Tag: levels of organisation in plants

Quizzes (0) Questions (65)

Questions Related to levels of organisation in plants

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.

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

Choose the correct answers from the alternatives given.
When a plant cell is placed in pure water, it will

  1. Become rigid because of turgor pressure

  2. Lose water and wilt

  3. Swell and burst

  4. Alter its cell wall composition so that it becomes impermeable to water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pure water is a hypotonic solution that causes endosmosis. The water diffuses into the cell causing the cytoplasm to build up pressure against the wall. This pressure is called turgor pressure that causes rigidity of the cell and the cell does not burst. This turgor pressure is responsible for the enlargement and extension of the cells during growth.

Hence, the correct answer is 'Become rigid because of turgor pressure'.

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

Select the wrong statement with respect to the structure of a plant cell.

  1. Cellulosic cell wall is present inside the cell membrane

  2. Centrioles are usually absent

  3. A large central vacuole is present

  4. Golgi apparatus is formed of a number of unconnected units called dictyosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cell wall is the outer rigid protective and supportive covering of plant cells, fungi and some protists. Cell membrane is covering of protoplasm which occurs inside the cell wall. In plants the cell wall is made of cellulose.

So, the correct answer is 'Cellulosic cell wall is present inside the cell membrane'

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

Angiotensinogen is a protein produced and secreted by ________________.

  1. Juxtaglomerular (JG) cells

  2. Macula densa cells

  3. Endothelial cells (cells lining the blood vessels)

  4. Liver cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Angiotensinogen is a αα - globulin protein produced by liver cells. Renin changes angiotensinogen to angiotensin II (hormone) in response to fall in glomerular blood flow/glomerular blood pressure/GFR. Angiotensin II increases blood pressure and blood volume.