from plants.
Read the given statements and select the correct option. Irrigation without proper drainage of water leads to waterlogging in the soil. Waterlogging draws salts to the soil surface, which are deposited as a thin crust on the land surface or start collecting at the roots of the plants.
Read the given statements and select the correct option. Carboxylation is the most crucial step of Calvin cycle where $CO_{2}$ is utilised for the carboxylation of $RuBP$. Carboxylation is catalysed by the enzyme $RuBisCO$ which results in the formation of two molecules of $3PGA$.
Read the following statements regarding euglenoids and select the incorrect ones. (i) These are mostly freshwater organisms found in stagnant water. (ii) Their body is covered by a protein rich layer called pellicle which makes their body flexible. (iii) They are photosynthetic in the presence of sunlight but become heterotrophs in the absence of sunlight. (iv) They usually possess two flagella, one long and one short. (v) Euglenoids are multicellular ciliate protists.
Read the given statements and select the correct ones. (i) A membrane which permits the passage of pure solvent molecules to pass through it and not the solute particles is called semi-permeable. (ii) A membrane which allows some substances to pass through it more readily than others is known as selectively/ differentially permeable. (iii) All living biological membranes are perfectly semipermeable.
Read the given statements and select the correct option (i) Synaptic cleft of neurons secretes adrenaline (ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon (iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath (iv) Spinal and cranial nerves are made of non myelinated nerve fibres
Read the following statements (P - T) and select the option that correctly fills (i) - (v). P. The male frog has a special organ on the throat called membrane is a part of ear and serves to receive sound waves R. Dermis of the frog contains sac-like glands S. Tongue of frog is T. respiration takes place in lungs on land
Read the following statements and select the incorrect ones. (i) Homeostasis, ensures constant osmotic concentration of cells. (ii) The famous Keoladeo National Park (Bharatpur) in Rajasthan hosts thousands of migratory birds coming from Siberia, in every winter. (iii) $99\%$ of animals and nearly all plants are regulators. (iv) The conformers are able to maintain their body temperature inspite of changes in ambient temperature.
Read the following statements and select the option which identifies the incorrect ones. (i) Potato spindle tuber disease and Chrysanthemum stunt disease are caused by viroids. (ii) $T_{4}$ bacteriophage exhibits lytic cycle. (iii) Retroviruses have two copies of $ssRNA$. (iv) Interferons which prevent viral multiplication are glycolipid particles.
Read the following statements and select the correct option. Besides curdling of milk, $LAB$ also improve its nutritional quality by increasing vitamin $B_{12}$. $LAB$, when present in human stomach, check disease causing microbes.
Read the following statements and select the correct option. The prickly pear cactus introduced into Australia in early $1920s$ caused havoc by spreading rapidly into millions of hectares of rangeland. When certain exotic speciesare introduced into a geographical area, they become invasive and start spreading fast because the invaded land does not have its natural predators.
Read the following statements and select the correct option. Annual rings are distinct in plants growing in temperate regions. In temperate regions, the climatic conditions are not uniform through the year.
Read the following statements and select the correct option. Malarial parasite requires two hosts - humans and mosquitoes to complete its life cycle. Haemozoin is a toxic substance produced by the rupturing of liver cells during malarial infection.