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NEET • BIOLOGY • CELL-THE UNIT OF LIFE

Cell-the unit of life practice · Mixed difficulty

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151 Medium

151 of 219

Remembering +4 | -1

Pits are formed on the cell wall is due to lack of

View answer and explanation

Correct option: C

Secondary wall material

Option C (Secondary wall material) is correct because pits are thin areas in the secondary cell wall where the secondary wall material is absent, allowing for communication between adjacent cells.

152 Medium

152 of 219

Analyzing +4 | -1

Find the incorrect pair w.r.t membrane transport

View answer and explanation

Correct option: A

Neutral solute – facilitated diffusion

Option A (Neutral solute – facilitated diffusion) is the incorrect pair because neutral solutes can also move via simple diffusion, not just facilitated diffusion.

153 Medium

153 of 219

Remembering +4 | -1

Prokaryotic cells are generally….. and multiply more rapidly than the eukaryotic cells

View answer and explanation

Correct option: B

Small

Option B (Small) is correct because prokaryotic cells are generally smaller than eukaryotic cells, allowing for faster reproduction.

154 Medium

154 of 219

Understanding +4 | -1

Cell membrane controls

View answer and explanation

Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because the cell membrane regulates both exocytosis and endocytosis, which are processes of substance movement.

155 Medium

155 of 219

Remembering +4 | -1

Wall of eukaryotic cell (fungus) is made up of a polymer of

View answer and explanation

Correct option: B

\mathrm{\beta }

, 1-4 acetyl glucosamine

Option B (

\mathrm{\beta}

, 1-4 acetyl glucosamine) is correct because the cell wall of fungi is primarily composed of chitin, which is a polymer of N-acetylglucosamine linked by

\beta

-1,4-glycosidic bonds.

156 Hard

156 of 219

Remembering +4 | -1

A widely accepted, improved model of cell membrane is

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Correct option: A

Fluid mosaic model

Option A (Fluid mosaic model) is correct because it is the most widely accepted and improved model of the cell membrane.

157 Medium

157 of 219

Understanding +4 | -1

Difference between prokaryote and eukaryote is in

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Correct option: D

Organisation of nuclear material

Option D (Organisation of nuclear material) is correct because the presence or absence of a nuclear membrane is the defining difference between prokaryotes and eukaryotes.

158 Easy

158 of 219

Analyzing +4 | -1

Read the following statements:

I. Eukaryotic plant cell walls contain peptidoglycans in addition to cellulose.

II. Plasmodesmata and centrioles are found in all plant cells.

III. Plant cell contains 80S ribosomes which they use to manufacture proteins.

IV. Amyloplasts are a type of plastids found in a plant cell that help so store carbohydrates.

Identify the statements that are INCORRECT regarding plant cell.

View answer and explanation

Correct option: A

I and II only

Option A (I and II only) is correct because statement I is wrong (plant cell walls do not contain peptidoglycans) and statement II is also wrong (centrioles are not found in all plant cells).

159 Easy

159 of 219

Remembering +4 | -1

…A… are granular structures first observed under electron microscope as dense particles by …B… (1953). Here, A and B refer to

View answer and explanation

Correct option: D

A-Ribosomes; B-George Palade

Option D (A-Ribosomes; B-George Palade) is correct because ribosomes are granular structures first observed under the electron microscope as dense particles by George Palade in 1953.

160 Medium

160 of 219

Remembering +4 | -1

Vital stains are employed to study

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Correct option: A

Living cells

Option A (Living cells) is correct because vital stains are used to observe structures and processes within living cells without killing them.

161 Medium

161 of 219

Understanding +4 | -1

Unicellular organisms are

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Correct option: C

Capable of independent existence and can perform all the essential vital functions

Option C is correct because unicellular organisms can perform all life functions independently.

162 Hard

162 of 219

Remembering +4 | -1

Muramic acid is present in the cell wall of

View answer and explanation

Correct option: A

Bacteria

Option A (Bacteria) is correct because muramic acid is a unique component of the peptidoglycan layer in bacterial cell walls.

163 Medium

163 of 219

Application +4 | -1

Observe the following functions of the cell.

• Synthesis of protein and enzymes

• Synthesis of lipids

• Synthesis on Glycolipids

• Enzymes optimally active in acidic pH.

Arrange the given cell organelles with their respective functions,

(A) Golgi apparatus

(B) Rough endoplasmic reticulum

(C) Smooth Endoplasmic reticulum

(D) Lysosome

(E) Ribosome

(F)Mitochondria

Options:

View answer and explanation

Correct option: D

E, C, A, D

Option D (E, C, A, D) is correct because it accurately matches each organelle with its primary function: Ribosome-Protein synthesis, SER-Lipid synthesis, Golgi-Glycolipid synthesis, Lysosome-Acidic pH enzymes.

164 Easy

164 of 219

Remembering +4 | -1

Most of the bacterial cell envelope consists of

View answer and explanation

Correct option: B

A tightly bound three layered structure

Option B (A tightly bound three layered structure) is correct because the bacterial cell envelope typically consists of the glycocalyx, cell wall, and cell membrane.

165 Medium

165 of 219

Understanding +4 | -1

The factors which set the limit of cell size or volume are
I. nucleo-cytoplasmic or kern-plasma ratio
II. rate of metabolic activity
III. ability of oxygen and other materials to reach every part of the cell
IV. ability of waste products to pass to the outside
V. ratio of surface area to the volume of the cell
Identify the correct set of statements

View answer and explanation

Correct option: D

I, II, III and IV

Option D (I, II, III and IV) is correct because all the listed factors (nucleo-cytoplasmic ratio, metabolic activity, oxygen/material diffusion, waste removal) limit cell size or volume.

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166 Hard

166 of 219

Remembering +4 | -1

Histone proteins are rich in

View answer and explanation

Correct option: B

Arginine and lysine

Option B (Arginine and lysine) is correct because histone proteins are rich in the basic amino acids arginine and lysine, which contribute to their positive charge and interaction with negatively charged DNA.

167 Easy

167 of 219

Understanding +4 | -1

Diameter of DNA is constant due to

View answer and explanation

Correct option: A

Hydrogen bonds between base pairs

Option A (Hydrogen bonds between base pairs) is correct because hydrogen bonds between complementary base pairs (A-T, G-C) maintain the constant diameter of the DNA double helix.

168 Hard

168 of 219

Understanding +4 | -1

[A]: Calcium carbonate crystals are callec cystoliths.

[R]: The main body of a cystolith is a cellulose extension of cell wall in which calcium carbonate is deposited.

View answer and explanation

Correct option: A

Both A and R are true and R is the correct explanation of A

Option A is correct because cystoliths are indeed calcium carbonate crystals, and they form within a cellulose matrix inside plant cells.

169 Easy

169 of 219

Understanding +4 | -1

Channel proteins are involved in

View answer and explanation

Correct option: D

Passive transport of ions

Option D (Passive transport of ions) is correct because channel proteins facilitate the movement of ions across the cell membrane down their concentration gradient, which is a form of passive transport.

170 Medium

170 of 219

Understanding +4 | -1

A. All secondary constrictions are stainable

R. Plasmasomes are produced by primary constrictions of the chromsomes

View answer and explanation

Correct option: D

Both (A) and (R) are false

Option D (Both (A) and (R) are false) is correct because not all secondary constrictions are stainable, and plasmasomes are produced by secondary constrictions, not primary constrictions.

171 Hard

171 of 219

Remembering +4 | -1

Cell organelles extracted from endosperm of germinating castor beans are?

View answer and explanation

Correct option: A

Glyoxysomes

Option A (Glyoxysomes) is correct because glyoxysomes are specialized peroxisomes found in plant cells, particularly in the endosperm of germinating seeds, where they convert stored fats to carbohydrates.

172 Medium

172 of 219

Analyzing +4 | -1

Which of the following is the odd one out?

View answer and explanation

Correct option: D

Tobacco mosaic virus

Option A (Mitochondria) is correct because it is a cell organelle, while the others are viruses.

173 Medium

173 of 219

Remembering +4 | -1

In eukaryotes, photosynthesis occurs in

View answer and explanation

Correct option: A

Chloroplast

Option A (Chloroplast) is correct because chloroplasts are the organelles in eukaryotic cells where photosynthesis takes place.

174 Medium

174 of 219

Remembering +4 | -1

Robert Hooke developed a microscope with which he studied the internal structures of the cell. His work is famous for the study of

View answer and explanation

Correct option: A

Cork cells

Option A (Cork cells) is correct because Robert Hooke's observation of cork cells led to the term \"cell.\"

175 Hard

175 of 219

Remembering +4 | -1

Streaming of cytoplasm within a living cell is

View answer and explanation

Correct option: B

Cyclosis

Option B (Cyclosis) is correct because cyclosis refers to the streaming or circulation of cytoplasm within a cell.

176 Medium

176 of 219

Remembering +4 | -1

Structural lipids of cell membrane are

View answer and explanation

Correct option: D

Phospholipids

Option D (Phospholipids) is correct because phospholipids are the primary structural lipids that form the bilayer of cell membranes.

177 Hard

177 of 219

Understanding +4 | -1

Statement I: Green chillies turn red when ripe

Statement II: During ripening of chillies the chloroplasts transform into chromoplasts

View answer and explanation

Correct option: A

Both Statement I and II are correct

Both Statement I and II are correct because green chillies do turn red when ripe, and this color change is due to the transformation of chloroplasts into chromoplasts during ripening.

178 Medium

178 of 219

Remembering +4 | -1

Centrosome is not present in

View answer and explanation

Correct option: A

Cell of higher plants

Option A (Cell of higher plants) is correct because higher plants lack centrosomes; their microtubules organize around the nuclear envelope during cell division.

179 Hard

179 of 219

Remembering +4 | -1

Cell junctions that prevent the leakage of substances across a tissue are

View answer and explanation

Correct option: A

Tight junctions

Option A (Tight junctions) is correct because tight junctions form a seal between cells, preventing the leakage of substances across a tissue.

180 Easy

180 of 219

Understanding +4 | -1

The membrane potential of cell favours the

View answer and explanation

Correct option: A

Movement of cations into the cell

Option A is correct because the negative membrane potential attracts positively charged cations into the cell.

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Cell-the unit of life practice · Mixed difficulty

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