Tag: life processes in living organisms- part 1

Quizzes (20) Questions (81)

Questions Related to life processes in living organisms- part 1

Multiple choice botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

In plants, meiosis can be observed in 

  1. Root tip

  2. Leaf primordia

  3. Sporangia

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

In plants, meiosis can be observed in sporangia. A microsporangium is the part of plant is suitable for the study of meiosis. A typical anther contains four microsporangia. The microsporangia form sacs or locules in the anther. The two separate locules on each side of an anther may fuse into a single locule. Each microsporangium is lined with a nutritive tissue layer called the tapetum and initially contains diploid pollen mother cells. These undergo meiosis to form haploid spores. The spores may remain attached to each other in a tetrad or separate after meiosis.

Multiple choice botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

Which of the following is the site of meiosis in higher plants?

  1. Growth cells

  2. Root tip cell

  3. Stomatal cell

  4. Spore mother cell
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The site of meiosis in higher plants is the spore mother cell.  In land plants and some algae, there is an alternation of generations such that meiosis in the diploid sporophyte generation produces haploid spores. These spores multiply by mitosis, developing into the haploid gametophyte generation, which then gives rise to gametes directly. In both animals and plants, the final stage is for the gametes to fuse, restoring the original number of chromosomes.

Multiple choice botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

In which of the following meiosis takes place?

  1. Pollen grains

  2. Pollen tube

  3. Pollen mother cells

  4. Generative cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Meiosis occurs in microspores mother cells which are diploid cells; to produce microspores or pollen grains. Each microspore mother cell produces four microspores after a meiotic division.

Multiple choice botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

Which part of plant is suitable for the study of meiosis?

  1. Root apex

  2. Ovary

  3. Anther

  4. Shoot apex
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Anther is the part of plant is suitable for the study of meiosis. A typical anther contains four microsporangia. The microsporangia form sacs or locules in the anther. The two separate locules on each side of an anther may fuse into a single locule. Each microsporangium is lined with a nutritive tissue layer called as the tapetum and initially contains diploid pollen mother cells. These undergo meiosis to form haploid spores. The spores may remain attached to each other in a tetrad or separate after meiosis.

Multiple choice botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

Sporic meiosis occurs in

  1. Animals

  2. Thallophyta

  3. Bryophyta

  4. All plants except thallophyta
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sporic meiosis, has mitosis in two stages, both the diploid and haploid stages, termed diplobiontic. 

Sporic meiosis occurs in all plants except thallophyta. In sporic meiosis, the division by mitosis happens to create a multicellular diploid organism, the sporophyte. Some of the cells of the sporophite then produce spores through a sporic meiosis. In this case, the meiosis is sporic (because it produces spores). The spores then produce a haploid gametophyte which, in turn, will produce the gametes through mitosis. 

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Choose the correct answers from the alternatives given :
In certain organisms and under certain conditions, which of the following can be used as an energy alternative to glucose

  1. fatty acids

  2. glycerol

  3. amino acids

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • in certain conditions such as starvation when sufficient amount of glucose is not present in the blood the foremost priority of the body is to provide brain with the sufficient amount of glucose.
  • So for the other body parts the energy that is to be provided can be done by the use of other substrates instead of glucose.
  • First alternative of glucose is fatty acid which is stored in the body. These fatty acid molecules are converted to acetyl coA by the process of beta oxidation and used in the kerbs cycle to provide the cell with energy.
  • Glycerol is also a fatty acid which is used as the other fatty acid in the kerbs cycle.
  • Amino acids are the part of protein molecules which are usually not stored in the body but can be used in the kerbs cycle whenever they are provided to the cell.
  • Therefore the answer 'all of these' is correct.
Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

What could be the reason for maida flour to increase in size?

  1. Fermentation

  2. Preservation

  3. Fumigation

  4. Both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fermentation is an anaerobic process by which glucose is broken down into alcohol, carbon dioxide, hydrogen gas. Yeast is used during baking process. This process is responsible for the increasing the size of maida dough because yeast converts sugar into carbon dioxide and ethanol. Carbon dioxide gas is trapped by gluten proteins which causes dough to rise.

Thus, the correct answer is 'Fermentation.'

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Buchner was successful in extracting a respiratory enzyme complex

  1. ATP

  2. NADH

  3. Zymase

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

Eduard Buchner was a German chemist who won the Noble prize in chemistry for his chance discovery in 1907. His brother Hans Buchner was a physician who conducted early research on blood proteins that could destroy bacteria. Eduard Buchner assisted his brother in his research. He produced yeast cell-free extracts for his brother who wanted to use them for immunological applications. In order to preserve the protein extract from yeast cells, he added sugar and while doing this he noticed the formation of bubbles. This meant that carbon dioxide and alcohol were being produced. Buchner had obtained an enzyme mixture called zymase from yeast that caused glycolysis and transformed the sugar into alcohol. Thus he discovered zymase, a complex of the enzyme that caused glycolysis in 1903. 

Thus, the correct answer is option C. 

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production
Dough kept overnight in warm weather becomes soft and spongy due to
  1. Absorption of ${CO} _{2}$ from atmosphere

  2. Imbibition

  3. Fermentation

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Fermentation can be described as an enzyme-catalyzed process in which one substrate is usually broken down by the enzymes produced by bacteria, yeast, and other microorganisms. Fermentation of glucose results in the formation of ethanol and carbon monoxide. This is an exothermic reaction and results in the release of energy. The changes observed in dough after keeping it overnight in warm weather is an example of fermentation.
Thus, the correct answer is 'fermentation.'
Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Which of the following is incorrect about fermentation?

  1. Toddy is made by fermenting sap from palms.

  2. Propionibacterium is used to ferment the cheese.
  3. The puffed-up appearance of dough is due to the production of ${ CO } _{ 2 }$.

  4. Fermentation in muscles produces alcohol.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Toddy is created by fermenting the saps of various species of palm trees such as the palmyra, date palms, and coconut palms.
B. Swiss cheese is obtained by propionic fermentation which occurs due to the propionibacteria.

C.  The yeast added to flour reproduces rapidly and produces carbon dioxide gas which gives a puffed-up appearance.
D. Fermentation in muscle cells produces a waste product called lactic acid which contributes to the fatigue in muscles.

So, the correct answer is 'Fermentation in muscles produces alcohol'.