Tag: botany

Questions Related to botany

Polyarch and exarch condition is found in

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

  1. Monocot stem

  2. Monocot root

  3. Dicot stem

  4. Dicot root

Show answer
Correct Option: B
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.

In roots, lateral branches grow from.

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

  1. Epiblema

  2. Pericycle

  3. Cortex

  4. Endodermis

Show answer
Correct Option: B
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'

Passage cells occur in

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

  1. Monocot root

  2. Dicot root

  3. Monocot stem

  4. Aerial root

Show answer
Correct Option: A,B
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'.

As compared to a dicot root, a monocot root has

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

  1. More abundant secondary xylem

  2. Many xylem bundles

  3. Inconspicuous annual rings

  4. Relatively thicker periderm

Show answer
Correct Option: B
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'.

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

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

  1. One

  2. Two

  3. Three

  4. Four

Show answer
Correct Option: D
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'

Which of the following is seen in a monocot root?

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

  1. Large pith

  2. Vascular cambium

  3. Endarch xylem

  4. Medullary ray

Show answer
Correct Option: A
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.

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

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

  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

Show answer
Correct Option: B

Lenticels are associated with

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

  1. Absorption of moisture

  2. Photosynthesis

  3. Gaseous Exchange

  4. Mineral uptakes

Show answer
Correct Option: C
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'.

The waste product of photosynthesis is 

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

  1. Carbon dioxide

  2. Oxygen

  3. Nitrogen

  4. None of the above

Show answer
Correct Option: B
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'.

In respiration,

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

  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.

Show answer
Correct Option: D
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.