Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Which of the following cells do not take part in transportation?

  1. RBC

  2. WBC

  3. Platelets

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

Hemoglobin (Hb or Hgb ) is an iron-containing protein present in Erythrocytes or Red blood cells (RBC) of almost all vertebrates. Each hemoglobin is made up of 4 subunits, 2 alpha subunits, and 2 beta subunits. Each subunit surrounds the central heme group that contains iron and binds to one oxygen molecule. It carries oxygen from lungs to tissues. It also helps in the transportation of carbon dioxide, hydrogen ions back to the lungs from the tissues. Hence RBC helps in transportation of gases while WBC takes parts in immune function and protects the body from infectious diseases and foreign invaders(bacteria, viruses other pathogens) and platelets in blood coagulation.

So, the correct answer is 'Both B and C'.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

The major source of minerals in the soil is

  1. Parent rock from which soil is formed

  2. Plants

  3. Animals

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

The absorption, distribution and metabolism of various mineral elements by plants are called mineral nutrition. The mineral elements play important role in the performance and maintenance of life activities. All microelements are absorbed by plants in traces and derived from the parent rock by the process of weathering. 

So, the correct answer is option A.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

Nutrient which are required in small quantities are called as

  1. Macronutrients

  2. Micronutrients

  3. Primary nutrients

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

A nutrient which is required in small quantities is called as a micronutrient. The micronutrients are boron, chlorine, copper, iron, manganese, molybdenum and zinc. These plant food elements are used in very small amounts, but they are just as important to plant development and profitable crop production as the major nutrients. Especially, they work "behind the scene" as activators of many plant functions.

Thus, the correct answer is 'Micronutrients'.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

Ammonium sulphate is a

  1. Pesticide

  2. Weedicide

  3. Fertilizer

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

Ammonium sulfate is a fertilizer as it increases the fertility of soil and plants can use it for their functions.

It cannot kill pests or weeds and hence is not a pesticide or a weedicide.
Tonic chemicals are medicines given to feel vigour. Ammonium sulfate has no such function.
So the correct answer is 'Fertilizer'.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

Active transport of ions by the cell requires

  1. High temperature

  2. ATP

  3. Alkaline pH

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

Whenever active transport is being carried out energy is required and ATP is used up as it is the energy currency of the cell.

High temperature, Alkaline pH or Salts cannot carry out active transport as it involves movement of a substance against it's concentration gradient.
So, the correct answer is 'ATP'

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

Active transport from outside to inside of molecules across a membrane requires

  1. Cyclic AMP

  2. ATP

  3. Phloroglucinol

  4. Acetyle chloine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The active transport of substances require energy and hence they use up ATP which is the energy currency of the cell.

Acetly choline and Cyclic AMP are involved in cell signalled.
Phloroglucinol is a stain used to observe lignin.
So the correct answer is 'ATP'.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

Select the correct statement regarding "A trace element is an element which".

  1. Is a radio active and can be traced by Geiger counter.

  2. Is required in very minute amounts.

  3. Draws other element out of protoplasm.

  4. Was one of the first to be discovered in protoplasm.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trace elements are the ones which are required in. Very less amount and are present in less amounts as compared to other elements of major use.

Usually, they have very specific functions and do not contribute structurally.
Macronutrients were discovered first in the cytoplasm.
Radioactive elements are usually not present in the plant bodies.
So the correct answer is 'Is required in very minute amounts'.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

In the root nodules of legumes, leghaemoglobin is important because it

  1. Transports oxygen to the root nodule.

  2. Acts as an oxygen scavenger.

  3. Provides energy to the nitrogen fixing bacterium.

  4. Acts as a catalyst in transamination.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The root nodule bacterium is microaerobic in the sense that it requires oxygen but the high concentration of oxygen is detrimental to nitrogen-fixing enzyme system. Here leghaemoglobin proves beneficial, it absorbs or binds oxygen so that there is no free oxygen left in the nodule and then carries micro-amounts of oxygen to the nodule bacteroids. Thus the correct answer is option B.

Multiple choice biology transport in plants transport of food, water and minerals theories of translocation transport in the phloem of plants

Brown heart disease is due to the deficiency of

  1. Boron.

  2. Iron.

  3. Molybdenum.

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

Boron regulates pentose phosphate pathway, increases sugar translocation in plants. Due to deficiency of boron growth of roots stops and the disease ' brown heart' is caused in sugarbeet. Thus option A is the correct answer.