Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology animal tissues, morphology and anatomy of cockroach types of neuron nervous tissue neural tissues

Myelin sheath has layers of fat and protein

  1. Upto 100

  2. 10-20

  3. Two each

  4. One each
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Myelin is an insulating layer or sheath that forms around nerves, including those in the brain and spinal cord.
  •  It is made up of protein and fatty substances. 
  • This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells.
  •  If myelin is damaged, these impulses slow down. Hence, the Myelin sheath has layers of fat and protein up to 100.
So, the correct answer is 'up to 100'.

Multiple choice biology animal tissues, morphology and anatomy of cockroach types of neuron nervous tissue neural tissues

The characteristic of a nerve cell that relates directly to its function is its-

  1. Long extensions.

  2. Flat shape.

  3. Ability to change shape.

  4. Ability to engulf bacteria.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The long extensions of a nerve cell (axons and dendrites) are essential for its function of transmitting signals over long distances within the body.

Multiple choice biology animal tissues, morphology and anatomy of cockroach types of neuron nervous tissue neural tissues

Bipolar neurons are present in the

  1. Retina of eyes

  2. Olfactory epithelium

  3. Spinal ganglia at embryonic stage

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bipolar neurons are specialised neurons that have two cytoplasmic extensions. Out of which one serves as an axon and other serves as a dendrite both having similar branches. They function in sight, hearing, tasting, etc. They are located in the retina of the eyes, the roof of the nasal cavity, inner ear. 

So, the correct answer is option D.

Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

Carbohydrates, the most abundant biomolecules on earth are produced by

  1. Some bacteria, algae and green plants

  2. Fungi, algae and green plants

  3. All bacteria, fungi and algae

  4. Viruses, fungi and bacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbohydrate synthesis occurs through photosynthesis Chloroplasts are the green plastids which occur in all the green parts of the plants. They are the actual site of photosynthesis. 

Cyanobacteria and other photosynthetic bacteria do not possess chloroplasts. However, the photosynthetic pigments of these organisms are located on thylakoids which lie freely in the cytoplasm.
The algae also contain the chloroplasts to perform the photosynthesis.
Fungi are either saprophytic, symbiotic or parasitic organisms. Viruses are parasitic.
Hence, the correct answer is 'Some bacteria, algae and green plants'.

Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

Photosynthesis is essential for survival of

  1. Animals

  2. Plants

  3. Most of the organisms

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Photosynthesis is plants taking in water, carbon dioxide, and light to make sugar and oxygen. This is important because all living things need oxygen to survive. All producers make oxygen and sugar for the secondary consumers and then the carnivores eat animals that eat the plants. If there is not enough producers to make the sugar and oxygen that all living things need then all living things will die out. Without producers CO2 couldn't be taken in by the plants to be turned back into oxygen that all animals need for survival. Also, without producers, herbivores wouldn't have anything to eat and they would all die leaving carnivores without food to eat and all life forms wouldn't be on Earth. Photosynthesis happens in the Chloroplast of the plant's organelle, if the Chloroplast wasn't in the plant Photosynthesis couldn't happen. If there was no sunlight for the plant to absorb then Photosynthesis couldn't happen. If living things didn't breathe out CO2 then the plants would die and living things would have no way of getting oxygen. These are the reasons why Photosynthesis is important to plants and all loving things on the planet.

So, the correct option is 'Option D'.
Multiple choice biology the leaf mechanism of absorption mineral absorption significance of transpiration

Match List I with List II and select the correct answer using the codes given the lists.

List I List II
a. Dictyosomes $1$. Storage
b. Mitochondria $2$. Photosynthesis
c. Vacuoles $3$. Transport
d. Grana $4$. Secretion
$5$. Respiration
  1. A-$4$, B-$5$, C-$1$, D-$2$
  2. A-$3$, B-$4$, C-$2$, D-$1$
  3. A-$4$, B-$5$, C-$3$, D-$2$
  4. A-$4$, B-$3$, C-$1$, D-$3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dictyosomes are involved in secretion (4), Mitochondria are the site of respiration (5), Vacuoles are for storage (1), and Grana are the site of photosynthesis (2). This matches A-4, B-5, C-1, D-2.