Tag: botany

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Questions Related to botany

Multiple choice botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

Polyarch and exarch condition is found in

  1. Monocot stem

  2. Monocot root

  3. Dicot stem

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

Monocot root vascular bundles are radial in the arrangement. There are eight types of bundles each of xylem and phloem. Thus the condition is described as the polyarch. Xylem is detailed as an exarch.

Monocot stem vascular bundles are many in number and the xylem is the endarch.

Dicot stem vascular bundles are also eight in number but arranged in the form of a broken ring. The vascular bundles are conjoint, collateral and open. Xylem is on the inner surface and phloem on the outer surface. Xylem is described as an endarch.

Dicot root vascular bundles are described as radial and tetrarch. There are four bundles each of xylem and phloem occurring alternately. Xylem is described as an exarch.

So, the correct answer is 'Monocot root'

So, the correct answer is B.

Multiple choice botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

In roots, lateral branches grow from.

  1. Epiblema

  2. Pericycle

  3. Cortex

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

A. Epiblema – root epidermis with root hairs is called epiblema

B. Pericycle – outer most part of the stele in roots and dicot stem, produces lateral branches

C. Cortex – middle of root and dicot stem internally

D. Endodermis – inner most part of the cortex

So, the correct option is ‘Pericycle'

Multiple choice botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

Passage cells occur in

  1. Monocot root

  2. Dicot root

  3. Monocot stem

  4. Aerial root
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Endodermal cells without casparian strips or bands are called passage cells. These are present opposite to the protoxylem cells. These are found in both dicot root and monocot root.

So, the correct option is 'Monocot root & dicot root'.

Multiple choice botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

As compared to a dicot root, a monocot root has

  1. More abundant secondary xylem

  2. Many xylem bundles

  3. Inconspicuous annual rings

  4. Relatively thicker periderm
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The anatomy of dicot root differs from monocot root, in activity of pericycle, no. of xylem strands, presence of medulla, activity of conjunctive tissue.  

In dicot root, pericycle is involved in the formation of lateral roots and vascular cambiu, where as in monocot root, pericycle is involved in the formation of lateral roots. 
In dicot root 2 to 4 xylem strands are present in the stele, where as monocot root more than 4 xylem strands are present.
In dicot root, medulla is reduced, where as in monocot root medulla is well developed.
In dicot root, conjunctive tissue involved in the formation of vascular cambium, where as in monocot root, it is not involved in the formation of vascular cambium.
So, the correct option is 'Many xylem bundles'.

Multiple choice botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

Out of the following, how many features belong to monocot root? 
1. Radial vascular bundles 
2. Closed vascular bundles
3. Endodermis absent
4. Pith developed
5. Polyarch condition

  1. One

  2. Two

  3. Three

  4. Four
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
When xylem and phloem within a vascular bundle are arranged in an alternate manner on different radii, then it is called Radial vascular bundles. It is true for monocot roots.
When there is no cambium present between the xylem and phloem elements, the bindle is said to be Closed vascular bundles.It is true for monocot roots.
Endodermis is very distinct in monocot root.Hence, sentence number 3 does not belong to the features of monocot root.
Pith is large and well developed in roots of monocotyledonous plants.
Monocot root comprises of more than six xylem bundles i.e. Polyarch condition.
So, the correct option is 'Four'
Multiple choice botany internal structure of root, stem and leaf internal structure of monocot root internal structure of root(dicot and monocot) anatomy of root

Which of the following is seen in a monocot root?

  1. Large pith

  2. Vascular cambium

  3. Endarch xylem

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

In monocot root, the vascular bundles are usually more than six in number. Pith is large and parenchymatous. The parenchyma of the pith become lignified and sclerenchymatous.

Multiple choice botany classification of living beings hierarchy of classification different types of classifications introduction to classification of living organisms

Choose the correct answers from the alternatives given.
All of the following are true regarding systematics except that:

  1. it is the study of the diversity of organisms at all levels of organisation

  2. it is the specific study of identification, naming, and classification of organisms

  3. it relies on data from the fossil record, homology, and molecular data

  4. it utilises protein, DNA and RNA comparisons to determine relatedness of individuals
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Systematics is the study of the diversification of living forms and their relationships through time, which includes taxonomy but is broader. Taxonomy is the specific study of identification, naming, and classification.

Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

Lenticels are associated with

  1. Absorption of moisture

  2. Photosynthesis

  3. Gaseous Exchange

  4. Mineral uptakes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Lenticels act as a pore and provide a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases.
So, the correct option is 'Gaseous Exchange'.
Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

The waste product of photosynthesis is 

  1. Carbon dioxide

  2. Oxygen

  3. Nitrogen

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

Photosynthesis is the process by which green plants make their own food from carbon dioxide and water in the presence of sunlight. The prepared food is glucose. To prepare one molecule of glucose, by the process of photosynthesis six molecules of carbon dioxide and six molecules of water is required. Six oxygen molecule is released as a waste product. This oxygen is produced due to splitting of water by the process of photolysis during light reaction. So, the correct answer is option 'Oxygen'.

Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

In respiration,

  1. Chlorophyll synthesises food from carbon dioxide and water in the presence of sunlight.

  2. Oxygen absorbed from air or water is made to combine with carbon dioxide to produce food.

  3. Chlorophyll absorbs oxygen from air or water and releases carbon dioxide.

  4. Oxygen is absorbed from air or water and made to combine with food and carbon dioxide is released.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In physiology, respiration is defined as the movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. The physiological definition of respiration should not be confused with the biochemical definition of respiration, which refers to cellular respiration. The metabolic process by which an organism obtains energy by reacting oxygen with glucose to give water, carbon dioxide and 38 ATP (energy). Although, physiologic respiration is necessary to sustain cellular respiration and thus life in animals, the processes are distinct: cellular respiration takes place in individual cells of the organism, while physiologic respiration concerns the bulk flow and transport of metabolites between the organism and the external environment. 

Therefore, the correct answer is option D.