Quiz no. 2 from RENU EDUCATIONAL GROUP

RENU EDUCATIONALGROUP
RENU EDUCATIONAL GROUP BY VIJAY K VERMA
Present
INTERACTIVE
MULTIPLE CHOICE
QUESTIONS

These multiple choice questions in some cases, there may be
more than one acceptable answer.
For this reason, even if you select a correct answer at your
first attempt, it is worth looking at all the alternatives
(a) to see if there is a better answer and
(b) to see why some of the alternatives are unacceptable.
Test 2

Hi
I am batty your
quiz instructor . I
ask you some
question . OK
R u ready ?
QUESTION 1

(a) A food source, oxygen, enzymes, a blood supply
The process of aerobic respiration requires
Question 1
(b) A food source, carbon dioxide, enzymes
(c) Oxygen, enzymes, sunlight
(d) A food source, oxygen, enzymes
Question 2

Respiration occurs in all living cells including
plants, bacteria and single celled organisms, none of
which have a blood supply.
No

Carbon dioxide is a product of respiration
No

Sunlight is necessary for photosynthesis but not for respiration
No

CORRECT ANSWER
Components of the food source are combined
with oxygen, and energy is ‘released’*.
Enzymes are catalysts which speed up these
reactions
* Most of the energy is used to drive other living
processes though some it is released as heat

Question 2
This organism is classified as an insect because it has
(a) a segmented body
(b) three pairs of walking legs
(c) wings
(d) jointed legs
Question 3

Insects do have segmented bodies but so do
annelid worms such as the earthworm
No

This is the single characteristic of those listed that
determines that the creature is an insect.
However, you should bear in mind that if asked for a
definition of an insect, all the characteristics listed
should be included
Yes

Most insects do have wings but some are wingless
e.g. fleas
No

Insects do have jointed legs but so do crustacea such
as crabs and lobsters
Jointed legs are a feature of the Arthropods, which
include insects.
No

Question 3
In a plant cell, which structure is responsible for controlling the
entry or exit of substances?
(a) The cell wall.
(b) The cell membrane
(c) The nucleus
(d) The cytoplasm
Question 4

The cell wall is generally regarded as being freely
permeable to water and dissolved substances. Its
structure does prevent the passage of large
molecules such as some proteins but this is not the
same as exercising control
No

This is the correct answer

The nucleus does control most of the
activities in the cell but does not exert
direct control over the entry and exit of
substances.
No

The cytoplasm is responsible for constructing the
cell membrane but does not exert direct control
over the entry and exit of substances.
No

Question 4
What will be the products of digestion of fish ?
(a) Glucose and amino acids
(b) Glucose, amino acids, fatty acids and
glycerol, minerals and vitamins,
(c) Glucose, glycerol and fatty acids
(d) Glucose, amino acids, glycerol and fatty
acids
Question 5

Fish contain fats as well as protein and carbohydrate
No

This is largely correct but vitamins and minerals are not digestion
products. They are absorbed unchanged.
If vitamins were broken down by digestion they would lose their
properties
No

Fish contain proteins as well as carbohydrates and fats
No

Yes
The proteins are digested to amino acids.
The carbohydrates are digested to glucose
The fats are digested to glycerol and fatty acids

Question 5
A male, homozygous dominant black mouse is mated with a
homozygous recessive female brown mouse. The black genotype is
BB, the brown genotype is bb. Would you expect the offspring to
be
(a) all brown
(b) all black
(c) 50% black and 50% brown
(d) all intermediate in colour?
Question 6

All the male gametes will carry the dominant allele B.
The female gametes will carry the recessive allele b. This
means that the genotype of all the offspring will be Bb.
There can be no brown mice (bb).
No

Yes.
All the male gametes will carry the dominant allele B.
The female gametes will carry the recessive allele b.
This means that the genotype of all the offspring will
be Bb.
Since the allele for black is dominant, all the offspring
will be black

All the male gametes will carry the dominant
allele B.
The female gametes will carry the recessive
allele b. This means that the genotype of all the
offspring will be Bb.
There can be no brown mice (bb).
No

If the alleles for black and brown fur were equally
dominant (codominant), an intermediate colour
might result but because only the black allele is
dominant, this is not a possibility
No

Question 6
Which of these organisms can be classed as producers in a food
chain?
(a) Earthworms
(b) Mosses
(c) Fungi
(d) Trees
Question 7

Earthworms are near the bottom of a food chain but
they are not producers. They are consumers,
digesting and absorbing dead organic matter in the
soil
No
No

Mosses are producers. Although they are simple
plants they contain chlorophyll and produce their
food by photosynthesis
Yes

Fungi are not producers. They digest and absorb
organic matter in soil, dead wood or other
decomposing matter
No

Trees are producers. The chlorophyll in their
leaves enables them to produce food by
photosynthesis
Yes

Question 7
After blood has picked up oxygen in the lungs, what route does it
take to deliver it to a muscle in the arm?
(a) Pulmonary artery, left atrium, left ventricle,
aorta, subclavian (to arm) artery
(b) Pulmonary vein, left atrium, left ventricle, aorta,
subclavian artery
(c) Pulmonary vein, right atrium, right ventricle,
aorta, subclavian artery
(d) Pulmonary vein, right atrium, left ventricle,
aorta, subclavian artery
Question 8

The vessels returning blood to the heart are the veins
No

This is the correct route. The oxygen will be used in
respiration, perhaps to produce muscle contraction
Yes

The pulmonary vein returns blood to the left side of the heart
No

The right and left chambers of the heart are completely separate,
Blood cannot cross from one side to the other.
No

Question 8
A B
M
A is a weak solution of sugar in water. B is a strong solution
of sugar in water. M is a selectively permeable membrane.
After a period of time, the solution level will
(d) rise on both sides
(c) remain the same
(b) rise in B and sink in A
(a) rise in A and sink in B
Question 9

The water molecules in A can move freely. The sugar
molecules in B attract a cluster of water molecules
which therefore cannot move freely. Water molecules
can pass through the selectively permeable membrane
in both directions but there are more freely moving
water molecules in A than in B
No

Yes
The water molecules in A can move freely. The sugar
molecules in B attract a cluster of water molecules
which cannot move freely. Water molecules can pass
through the selectively permeable membrane in both
directions but there are more freely moving water
molecules in A than in B so more water will pass from A
to B than in the other direction. The water level in A will
therefore fall, and that in B will rise

This would happen if the membrane were freely
permeable to water molecules and sugar molecules.
The membrane, however, is selectively permeable
No

You must be joking

Question 9
Which of these statements is most accurate?
In bright sunlight a green plant will be
(a) photosynthesising only
(b) respiring only
(c) photosynthesising and respiring
(d) taking in oxygen and giving out CO2
Question 10

In bright sunlight the plant will certainly be
photosynthesising, but this is not the only process
going on
No

Living organisms are respiring all the time. A plant
will be respiring in daylight and darkness, but in bright
sunlight you would expect photosynthesis to be taking
place as well
No

Yes
Respiration takes place all the time but in bright
sunlight, photosynthesis will be going on as well.

Respiration uses oxygen and produces carbon dioxide.
Photosynthesis uses carbon dioxide and produces oxygen.
In bright sunlight, photosynthesis will be going on faster
than respiration so there would be a net intake of carbon
dioxide and a net output of oxygen
No

Question 10
The force which carries water up a tree trunk is produced by
(c) osmosis
(b) root pressure
(a) evaporation from the leaves
(d) active transport
Question 11

Evaporation of water from the leaves (transpiration)
produces a ‘water tension’ which ‘pulls’ water up through
the xylem vessels in the trunk
Yes

Root pressure can certainly generate a force that ‘pushes’ water
up through the vessels in the trunk but it is not sufficient to
account for the rise which takes water to the top of a tree
No

Osmosis is responsible for creating root pressure
but this is insufficient to drive water to the top of
a tree
No

Active transport is something which happens in cells. It is usually
concerned with the cell taking in specific substances. It cannot
produce a mass flow of water.
No

Question 11
A reflex action occurs when
(a) a stimulus produces a response
(b) a reaction to a stimulus cannot be
consciously controlled
(c) the nervous pathway involves only the
spinal cord and spinal nerves
(d) the reaction is very rapid
Question 12

There are many instances where a stimulus produces a response but
they do not necessarily involve reflex actions. For example the
stimulus of hunger produces the response to seek food. This is a
voluntary response.
No

Yes.
For example, the ‘knee-jerk’ reflex cannot be
consciously suppressed.

This is true in many cases but not all. The knee-jerk
reflex is a spinal reflex but the reflex change of
shape in the iris of the eye must have a nervous
pathway in the brain.
No

Many reflex actions are rapid but others, such as reflex salivation in
response to a sour taste, are comparatively slow.
Also many voluntary actions are rapid. Some of the reactions in, for
example, badminton are very rapid but they are not reflex actions
No

Question 12
Pepsin, an enzyme in the stomach, will only work
(d) on proteins
(c) at 45ºC
(b) on carbohydrates
(a) in acid conditions
Question 13

The stomach secretes hydrochloric acid as well as
pepsin. The pH is about 2
Yes

An enzyme will act only on one specific
substrate.
Pepsin will not act on carbohydrates
No

At temperatures above 40ºC, most enzymes start to be
denatured. That is, their molecular structure is altered
and they no longer work. Pepsin will work best at body
temperature, 36-37ºC
No

Pepsin acts only on proteins, breaking them down
to smaller molecules called peptides
Yes

Question 13
A sample of food is heated with Benedict’s reagent. If a red
precipitate is formed it shows the presence of
(d) a reducing sugar
(c) glucose
(b) starch
(a) sugar
Question 14

The red precipitate does indicate that a sugar is
present. It does not indicate which one; glucose,
sucrose, fructose etc.
Yes

Starch should not give a red precipitate with Benedict’s
reagent although it may produce a cloudy greenish
suspension. This is because heating with an alkaline
reagent (Benedict’s) starts to break down the starch to
sugar
No

Glucose will certainly form a red precipitate when
heated with Benedict’s reagent but so will several
other sugars; fructose for example.
In practice, the conclusion that glucose is present
would be acceptable.
Yes

This is the best answer. A ‘reducing sugar’ is one
which can ‘reduce’ the copper sulphate in Benedict’s
reagent to copper (1) oxide (the red precipitate).
Glucose, fructose, maltose and lactose are all reducing
sugars
Sucrose is not a reducing sugar and will not produce a
red precipitate with Benedict’s reagent.
Yes

Question 14
The human population grows if
(a) the death rate exceeds the birth rate
(b) the birth rate and death rate increase
(d) the birth rate exceeds the death rate
(c) people live longer
Question 15

If more people are dying than are being born, the population
will diminish
No

If birth rate and death rate both increase, the population
would remain stable but the age structure of the population
would change
No

People living longer could increase the population size
but unless the trend persisted it is unlikely to sustain a
continuing increase in population
No

This is the principal cause of the growth of a population
Yes
RENUEDUCATIONALGROUP

Question 15
The drawings represent stages in cell division in an animal
cell, but in the wrong sequence. Which of the following is the
correct sequence?
a b c d e f g
(d) b, e, a, d, c, g, f
(c) b, e, d, a, c, g, f
(b) b, d, e, a, c, f, g
(a) b, e, d, a, c, f, g
Question 16

Cell constriction (g) occurs before the cells become separated (f)
No

The nucleus divides (e) before the cell starts to constrict (d)
No

This is the correct sequence
Yes

The cell constricts (d) before the cells become separate (a)
No

Question 16
The female sex hormone is produced in
(a) the uterus
(d) the liver
(c) the pituitary gland
(b) the ovaries
Question 17

The uterus does not produce oestrogen
No

Oestrogen is produced in the ovaries
Yes

The pituitary gland releases two hormones. FSH
and LH which affect the ovaries’ production of
hormones but it does not produce oestrogen
No

The liver processes oestrogen prior to its excretion but it does
not produce it.
* In fact the liver does produce small quantities of oestrogen
but these are insignificant compared with oestrogen produced
by the ovaries
No

Question 17
Which of the following are excretory organs?
(d) The alimentary canal
(c) The sweat glands
(b) The kidneys
(a) The liver
Question 18

The liver produces bile. The green bile pigments are breakdown
products of haemoglobin so they are excretory products. But the
production of bile is a response to the presence of food in the
duodenum and bile is not specifically formed to dispose of the bile
pigments. So their excretion is incidental and the liver cannot be
regarded as an excretory organ though it does process some
excretory products which are excreted elsewhere
No

The kidneys are the excretory organs in the body.
They excrete excess water, excess salt, urea and
uric acid and the breakdown products of hormones
and other unwanted products.
Yes

Sweat does contain sodium chloride and urea which can be
regarded as excretory products. However, the sweat glands come
into action in response to a rise in body temperature. The loss of
salt and urea is quite incidental to the sweat glands’ function in
temperature control. Therefore the sweat glands cannot be
regarded as excretory organs.
No

The contents of the alimentary canal have never been part of
the body, so defecation is not excretion. The bile pigments are
excretory products from the liver but their excretion is
incidental to the main function of the alimentary canal
No

Question 18
Sexual reproduction occurs when
(a) a new organism is formed
(c) mating takes place
(d) male and female gametes meet and fuse together
(b) male and female gametes are produced
Question 19

A new organism could be the outcome of sexual reproduction
but asexual reproduction also produces new organisms
No

The production of male and female gametes is an essential step in
sexual reproduction but does not itself constitute sexual
reproduction
No

In certain animals, mating may be a part of sexual reproduction
but sexual reproduction takes place in plants and a great many
other organisms where mating does not occur
No

The fusion of male and female gametes is the
defining moment in sexual reproduction
Yes

Question 19
The evidence and arguments for evolution by Natural Selection are (not in
logical order)…
(a) These variants live longer and have more offspring,
(b) Organisms in a species tend to vary,
(c) Some variants are better adapted to the environment than others,
(d) Therefore there is a struggle for survival,
(e) Organisms have more offspring than can possibly survive,
(f) If the variations are heritable, the variants will eventually predominate,.
Which of the following represents a logical sequence?
(4) e, b, d, c, a, f
(3) e, d, b, c, a, f
(2) b, a, c, d, e, f
(1) b, d, c, a, e, f
Question 20

The fact that organisms vary (b) does not necessitate a struggle for
survival (d)
The fact that organisms have more offspring than can survive (e)
needs to come at an earlier stage in the argument
No

Because organisms vary (b) does not necessarily mean that
they live longer (a). It is only the better adapted variants (c)
which live longer (a)
The tendency to have more offspring than can survive (e) must
come at an early stage in the argument
No

This is the most logical sequence
Yes

This is a reasonable sequence although the struggle for
survival (d) is not necessarily a consequence of variation (b)
Not quite
No

Question 20
The DNA molecule consists of a strand of
(f) nucleotides
(e) protein molecules
(b) deoxyribose and phosphate
(a) the bases, adenine, guanine, thymine
and cytosine

These organic bases are present in the DNA molecule but are
only part of it
No

Deoxyribose and phosphate form the ‘backbone’ of the
molecule but do not constitute it
No

Protein is present in the chromosomes but not in the DNA
No
No

Yes. DNA is made up of a chain of nucleotides
PO4
PO4
bases
Part of a DNA molecule
PO4
PO4
adenine
A nucleotide
deoxyribose
PO4

End of questions
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Quiz no. 2 from RENU EDUCATIONAL GROUP

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