Which of the following is true of Aves?

Aves have two additional chambers to the alimentary canal: the crop and the gizzard. Birds eat tiny pebbles that lodge in the gizzard and help the muscular gizzard in crushing food. Birds have 12 pairs of cranial nerves

They are poikilotherms and have a three chambered heart

The correct Option is "Tiny pebbles eaten by some birds and are used in crushing"

They have 10 pairs of cranial nerves

Which of the following is true about phylum-Platyhelminthes?

Most members of phylum-Platyhelminthes are endoparasites characterised by the presence of hooks and suckers for attachment inside the host

The correct Option is "They are mostly endoparasites"

Which of the following is true?

Vessels or tracheae are made up of a row of cells placed one above the other with their intervening walls absent or variously poured. These have wide lumen for conduction of minerals and water. While tracheids are unicellular and have a narrow lumen.

Vessels are unicellular and with narrow lumen

The correct Option is "Vessels are multicellular and with wide lumen"

Tracheids are unicellular and with wide lumen

Tracheids are multicellular and with narrow lumen

Which of the following is true regarding manganese toxicity in plants?

The prominent symptoms of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins. It is important to know that manganese competes with iron and magnesium for its uptake by the plants and with magnesium for its binding with enzymes. Manganese also inhibits calcium translocation in shoot apex. Therefore, excess of manganese may induce deficiencies of iron, magnesium and calcium

Induction deficiencies of iron, magnesium and calcium

Appearance of brown spots surrounded by chlorotic veins

Inhibition of $C{a^{2 + }}$ ions translocation in the shoot apex

The correct Option is "All of the above"

A particle moves along x-axis as $x = 4\left( {t - 2} \right) + a{\left( {t - 2} \right)^2}$ Which of the following is true

$x = 4\left( {t - 2} \right) + a{\left( {t - 2} \right)^2}$ At $t = 0,\;x = - 8 + 4a = 4a - 8$ , $v = \frac{{dx}}{{dt}} = 4 + 2a\left( {t - 2} \right)$ At $t = 0,\;v = 4 - 4a = 4\left( {1 - a} \right)$ But acceleration , $a = \frac{{{d^2}x}}{{d{t^2}}} = 2a$

The initial velocity of the particle is 4

The correct Option is "The acceleration of particle is 2a"

The particle is at origin at t=0

Which of the following is true regarding glycolysis? I. Takes place in cytosol II. Produces no ATP III. Has no connection with electron transport chain IV. Reduces two molecules of NAD$ + $ for every glucose molecule processed Choose the correct option

In the process of glycolysis, 6 carbon molecules of glucose is split into 2, 3-carbon molecules of pyruvic acid. In this, one molecules of NAD$ + $ are reduced for each glucose molecule. The energy stored with the NADH is released in the electron transport chain. This process (glycolysis) occurs in cytosol

Which of the following is true about linkage I. It is phenomenon in which more recombinants are produced in ${{\rm{F}}_2}$-generation II. More parental combination are produced in ${{\rm{F}}_2}$-generation III. Genotype which are present in ${{\rm{F}}_1}$ hybrid. Reappear in high frequency in ${{\rm{F}}_2}$-generation IV. It is a phenomenon in which two chromosome are linked

Linkage and Recombination Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex linked. The crosses were similar to the dihybrid crosses carried out by Mendel in peas. He observed that when two genes were grouped on the same chromosome, same genes are highly linked of associated and show low recombination. When the genes are clearly present linked they show higher recombination. Morgan attributed this due to the physical association or linkage of the two genes and coined the term linkage to describe this physical association of genes on a chromosome and the term recombination to describe the generation of non-parental gene combinations. His student Alfred Sturtevant used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes and ‘mapped’ their position on the chromosome. Morgan hybridized yellow bodied and white eyed females with brown bodied and red eyed male (wild type) (cross-A) and inter-crossed their ${{\rm{F}}_1}$-progeny

Which of the following is true in the case of an adiabatic process, where $\gamma = {C_p}/{C_v}?$

For adiabatic change equation of state is $p{V^{\rm{\gamma }}} = {\rm{constant}}$ It can also be re-written as $T{V^{{\rm{\gamma }} - 1}} = constant\left[ {as{\rm{ }}p = \frac{{nRT}}{V}} \right]$ and ${p^{1 - {\rm{\gamma }}}}{T^{\rm{\gamma }}} = {\rm{constant}}\left[ {as{\rm{ }}V = \frac{{nRT}}{P}} \right]$

The correct Option is "${p^{1 - \gamma }}{T^\gamma } = {\rm{constant}}$"

${p^\gamma }{T^{1 - \gamma }} = {\rm{constant}}$

$p{T^\gamma } = {\rm{constant}}$

${p^\gamma }T = {\rm{constant}}$

In a closed container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true?

∆E=q+W q=0 (∵ Temperature is to be increase, no heat should enter or leave the system) ∆E=q+W=0+W or ∆E=W ∴ W≠0,q=0

The correct Option is "∆E=W≠0,q=0"

Two Cu wires of radii ${{\rm{R}}_1}\,\,{\rm{and}}\,\,{{\rm{R}}_2}$ such that $\left( {{R_1} > {R_2}} \right)$. Then which of the following is true?

The velocity of a transverse wave $\begin{array}{l} v = \sqrt {\frac{T}{{\rho A}}} \\ v \propto \frac{1}{{\sqrt A }}\\ Or\\ v \propto \frac{1}{R} \end{array}$ Because the velocity of wire depend on the radius. So transverse wave travels faster in thinner wire.

Transverse wave travels after in thicker wire

The correct Option is "Transverse wave travels faster in thinner wire"

Travels with the same speed in both the wires

When both the listener and source are moving towards each other, then which of the following is true regarding frequency and wavelength of wave observed by the observer?

According to Doppler’s effect, whenever there is a relative motion between a source of sound and listener, the apparent frequency of sound heard by the listener is different from the actual frequency of sound emitted by the source. Let $S$ be source of sound and $L$ the listener of sound. Let $v$ be the actual frequency of sound emitted by the source and $\lambda $ be the actual wavelength of the sound emitted. If $v$ is velocity of sound in still air, then $\lambda = \frac{v}{V}$ If velocity of listener is ${v_L}$ and velocity of source is ${v_s}$, then apparent frequency of sound waves heard by the listener is $v' = \frac{{v - {v_L}}}{{v - {s_s}}} \times \,V$ Here, both source and listener are approaching each other. Then ${v_s}$ is positive and ${v_L}$ is negative. $\begin{array}{l} \therefore v' = \frac{{v - \left( { - {v_L}} \right)}}{{v - {v_s}}}v = \left( {\frac{{v + {v_L}}}{{v - {v_s}}}} \right)v\\ i.e.,\,\,v' > v \end{array}$ Also, $\lambda ' < \lambda $ So, listener listens more frequency and observes less wavelength. .

The correct Option is "More frequency, less wavelength"

More frequency, more wavelength

Less frequency, less wavelength

More frequency, constant wavelength

At constant pressure, which of the following is true?

Pressure due to an ideal gas is given by $p = \frac{M}{{3V}}{v^2}$ Putting $\frac{M}{V} = \rho ,$ the density of gas $p = \frac{1}{3}\rho {v^2}$ $ \Rightarrow \;\;v = \sqrt {\left( {\frac{{3p}}{\rho }} \right)} \;$ $\therefore \;\;v \propto \frac{1}{{\sqrt \rho }}$

The correct Option is "$v \propto \frac{1}{{\sqrt \rho }}$"

Which of the following is true for number of spectral lines in going from Lyman series to $P$-fund series

Maximum number of spectral lines are observed in Lyman series

The correct Option is "Decreases"

Which of the following is true for rays coming from infinity ? .

Since, lens is made of two layers of different refractive indices, for a given wavelength of light it will have two focal lengths or will form two images at two different points as there are $\mu $’s as $\frac{1}{f} \propto \,\,\left( {\mu \, - 1} \right)$

The correct Option is "Two images are formed"

Continuous image is formed between focal points of upper and lower lens

Which of the following is true in respect of adsorption?

Adsorption is an exothermic process and hence, $\Delta H$ is negative for adsorption. On the other hand the molecules of the adsorbate are held on the surface of the adsorbent and hence, they have lesser tendency to move about freely. In other words entropy decreases i.e.,$\Delta S$ is negative. According to Gibbs-Helmholtz equation, $\Delta G = \Delta H - T.\Delta S$ Thus, for the process of adsorption to occur $\Delta G$ must be negative. Hence, for adsorption $\Delta G < 0;\Delta S < 0;\Delta H < 0$

The correct Option is "$\Delta G < 0;\Delta S < 0;\Delta H < 0$"

$\Delta G > 0;\Delta S > 0;\Delta H < 0$

According to postulates of Werner’s theory for coordination compounds, which of the following is true?

According to postulates of Werner’s theory for coordination compounds, metal atoms exhibit two types of valencies i.e., primary valency and secondary valency. The primary valency is ionisable whereas the secondary valency is non-ionisable.

The correct Option is "Primary valencies are ionizable"

Secondary valencies are ionizable

Only primary valencies are non-ionizable

Primary and secondary valencies are non-ionizable

Insulin and glucagon are transported to target organ by

Cystic duct transports insulin and glucagon to target organ.

The correct Option is "Cystic duct"

Pheromones are also called: I. ectohormones, II. sex attractants, III. semichemicals. The correct option is

Pheromone are chemicals used for communication amongst individual of same species. Also known as ectohormones/sex attractants/semi chemicals. Pheromones involve a specific response in other members like recognition, warning and attraction

The correct Option is "I, II and III"

Arthritis Inflammation of joints Rheumatoid arthritis Hard tissue deposites over articular cartilage along with the higher secretion of synovial fluid, causing pain and stiffness which leads to rheumatoid arthritis Osteoarthritis Tearing of articular cartilage and development of bony lumps at places causing pain, stiffness and permanent bending which lead to osteoarthritis

The correct Option is "Inflammation of joints"

Which of the damaged cells cannot be repaired?

Two types of brain cells are-the neuron and neuroglia. Neurons are functional typical nerve cells, which generate and conduct impulses. Due to high degree of specialization, the neuron loss their ability to divide. The neuroglia have ability of division.

The correct Option is "Brain cells"

The golden age of reptiles was

Mesozoic era – Age of reptiles Coenozoic era – Age of mammals Palaeozoic era – Age of fishes

The correct Option is "Mesozoic era"

Match the of source gland with its respective hormone as well as its function and choose the correct option.

Neurohypophysis (Pars nervosa) also known as posterior pituitary, stores and releases two hormones called oxytocin and vasopressin, which are actually synthesized from the hypothalamus and are transported axonally to neutophypophysis. ACTH is released by adenohypophysis. ACTH stimulates adrenal cortex of suprarenal gland.