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Animal cell - class-VII

Description: animal cell
Number of Questions: 20
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Tags: biology cell structure and micro-organisms cell structure cell its structure and functions
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Read the different combinations of terms given below. The correct combination of terms with reference to an animal cell is : 

  1. Cell wall, Cell membrane, Nucleus, Plastid

  2. Cell wall, Nucleus, Ribosome, Chromosome

  3. Cell membrane, Ribosome, Mitochondria, Chromosome

  4. Cell membrane, Ribosome, Mitochondria, Chloroplast


Correct Option: C
Explanation:
  • Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles like ribosomes, mitochondria etc. 
  • Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall. 
  • Hence, The correct combination of terms with reference to an animal cell is cell membrane, ribosome, mitochondria, chromosome.
  • So, the correct answer is 'cell membrane, ribosome, mitochondria, chromosome'.

When waters enters the cell, one of the pressure is exerted on the cell wall  

  1. Osmotic pressure

  2. Suction pressure

  3. Turgor pressure

  4. Root pressure


Correct Option: C
Explanation:

When water enters the cell of a plant cytoplasm and exerts an outward pressure and that pressure is called turgor pressure. A cell wall is rigid and flexible therefore exerts an equal and opposite wall pressure against the expanding protoplasm. Thus, turgor pressure becomes equal to the wall pressure when no exchange of water takes place and equilibrium are established.

One of the following is a largest cell.

  1. Human egg

  2. Frog egg

  3. Emu egg

  4. Ostrich egg


Correct Option: D
Explanation:

Multicellular eukaryotes have a cell size in the range of 5 to 100$\mu$m. Largest cells are animal eggs. Largest egg of a land animal is that of ostrich (17 cm x 15 cm), while for an aquatic animal, it is that of whale shark (30 cm in diameter).

Thus, the correct answer is option D.

Animal cells have larger vacuoles as compared to plants.

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient


Correct Option: B
Explanation:

Plants don't have excretory system, thus possess larger vacuole to store their waste metabolites. Whereas animals have comparatively smaller vacuoles used for storage's of food materials.

Layer of actively dividing cells in skin of frog is termed as stratum




  1. Malpighi

  2. Corneum

  3. Compactum

  4. Spongiosum


Correct Option: A
Explanation:

The cells of stratum malpighi of frog are continue growing and divide mitotically throughout life to form new layer being pushed towards the surface successively.

How many types of cells in human body are known, based on the tissues they form?

  1. Six

  2. Seven

  3. Eight

  4. Four


Correct Option: C
Explanation:

Human body has eight type of cells based on the tissues formed by them. They are as followed:

1) Bone cells known as osteocytes helps in the formation of bone which is a connective tissue.
2)  Cartilage cells helps in the formation of flexible cartilage and provides flexibility to parts like auricle.
3)  Nerve cells forms the nervous system and helps in transmission of nerve signal.
4) Epithelial cell forms the covering of other cells. It also helps in wear and tear mechanism.
5)  Muscle cells are present in the muscle tissue. It is rich in actin and myosin and help in muscle contraction.
6) Secretory cell form glands and secrete hormones, oil and enzymes. For example, pancreatic cells which secrete insulin, glucagon, salivary gland secrete salivary amylase, sebaceous gland secrete oil on the skin etc.They are found in all secretory organs.
7)  Adipose cells forms adipose tissue and helps in storage of fat.
8) Blood cells include RBC’s, WBC, Thormbocytes etc. RBC carry haemoglobin and helps in respiration. WBC plays active role in defensive mechanism and thromocytes helps in blood clotting with the help of thromboplastin.
So, the correct answer is option C.

The finger-like projections which increase the surface area in the small intestine are called ..........

  1. Pseudopodia

  2. Villi

  3. Lumen

  4. None of the above


Correct Option: B
Explanation:

  • Pseudopodia are temporary protrusions that are filled with cytoplasm within the eukaryotic amoeboid cells and unicellular protists. Pseudopodia, also called as "false foot" are majorly used for movement and ingestion of food, nutrients and other particulate matter.
  • Villi are the finger-like projections within the small intestine that help in the absorption of nutrients from the digested food by increasing the surface are of intestine walls.
  • Lumen is the inside space of the gastrointestinal tract, through which the food is transported while digesting from mouth to anus.
Thus the correct answer is 'Villi'.

Which of the following structures helps you to determine that it is not an animal cell?

  1. Cell wall and Vacuole

  2. Mitochondria and Ribosome

  3. Ribosomes and Lysosomes

  4. Plasma membrane


Correct Option: A
Explanation:

Plant cell is surrounded by cell wal while the animal cell is starts with plasma membrane. The vacuoles are dispersed in animal cell while the plant cell has a large central vacuole.

So, the correct answer is option A.

An animal cell placed in pure water will

  1. Swell up and burst

  2. Shrink and die

  3. Shrink and undergo plasmolysis

  4. Swell up and develop turgidity


Correct Option: A
Explanation:

When animal cells are placed in pure water (Which is as good as a hypotonic solution) they will take in water due to osmosis. The intake of water will make the cells swell up and eventually burst as the cell membrane is weak and it is unable to take the pressure.
Thus, the correct answer is option A.

Thread like protoplasmic projections found on free surface of absorptive cells are

  1. Cilia

  2. Microfilaments

  3. Microvilli

  4. Plasmodesmata


Correct Option: C
Explanation:

Microvilli are microscopic cellular membrane protrusions that increase the surface area of cells and are involved in a wide variety of functions including absorption, secretion, cellular adhesion and mechanotransduction.

Functional units of food absorption are

  1. Villi

  2. Brunners glands

  3. Crypts of Lieberkuhn

  4. Peyers patches


Correct Option: A
Explanation:
The villi and microvilli, with their many folds with finger-like projection, present on the lining of the small intestine, increase the surface area of the intestine for more absorption of the nutrients. The microvilli have protein channels and pumps in their membranes to allow the rapid absorption of food by facilitated diffusion and active transport. Also, the villi contain an epithelial layer, which is only one cell layer thick so that food can pass through easily and be absorbed quickly. This thin layer of cells contains mitochondria to provide the ATP needed for the active transport of certain food molecules. Finally, there is a lacteal branch at the centre of the villus, which carries away fats after absorption.
So, the correct answer is option A.

Lysosomes are absent in animal cells

  1. Erythrocytes

  2. Plasma cells

  3. Nerve cells

  4. Muscle cells


Correct Option: A
Explanation:
  • The Red blood cells do not contain lysosomes, mitochondria, nucleus etc.
  • The absence of cellular organelles help them to accommodate maximum space for haemoglobin and helps in carrying more oxygen.
  • It also gives a distinctive bi-concave shape to these cells and also helps in diffusion.
  • So, the correct answer is 'Erythrocytes'.

Which of the following terms relate to an animal cell?

  1. No cell wall

  2. Cell membrane

  3. Nucleus

  4. All of the above


Correct Option: D
Explanation:

Animal cell lacks a cell wall, that is why it has no particular shape. It has other organelles like cell membrane and nucleus inside its cell.

State whether the following statement is true (T) or False (F) :
All animal cell contain a cell wall.

  1. True

  2. False


Correct Option: B
Explanation:

Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall.

Therefore the statement is false. 

Given below are types of cells present in some animals. Which of the following cells can differentiate to perform different functions?

  1. Choanocytes

  2. Interstitial cells

  3. Gastrodermal cells

  4. Nematocytes


Correct Option: B
Explanation:

Interstitial cells are reserve cells which can differentiate into any type of cells. Nematocytes are stinging cells used for offence and defence. Gastrodermal cells line the gastrodermis and intracellular digestion takes place inside these cells. All these cells are found in cnidarians. Choanocytes are found in sponges; they are specialised flagellated cells that line spongocoel and canals.

So, the correct answer is 'Interstitial cells'

A scientist was studying the production of a protein that was released by an animal cell into a culture medium. She found that the protein only appeared in the culture medium after she added a few drops of a hormone to the cell. Before adding the hormone, she labelled the protein inside the cell with a fluorescent dye and looked at the cell under the light microscope. The dye was seen in flattered sheets and tube-like structures throughout the cell, and in stacks of flattened sac-like structures. After adding the hormone, the dye was also seen as small dots clustered against the cell membrane. Which statement most likely explains these observations?

  1. The hormone stimulates protein synthesis in the cell vacuole, the protein is then passed to the Golgi apparatus, and eventually passes through the cell membrane by passive diffusion

  2. The hormone triggers the synthesis of the protein in the endoplasmic reticulum and it is then secreted outside of the cell via channel proteins in the cell membrane

  3. The protein is made in the endoplasmic reticulum, is passed to the Golgi apparatus and is secreted through hormone-stimulated exocytosis

  4. The protein is made in the Golgi apparatus is passed to the endoplasmic reticulum and is secreted through hormone-stimulated pinocytosis


Correct Option: C
Explanation:

Hormones bring about their characteristic effects on target cells by modifying cellular activities. The given experiment shows that the hormone is a releasing hormone which has increased the secretion of protein product in the target cell.

Which of the following is not common in chloroplasts & mitochondria?

  1. Both are present in animal cells

  2. Both contains their own genetic material

  3. Both are present in eukaryotic cells

  4. Both are present in plant cells


Correct Option: A
Explanation:

The similarities in chloroplasts and mitochondria are 

1. Both are present and animal cells
2. Both are present in eukaryotic cells and have own genetic material
They are not present in animal cells.
So, the correct option is 'Both are present in animal cells'.

Which of the following is a type of intercellular junction between animal cells?

  1. Middle lamella

  2. Plasmodesma

  3. Desmosome

  4. Glycocalyx


Correct Option: C
Explanation:

Desmosomes are circular regions where adjacent membranes possess disc-shaped thickening on the inner side, a number of tonofibrils and transmembrane linkers embedded in the dense intercellular material. Desmosomes act as 'spot welds' and keep the cells firmly together. They occur in epithelia subjected to disruption. 

Plasmodesma is protoplasmic bridge amongst plant cell wall which occur in the areas of cell wall pits or pores.
Middle lamella is a layer of cell wall and cell wall is absent in an animal cell.
Therefore, the correct answer is option C.

You will not find a cell wall in which of these kinds of organisms?

  1. Fungi

  2. Animal

  3. Plants

  4. All of the above


Correct Option: B
Explanation:

Plants, fungi, some protozoa and some bacteria unlike animal cells have a distinct structure called a cell wall.

Which of the following cells are present in the endoderm of Hydra, but not in epidermis ?

  1. Cnidoblasts and interstitial cells

  2. Glandular cells and endothelio-muscular nutritive cells

  3. Cnidoblasts and germ cells

  4. Interstitial cells and sensory cells


Correct Option: A
Explanation:

  • Stinging cells or nematocyst are present on the outer region of the body as small swellings and are hence a part of the epidermis.
  •  The germ cells are also a part of the ectodermal epithelium.
So, the correct answer is 'Stinging cells and germ cells'.

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