AIIMS 2018

Identify the permanent tissues shown in the
following figures

Assertion : The collenchyma is a thick-walled
living tissue.
Reason : The collenchyma is thickened due
to deposition of pectin.

Assertion Taenia solium and Dugesia belong
to Platyhelminthes.
Reason : Platyhelminthes are coelomates.

Read the following statements
I. Species diversity decreases as we move away from the equator towards the poles.
II. Stellar's sea cow and passenger pigeon got extinct due to overexploitation by man.
III. Lantana and Eichhornia are invasive...

Which one of the following organisms do not evolve oxygen during photosynthesis?

Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

Find the correct statements from the following
I. Gene therapy is a genetic engineering technique used to treat diseases at molecular level.
II. Calcitonin is medically useful recombinant product in the treatment of infertility.
III. Bt tox...

cry II Ab and cry I Ab produce toxins that control

If a recombinant DNA bearing gene for ampicillin resistance is transferred into E. coli cells and the host cells are spread on agar plates containing ampicillin, then

Production of human protein in bacteria by genetic engineering is possible because

Match the stages of meiosis in column I to
their characteristic features in Column II and
select the correct option using the codes
given below.

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Assertion Meiotic division occurs in
reproductive cells.
Reason Synapsis occurs during zygotene of
meiosis.

Assertion In mitosis, two identical cells are
produced from a single cell and karyokinesis
is followed by cytokinesis.
Reason Cytokinesis is of two types, i.e. by
cell-furrow method and cell-plate method.

Assertion Peptide and polypeptide
hormones directly pass across the lipid
bilayer of plasma membrane.
Reason Oxytocin hormone can pass across
the plasma membrane.

Diagram of large intestine is given below.
Identify the parts A, B, C, D, E and F.

Select the incorrect match.
I. Sedimentary nutrient cycle-Nitrogen cycle
II. Pioneer species - Lichens
III. Secondary succession - Burned forests
IV. Pyramid of biomass in sea - Upright

Biomagnification can be defined as

Assertion : BOD is an indicator of pollution
in water.
Reason : High BOD is observed in highly
polluted water.

Choose the correct statements with reference to organic evolution.
I. Flippers of whale and wings of bat exhibit analogy.
II. Wings of butterfly and wings of bird exhibit homology.
III. Organs with dissimilar structure are called analogous ...

The peppered moth (Biston betularia), the black-coloured form becomes dominant over the light-coloured form of moth in England during industrial revolution. This is an example of

What is true about the isolated small tribal populations?

Characteristics of cancer are

Adults of Wuchereria bancrofti attack

Which of the following plants are used to treat bone fractures?

Person 'A' cannot step out of his house. He has to spend his entire life in sterile isolation otherwise, he would quickly contract a fatal infection. This person has almost no effective immune system. This disease is also called as baby in ...

Read the following statements
I. Colostrum is recommended for the new borns because it is rich in antigens.
II. Chikungunya is caused by a Gram negative bacterium.
III. Tissue culture has proved useful in obtaining virus-free plants.
IV. Be...

Assertion Alcoholics may show deficiency
symptoms of Wernicke’s and Korsakoff’s
syndromes.
Reason Alcohol acts as depressant.

Assertion Pork should be properly cooked to avoid Taenia infection.
Reason Pork of pig contains hexacanth and cysticercus larvae.

Assertion In females, parturition is the act
of giving birth to a baby.
Reason Signals for parturition originate
from a fully developed foetus.

Match the following columns.

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Match the organisms given in Column I to
their functions given in Column II and
choose the correct option.

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Match Column I (Antibiotic) with Column II
(Source) and choose the correct option from
the codes given below.

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Azolla is used as a biofertiliser because it

Assertion Nitrogen-fixing bacteria of
legume root nodules survive in oxygen
depleted cells.
Reason Leghaemoglobin completely
removes oxygen from nodule cells.

Assertion Magnesium is important in photosynthesis and carbohydrate metabolism.
Reason \(\mathrm{Mg}^{2+}\) is involved in the synthesis of nucleic acids.

Codons of glycine are

Leaf tendrils are found in

A plant has a butterfly-shaped flower with
one standard, two wing like and two keel
petals. To which family, this plant belongs?

Arrange in correct order according to the
given figures.

Assertion Caryopsis fruits differ from
typical achenes with respect to the fusion of
pericarp with the seed-coat (testa).
Reason Caryopsis fruits commonly occur in
the members of family–Poaceae.

From the graph of population growth, select the correct option having correct value of '\(r\)' and bar graph.

\(\mathrm{C}_4\) pathway is advantageous over \(\mathrm{C}_3\) pathway in plants, because it

Assertion Non-cyclic photophosphorylation
occurs in the stroma of chloroplasts.
Reason There is discontinuous flow of
electrons in this process.

Apical dominance is caused by

Assertion : The quiescent centre acts as a
reservoir of relatively resistant cells, which
constitute a permanent source of active initials.
Reason : The cells of the inactive region of
quiescent centre become active, when the
previous activ...

Assertion Photomodulation of flower is
phytochrome regulated process.
Reason Active form of phytochrome (Pfr)
directly induces floral induction in shoot
buds.

Select the incorrect statement(s) from the options given below with respect to dihybrid cross.
I. Tightly linked genes on the same chromosome show higher recombinations.
II. Genes far apart on the same chromosome show very few recombination...

A normal woman whose father was colourblind, marries a normal man. What kinds of children can be expected and in what proportion?

Which one of the following conditions correctly describes the manner of determining the sex?

Assertion Phenylketonuria is recessive
hereditary disease caused by body’s failure to
oxidise an amino acid phenylalanine to
tyrosine, because of defective enzyme.
Reason It is characterised by in the
presence of phenylalanine acid in urine...