quiz no. 2 from renu educational group

RENU EDUCATIONAL GROUP

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 . OKR 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.



Since the allele for black is dominant, all the offspring will be black





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 7After 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



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 19The 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

End show

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quiz no. 2 from renu educational group

Education

verma question

verma test

enzymes question

fatty acids question

cytoplasm question

amino acids b glucose

fatty acids d glucose

c glucose