Tag: biology

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Questions Related to biology

Multiple choice biology coordination - the linking system nervous systems involved in emotions types of nervous system components of nervous system

The electrical potential difference between outside and inside of a nerve axon before excitation is known as ____________.

  1. Resting potential

  2. Action potential

  3. Spike potential

  4. Reaction potential
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The electrical potential difference between outside and inside of a nerve fibre before excitation (polarized nerve fibre) is known as resting potential whose value is $-70$ mV.

Multiple choice biology coordination - the linking system nervous systems involved in emotions types of nervous system components of nervous system

The simplest type of nervous system in the form of network of neurons is present in which of these lower organisms?

  1. sycon

  2. hydra

  3. earthworm

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

The second type of water-current system found also in calcareous sponges, is at first characterized by choanocytes that surround fingerlike projections of the sponge wall. So the correct option is ' sycon'.

Multiple choice biology coordination - the linking system nervous systems involved in emotions types of nervous system components of nervous system

The simplest form of nervous system found in cnidarians is called as

  1. Nerve-trunk system

  2. Ladder system

  3. Nerve-net system

  4. Nerve-cord system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nerve net found in many cnidarians is a part of more advanced nervous systems. Cytoplasmic processes join the nerve cells (neurons) of nerve nets. In cnidarians, the neurons are joined to epithelial receptors and to contractile cells. In vertebrates, nerve nets may be found around blood vessels and the alimentary tract. The nerve net is the simplest form of a nervous system found in multicellular organisms. Unlike, central nervous systems where neurons are typically grouped together, neurons found in nerve nets are found spread apart. This nervous system allows cnidarians to respond to physical contact. They can detect food and other chemicals in a rudimentary way. While the nerve net allows the organism to respond to its environment, it does not serve as a means by which the organism can detect the source of the stimulus. For this reason, simple animals with nerve nets, such as Hydra, will typically produce the same motor output in response to contact with a stimulus regardless of the point of contact. 

Therefore, the correct answer is option C.

Multiple choice biology breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

Choose the correct answers from the alternatives given .
Which of the following is not one of the four most common elements found in living organisms?

  1. Hydrogen

  2. Carbon

  3. Sulphur

  4. Nitrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The cells of living things are made mainly of four elements: carbon, hydrogen, oxygen and nitrogen. Phosphorus and calcium are next in abundance after these 4 elements. Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus.
So, the correct option is 'Sulphur'.
Multiple choice biology breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

System of vessels and tubes in animals is called as

  1. Digestive system

  2. Circulatory system

  3. Respiratory system

  4. Reproductive system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Human circulatory system, also called the blood vascular system consists of a muscular chambered heart, a network of closed branching blood vessels and blood, the fluid which is circulated. It is essentially a network of tubes that supplies to all living cells essential nutrients, O$ _2$ and other essential substances. Also, the waste or harmful substances produced are removed continuously for the healthy functioning of tissues.

Multiple choice biology breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

Mark the incorrect statement

  1. Every organ in our body needs the involvement of circulating fluids.

  2. The digestive system absorb & digest nutrients.

  3. The respiratory system removes all extra water of the body.

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

Every organ in our body needs the involvement of circulating fluid. Ex - The digestive system digests & absorb nutrients which are needed to be transported to every cell in the body.

Multiple choice biology breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

Only the multi cellular organisms require transporting mechanisms.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Unicellular organisms also require transporting mechanism in order to transport nutrients, enzymes, waste products etc. The transport mechanism in unicellular organisms is simpler than multicellular organisms. Unicellular organisms can transport substances in and out of the body by diffusion and osmosis.

Multiple choice biology breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

A transport system is needed to transport
(i) Nutrients, oxygen and hormones from the place, they are absorbed or received to the cells.
(ii) Waste products from the place they are formed to the place from where they are eliminated outside.
(iii) Heart beat, chromosome.

  1. (i) and (ii) correct

  2. (i) and (iii) correct

  3. (ii) and (iii) correct

  4. (i) , (ii) and (iii) correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The human transport system is a system of tubes with a pump and valves to ensure one-way blood flow. We need a transport system to deliver oxygen, nutrients, hormones and other substances to all our body cells and take away waste products from them. 

Multiple choice biology breath and blood of life different types of circulatory systems stomata and transpiration transport in organisms

Heart of cockroach is a

  1. Membranus

  2. Muscular and tube like

  3. Absent

  4. Filled with blood having RBC
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A) The heart is not membranous.

B) The heart is an elongated muscular tube lying along the mid-dorsal line of the thorax and abdomen.
C) A muscular heart with thirteen chambers is present.

D) The blood of cockroaches consists of clear colourless plasma and cells called haemocytes. RBCs are absent. The blood is devoid of any pigments.
So the correct answer is 'Muscular and tube like'.