Tag: plant and animal cell

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Questions Related to plant and animal cell

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

A plant cell placed in $0.7\,M$ sugar solution was found with no change in cell volume. If the same plant cell is placed in $0.7\,M$ of $NaCl$ solution , then there will be

  1. No change in cell volume

  2. Increase in cell volume

  3. Decrease in cell volume

  4. initial increase and eventually decrease in cell volume
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A plant cell shows no volume change in 0.7 M sugar solution because it is isotonic. When placed in 0.7 M NaCl solution, which dissociates into ions, the effective concentration (osmolarity) becomes higher than the cell interior, making the solution hypertonic. Water flows out of the cell, leading to plasmolysis and a decrease in cell volume.

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

Planet cells that are photosynthetically  active are found in the ______ layer of leaf and are ____ cells.

  1. Epidermis ,Parenchymatous

  2. Mesophyll,Parenchymatous

  3. Mesophyll, Sclerenchymatous

  4. Aerenchyma,Collenchymatous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photosynthetically active plant cells are primarily parenchymatous cells containing chloroplasts, collectively forming the chlorenchyma tissue found in the mesophyll layer of leaves. Epidermal cells generally lack chloroplasts, and sclerenchymatous cells are dead and provide structural support.

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

Which is incorrect for chloroplast

  1. Presence in algae and plants
  2. Release $O _2$

  3. Occurs only in cells with aerobic respiration

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chloroplasts are found in photosynthetic organisms and do not require aerobic respiration to function; they are the site of photosynthesis, which is independent of the cell's respiratory state.

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

In plant cell, the vacuole

  1. Contains air and lacks membrane

  2. Contains water and excretory substances but lacks membrane

  3. Contains storage protein and lipids and is membrane bound

  4. Is membrane bound, contains water and excretory substances.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In plant cells, the large central vacuole is bound by a membrane called the tonoplast and contains cell sap, which includes water, ions, and various excretory substances.

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

Chloroplast contains maximum quantity of _________________.

  1. Pyruvic carboxylase

  2. Hexokinase

  3. RUDP caboxylase

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pyruvate carboxylase is a mitochodrial enzyme that catalyzes carboxylation of pyruvate into oxaloacetate. Hexokinase is an enzyme of glycolysis and is present in the cytoplasm. RUBP carboxylase catalyzes carboxylation of RuBP during photosynthetic carbon fixation. Chloroplasts is the site of photosynthesis and contain maximum quantity of RUBP carboxylase. The correct answer is C.

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

In a chloroplast, what is the ration of chl a : chl b and carotenes : xanthophylls respectively?

  1. 3 : 1 and 2 : 1

  2. 2 : 1 and 3 : 1

  3. 3 : 2 and 1 : 1

  4. 1 : 1 and 3 : 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • A chloroplast is the site of photosynthesis, it contains all the pigments required for the process of photosynthesis. Pigments are of two types: Chlorophylls and Carotenoids.
  • Chlorophylls are the green photosynthetic pigments, they are of mainly five types - chlorophyll a, b, c, d, and e. The amount of chlorophyll b is one-fourth of the total chlorophyll content while chlorophyll a is the universal or primary photosynthetic pigment and present in abundance.
  • Carotenes are hydrocarbons, they may be yellow, brown or reddish pigments.
  • Xanthophylls are oxygen-containing carotenes, yellowish brown in color.
So, the correct option is '3: 1 and 2: 1'.

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

Dye injected into a plant cell might be able to enter an adjacent cell through _______.

  1. microtubule

  2. microfilament

  3. plasmodesmata

  4. tight junction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plasmodesmata are cytoplasmic bridges between adjacent plant cells which develop in minute pores of their walls. They form protoplasmic continuum called symplast. It provides channels for controlled passage of small sized particles between adjacent cells as well as transfer of some specific signals.