NEET - Grade 11 - Biology - Mineral Nutrition - Study ref# 4416
Write down the function and how they are absorbed by
plants:
Nitrogen, phosphorous, potassium, calcium, magnesium and
sulphur. Answer:
read moreNEET - Grade 11 - Biology - Mineral Nutrition - Study ref# 4419What are the different steps involve in nitrogen cycle? Answer: Nitrogen cycle
i) Nitrogen fixation:
Atmospheric nitrogen is converted into those forms which are absorbed by the
plants. Plant use them for synthesis of different organic ... read moreNEET - Grade 11 - Biology - Digestion and Absorption - Study ref# 4737Classify small intestine and write down its main function?
Answer: The longest part of alimentary
canal is small intestine. It is divided into:
Duodenum: A C-shaped
structure, it receives both bile duct and pancreatic duct.
Je... read moreNEET - Grade 12 - Chemistry - Biomolecules - Study ref# 10012Nucleic acids are the polymers of
(a) nucleosides (b) nucleotides
(c) bases (d) sugars Answer: Nucleic acids are polymers of nucleotides
in which nucleic acids are linked together by phosphodiester linkage.
e.g., D.N.A... read moreNEET - Grade 12 - Chemistry - Chemistry in Everyday Life - Study ref# 10061The most useful classification of drugs
for medicinal chemists is…….
(a) on the basis of chemical structure
(b) on the basis of drug action
(c) on the basis of molecular targets
(d) on the basis of pharmacological
effect A... read moreNEET - Grade 12 - Chemistry - Chemistry in Everyday Life - Study ref# 10069Which of the following is not a target
molecule for drug function in body?
(a) Carbohydrates (b) Lipids (c)
Vitamins (d) Proteins Answer: (c) Drugs usually interact with
biomolecules as carbohydrates, lipids, proteins and ... read moreNEET - Grade 12 - Biology - Sexual Reproduction in Flowering Plants - Study ref# 10124Why are angiosperm anther called
dithecous? Describe the structure of its microsporangium. Answer: A typical angiosperm anther is bilobed
with each lobe having two pollen sacs. Hence, angiosperm anther are called
dithecous.
Structure of M... read moreNEET - Grade 12 - Biology - Sexual Reproduction in Flowering Plants - Study ref# 10132Why is fertilization in angiosperms
referred to as double fertilization? Explain. Answer: Fertilization in angiosperms is referred
as double fertilization, because two male gametes of a single male
gametophyte fuse differently with two dif... read moreNEET - Grade 12 - Biology - Sexual Reproduction in Flowering Plants - Study ref# 10134Explain the events upto fertilization
that occur in a flower after the pollen grain has landed on its compatible
stigma. Answer: The pollen grain germinates on the stigma
to produce a pollen tube through one of the germ pores, the content o... read moreNEET - Grade 12 - Biology - Sexual Reproduction in Flowering Plants - Study ref# 10136Meiocyte of rice has 24 chromosomes.
Write the number of chromosomes in its endosperm. Answer: Number of chromosomes in meiocyte = 24 =
2n.
Haploid number (n) = 12.
Therefore, the number of chromosomes will
be n × 3 = 36, because t... read moreNEET - Grade 12 - Biology - Ecosystem - Study ref# 10435Carbon cycle in nature is a biogeochemical
cycle. Explain how is it different from phosphorus cycle?
OR
Explain with the help of a flow chart
recycling f phosphorus in nature. How s phosphorus cycle different from
carbon cycle in natur... read moreNEET - Grade 12 - Physics - Atoms - Study ref# 10649 molecule
consists of two oxygen atoms. In the molecule, nuclear force between the
nuclei of the two atoms
(a) is not important because nuclear
forces are short-ranged.
(b) is as impo... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10664Write any two characteristic properties
of nuclear forces Answer: (i) Nuclear forces are very strong and
short range forces.
(ii) Nuclear forces are change
independent.... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10665Write the relation for binding energy
(BE) (in MeV) of a nucleus of mass atomic
number (Z) and mass number (A) in terms of the masses of its constituents –
neutrons and protons. Answer: B.E. = read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10666Two nuclei have mass numbers in the ratio
1:2. What is the ratio of their nuclear densities? Answer: The nuclear density is same for all the
nuclei. Hence the ratio of their densities is 1:1.... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10667Calculate the energy in fusion reaction:
where,
BE of and of Answer: Total Binding energy of Initial System
i.e., read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10668Four nuclei of an element undergo fusion
to form a heavier nucleus, with release of energy. Which of the two – the
parent of the daughter nuclei – would have higher binding energy per nucleon? Answer: Daughter nuclei have higher binding
ener... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10669If both the number of protons and
neutrons in a nuclear reaction is conserved, in what way is mass converted
into energy (or vice versa)? Explain giving one example. Answer:
If we take ab... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10670Show that the density of nucleus over a
wide range of nuclei is constant and independent of mass number. Answer: We have
∴ Density, ... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10671(i) The mass of a nucleus in its ground
state is always less than the total mass of its constituents-neutrons and
protons. Explain.
(ii) Plot a graph showing variation of
potential energy of a pair of nucleons as a function of their separ... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10672(i) Explain the processes of nuclear
fission and nuclear fusion by using the plot of binding energy per nucleon
(BE/A) versus the mass number A.
(ii) A radioactive isotope has a
half-life of 10 years. How long will it take for the activit... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10673Binding energy per nucleon versus mass
number curve is as shown.
and
are four nuclei indicated on
the curve.
Based on the graph:
(a) Arrange X,W and S in the increasing
... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10674How are protons, which are positively charged,
held together inside a nucleus? Explain the variation of potential energy of
a pair of nucleons as a function of their separation. State the significance
of negative potential energy in this reg... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10675The gravitational force between a H-atom
and another particle of mass m will be given by Newton’s law:
(a)
(b) read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10676Define the activity of a given
radioactive substance. Write its S.I. unit. Answer: The total decay rate of a radioactive
sample is called the activity of the sample. Its S.I. unit is becquerel (Bq).... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10677A radioactive nucleus ʹAʹ
undergoes a series of given below:
The mass number and atomic number of are 176 and 71 respectively.
Determine the mass and atomic numbers of read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10678Why is it found experimentally difficult
to detect neutrinos in nuclear β-decay? Answer: Neutrinos are neutral (chargeless),
(almost) massless particles that hardly interact with matter.
Alternatively,
The neutrinos can penetrate lar... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10679In both and
decay processes, the mass
number of a nucleus remains same whereas the atomic number Z increases by one
in decay and decreased by one in decay. Explain, giving reason. Answe... read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10680(i) Write the basic nuclear process
involved in the emission of in a
symbolic form, by a radioactive nucleus.
(ii) In the reactions given below:
(a)
(b) read moreNEET - Grade 12 - Physics - Nuclei - Study ref# 10681Heavy water is a suitable moderator in a
nuclear reactor. Explain briefly why? Answer: The moderator is used in nuclear reactor
to reduce the velocity of neutrons so that it can break the uranium nucleus.
Heavy water which has heavy hydrogen... read moreNEET - Grade 12 - Biology - Environmental Issues - Study ref# 10774(i) ... read more
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