Cell - The Fundamental Unit of Life Test

Result

Cell - The Fundamental Unit of Life Test - 3

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements are true about endoplasmic reticulum?

(a) Smooth endoplasmic reticulum makes lipids.
(b) It is also called the control centre of the cell.
(c) RER has ribosomes attached to its surface.
(d) It modifies chemicals that are toxic to the cell.

A
(a), (b) and (c)

B
(a), (c) and (d)

C
Only (a) and (d)

D
All of the above

Solution

Endoplasmic reticulum has two components: rough and smooth, based on the presence and absence of ribosomes. RER has ribosomes attached to its surface and hence, is responsible for the formation of proteins. SER is concerned with the synthesis of lipids. ER also helps in detoxification of toxins and drugs.
Question 2
1 / -0

Which of the following is true for a plasma membrane?

A
It helps in protein synthesis.

B
It regulates the passage of water only into and out of the cell.

C
It regulates the passage of water and dissolved substances into and out of the cell.

D
It helps in energy production in eukaryotes.

Solution

Plasma membrane does not help in protein synthesis. It is done by ribosomes. Plasma membrane regulates the movement of water and dissolved salts in and out of the cells. Hence, it is semi-permeable. Mitochondria is the organ involved in energy production.
Question 3
1 / -0

Which of the following cell constituents cannot be seen while observing a human cheek cell?

A
Nucleus

B
Cell membrane

C
Cytoplasm

D
Cell wall

Solution

Cell-wall is the characteristic feature of plant, fungal and bacterial cells. It is not present in animal cells, like human cheek cells.
Question 4
1 / -0

Which of the following is true for proteins that are secreted by cells?

A
They are not synthesised in ribosomes that are bound to endoplasmic reticulum.

B
They are synthesised in the mitochondria.

C
They are packed in the golgi apparatus.

D
They move across the cell membrane by phagocytosis.

Solution

The proteins are synthesised in the RER. These are then transported to the golgi apparatus, where these are modified and processed as required.
Question 5
1 / -0

The nucleolus helps in the formation of

A
lysosomes

B
ribosomes

C
peroxisomes

D
centrosomes

Solution

The nucleolus is a round body located inside the nucleus of a eukaryotic cell. It is not surrounded by a membrane, but sits in the nucleus. The nucleolus makes ribosomal sub-units from proteins and ribosomal RNA, also known as rRNA.
Question 6
1 / -0

Mitochondria and chloroplasts are similar because

A
both have nuclei

B
both have 80S ribosomes

C
both have DNA

D
both have single membrane envelope

Solution

Both DNA and chloroplasts are semi-autonomous organelles. Both of them possess their own DNA and 70S ribosomes. Hence, these organelles can synthesise their own proteins.
Question 7
1 / -0

The cell organelle storing substances like starch, oil and proteins is

A
vacuole

B
lysosome

C
plastid

D
golgi body

Solution

Plastids are of two types: Chromoplasts and Leucoplasts. Leucoplasts are concerned with storage. The following are examples of leucoplasts: Amlyloplast: It stores starch and is found in tubers, cotyledons and endosperm.
Elaioplast: It stores oil and is found in the epidermal cells.
Proteinoplast: It stores protein and is found in seeds and nuts.
Question 8
1 / -0

The lipids and proteins essential for the formation of cell membrane are synthesised in

A
golgi bodies

B
mitochondria

C
endoplasmic reticulum

D
lysosomes

Solution

Endoplasmic reticulum consists of SER and RER. RER is concerned with the formation of proteins and SER is responsible for the synthesis of lipids.
Question 9
1 / -0

Plasmolysis in a plant cell is defined as

A
break down of plasma membrane in hypotonic solution

B
shrinkage of protoplasm in hypertonic medium

C
shrinkage of nucleoplasm

D
break down of nuclear membranes

Solution

Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell.
Question 10
1 / -0

The amount of DNA doubles during which phase of the cell cycle?

A
G1 phase

B
G2 phase

C
S phase

D
M phase

Solution

S phase (synthesis phase) is the part of the cell cycle in which DNA is replicated. It occurs between G1 phase and G2 phase.
Question 11
1 / -0

Meiosis can be best studied from which of the following tissues?

A
Root tip

B
Shoot apex

C
Xylem

D
Anther lobes

Solution

Meiosis takes place in sex cells. Anther lobes are the male reproductive parts of the flower. Anther lobes produce pollen grains which can be used to study meiosis.
Question 12
1 / -0

Directions For Questions

...view full instructions

The above figure gives three characteristics of X. Choose the correct sentence about X from among the following:

A
X exhibits less adaptability.

B
Death of one cell kills the whole X.

C
Division of labour is more prominent in X.

D
Amoeba and paramecium are examples of X.

Solution

In X, more than one cell is present, cells are differentiated and X is larger in size. Thus, X refers to a multi-cellular organism. Multi-cellular organisms work more efficiently due to division of labour.
Question 13
1 / -0

Read the following sentences and choose the correct option.

A (Assertion): Smaller cells are more effective in transporting materials.
R (Reason): Smaller cells have high surface to volume ratio.

A
Both A and R are true but R does not explain A.

B
Both A and R are true and R is correct explanation of A.

C
A is true but R is false.

D
R is true but A is false.

Solution

Both A and R are true and R is correct explanation of A. Smaller cells are more effective in transporting materials because they have high surface to volume ratio. The surface area to volume ratio of a cell affects the efficiency of diffusion. The surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell grows beyond a certain limit, efficient transportation cannot occur across the membrane will not occur.
Question 14
1 / -0

Directions For Questions

...view full instructions

Observe the above figure of nucleus and choose the incorrect answer.

A
A carry units for inheritance.

B
B is selectively permeable.

C
C is the control center of the activities of the cell.

D
A can be seen only when cell divides.

Solution

C is nucleolus and it is a small spherical body present in the nucleus. Nucleus as whole control the activities of the cell.
Question 15
1 / -0

Directions For Questions

...view full instructions

Refer to the Venn diagram given above and choose the incorrect answer about A, B and C.

A
Set A consists of a protection providing structure.

B
Set C does not contain any structure with green pigments.

C
Set B includes control center of the cell.

D
Set B does not consist of structures that define shape of the cell.

Solution

Set B consists of all structures common to plant and animal cells. As the structures that defines the shape of the cell, i.e. cell membrane is common to both plant and animal cells, set B consists of structures that define the shape of the cell.
Question 16
1 / -0

Directions For Questions

...view full instructions

Refer to the above diagram and choose the incorrect option.

A
A is made up of cellulose.

B
C performs photosynthesis.

C
B is selectively permeable

D
D are absent in animal cells.

Solution

C is the nucleus of cell. Nucleus controls all the activities of the cell but does not perform photosynthesis.
Question 17
1 / -0

Directions For Questions

...view full instructions

The above diagram gives three characteristics of X. Choose the sentence(s) which is/are correct for X.

a. X is only present in the leaves.
b. X is a type of plastid.
c. X is a non-membranous structure.
d. X contains chlorophyll.

A
b and d

B
c and a

C
Only b

D
Only d

Solution

X is necessary for photosynthesis, imparts green colour to leaves and has ability to capture sunlight. Thus, X refers to chloroplast. Chloroplast is a type of green coloured plastid and contains chlorophyll for capturing sunlight.
Question 18
1 / -0

Which of the following organelles is/are surrounded by a single membrane?

A
Mitochondria

B
Nucleus

C
Lysosome

D
Plastid

Solution

This is correct. Lysosomes are surrounded by a single membrane.
Question 19
1 / -0

Why are capsicums and tomatoes red/yellow in colour?

A
They obtain that colour upon ripening.

B
They are hybrids.

C
They contain chromoplasts, which impart them colour.

D
They have choloroplasts, which imparts them colour.

Solution

Capsiums and tomatoes are red in colour due to the presence of different pigments like xanthophyll and carotenoids. These pigments are present in chromoplasts and are responsible for imparting colours like orange and yellow.
Chloroplasts are the plastids responsible for imparting green colour to various plant parts.
Question 20
1 / -0

During prophase, the chromosomes split into _________, which are joined at __________.

A
centrioles; aster rays

B
homologous chromosomes; aster rays

C
sister chromatids; centromere

D
spindle fibres; centromere

Solution

During prophase, the chromosomes are divided as shown below: