Tag: plant and animal cell

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Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Which of the following statements is true about the plant cell?

  1. The cytoplasm is filled up with nucleus.

  2. The cytoplasm is a jelly-like mixture of cellulose.

  3. Plant cells contain a rigid cell wall made up of cellulose.

  4. There are plenty of chloroplast granules in plant root cells.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cellulose forms an integral part of the cell wall which provides strength and rigidity to the cell. It helps to maintain the structural integrity of a particular cell. Cellulose is a complex polysaccharide which is made up of β(1→4) linked D-glucose units.

Thus, the correct answer is option C. 

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Which of the following is correct in plant cell?

  1. Bigger vacuole with rigid cell wall.

  2. Centriole takes part in cell division.

  3. Centrosome are inactive in non-dividing cell.

  4. Absence of cell membrane.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vacuoles are found in almost all the cells. A plant cell usually has a large central sap vacuole. Most mature plant cells have one large vacuole that typically occupies more than 30% of the cell's volume, and that can occupy as much as 80% of the volume for certain cell types and conditions. Another important characteristic of a plant cell is the presence of a cellulosic cell wall. The plant cell wall is dead at maturity and is rigid. Hence, cell wall provides support and maintains the shape of a plant cell.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

A plant cell placed in pure water will

  1. Swell up and become turgid

  2. Swell up and burst

  3. Lose water and become flaccid

  4. Shrink and die
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plant cells have a strong cell wall surrounding them. When they take up water by osmosis they start to swell, but the cell wall prevents them from bursting. As a result, the plant cells become “turgid” when they swell up and become turgid.

Thus, the correct answer is option (A). 

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Plant cells store fat in

  1. Peroxisome

  2. Lysosome

  3. Sphaerosome

  4. Microsome

  5. Microphage
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Plant cells store fat in sphaerosome.
  • Spherosomes or oleosomes can be defined as small cellular organelles found in plant cells that are enclosed by a single membrane. 
  • It is mainly responsible for the storage and synthesis of lipid. 
  • They are obtained from the endoplasmic reticulum and are surrounded by a phospholipid monolayer.
  • So, the correct answer is 'Sphaerosome'.
Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

A plant (cell) having more than two nuclei is known as

  1. Syncytial

  2. Coenocyte

  3. Polynucleate

  4. <p>Plasmodium</p>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • A plant cell having more than two nuclei is known as coenocyte.
  • Coenocyte refers to a multinucleate condition of the cell (algae, fungi or plant) which occurs due to the multiple nuclear divisions which are not followed by cytokinesis.
  • So, the correct answer is 'Coenocyte'.
Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Match the following and find the correct combination.

(a) Cellulose (i) Cell wall of bacteria
(b) Chitinase (ii) Cell wall of plant cells
(c) Lysozyme (iii) Proteins
(d) Protease (iv) Cell wall of fungal wall
(v) RNA

  1. a-ii, b-iv, c-i, d-iii

  2. a-ii, b-i, c-iv, d-iii

  3. a-v, b-i, c-iii, d-ii

  4. a-v, b-iv, c-i, d-ii
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cellulose is found in plant cell walls (a-ii), Chitinase breaks down chitin in fungal walls (b-iv), Lysozyme breaks down bacterial cell walls (c-i), and Protease breaks down proteins (d-iii).

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

Consider the following statements.
a. In plant cells, cytokines is starts with the formation of the phragmoplast.
b. Phragmoplast comprises interozonal microtubules and Golgi vesicles.
c. Primary cell wall is produced by microtubules.
Which of the statements are correct?

  1. $1$ and $3$
  2. $1$ and $2$
  3. $2$ and $3$
  4. $1, 2$ and $3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In plant cell division, cytokinesis typically starts with the formation of a phragmoplast, which comprises interzonal microtubules and Golgi vesicles. The primary cell wall is deposited later or formed during the process, but statement 3 regarding the primary cell wall being produced directly by microtubules in this context is not standard or part of the classic paired correct statements. Thus statements 1 and 2 are correct.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

In a plant cell, DNA is present _______________.

  1. Only in chromosomes

  2. In chromosomes and chloroplasts

  3. In chromosomes, chloroplasts and mitochondria

  4. In chromosomes, chloroplasts mitochondria and ribosome's
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

DNA is found in the nucleus (chromosomes), as well as in semi-autonomous organelles like chloroplasts and mitochondria, which contain their own circular DNA. Ribosomes are composed of RNA and proteins, not DNA.

Multiple choice biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

The plant cells wall in a cross-section appears to be made up of many layers due to the.

  1. Presence of large amount of cellulose in the wall

  2. Presence of lignin which prevents the folding cellulose micro fibrils

  3. Presence of different composition and structure of the lamellae which are added continuously as the wall grows

  4. Orientation of micro fibrils in the different lamellose of the wall that result in differences in the refraction of light so that layers of the wall are emphasized
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plant cell walls appear layered in cross-section because the cellulose microfibrils in different lamellae are oriented in varying directions during growth, causing optical differences in light refraction that highlight distinct layers.