Tag: botany

Questions Related to botany

Nodulation of legumes is reduced in deficiency of.

botany root - external morphology root system in plants modifications of root root modifications

  1. Sulphur and potassium

  2. Sulphur and boron

  3. Manganese and copper

  4. Zinc

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Correct Option: A

Read the following four statements:
(A) A simple experiment called girdling was used to identify the tissue through which food is translocated.
(B) Plant factors that effect transpiration include temperature, light, wind velocity and humidity.
(C) Most of the water flow in root occur via apoplast.
(D) In young root, water directly enters into the xylem vessels.
How many of the above statements are right?

botany root - external morphology root system in plants modifications of root root modifications

  1. Four

  2. Three

  3. Two

  4. One

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Correct Option: A

Mycorrhizal association controls root affecting pathogens in plants because.

botany root - external morphology root system in plants modifications of root root modifications

  1. Mychorrhizal fungi colonize the roots and acts as a barrier during infection

  2. Mychorrhizal fungi helps in phosphorus uptake

  3. Mychorrhizal fungi help during stress and shock

  4. Mychorrhizal fungi produce toxins against pathogens

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Correct Option: A

Select the incorrect match with respect to the plant and the relative plant part modified for food storage.

botany root - external morphology root system in plants modifications of root root modifications

  1. Lathyrus odoratus (sweet potato) - Root

  2. Solanum tuberosum (potato) - Stem

  3. Allium cepa (onion) - Leaves

  4. Dahlia (Dahlia) - Leaves

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Correct Option: D
Explanation:

The incorrect match is: 

Dahlia(Dahlia) - Leaves
So, the correct answer is (d).

Plants living perched on other plants but not obtaining water or food from them are called

botany root - external morphology root system in plants modifications of root root modifications

  1. Hydrophytes

  2. Periphytes

  3. Epiphytes

  4. Epinastic plants

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Correct Option: C
Explanation:
These stems will supply water to the plants when there is not enough rain water.  Some epiphytes, like certain orchids, have roots that can absorb water vapour from the air! For their nutrients (something like vitamins), these epiphytes get them from rotting leaves, twigs and small branches that are found nearby. So, the correct answer is "Epiphytes."

Choose the correct answers from the alternatives given.
Unlike primary growth, secondary growth in both roots and stems

botany root - external morphology root system in plants modifications of root root modifications

  1. Is indeterminate

  2. Produces xylem and phloem

  3. Involves vascular and cork cambiums

  4. Result in a rapid increase in root or stem length

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Correct Option: C
Explanation:

Secondary growth is the increase in the girth of stem and roots of plant. It occurs by cell divisions in two lateral meristems that are vascular cambium and cork cambium.

Vascular cambium is a thin layer of cells between xylem and phloem which increases girth by cell divisions
Cork cambium is a layer of meristematic cells that give rise to cork outside and secondary cortical cells inside.
While plant growth is indeterminate due to both primary and secondary growth. Also, both primary and secondary produce xylem and phloem. 
So the correct answer is it "Involves vascular and cork cambiums''

Velamen is found in

botany root - external morphology root system in plants modifications of root root modifications

  1. Vanda

  2. Rosa

  3. Viscum

  4. Sanctalum

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Correct Option: A
Explanation:

Velamen is the thick layer of dead cells that covers the aerial roots of certain orchids and aroids and absorbs moisture from the surroundings. Vanda is an example of a genus having velamen in their roots from orchid family.

So, the correct option is 'Vanda'.

Which of the following scientists concluded by his experiments that green plant play a role in  purifying the noxious air only in the presence of sunlight?
botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

  1. Priestley

  2. Ingenhousz

  3. Sachs

  4. Engelmann

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Correct Option: B
Explanation:

Jan Ingenhousz (1730-1799), in his experiment with an aquatic plant, showed that in bright sunlight, small bubbles were formed around the green parts while in the dark, no such bubbles formed. He found out these bubbles to be of oxygen. He thus, confirmed that purification of air or formation of dephlogiston is carried out by green plants only in presence of sunlight. 

The process in which liquid water changes into gas is called

botany plant nutrition experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

  1. Precipitation

  2. Condensation

  3. Evaporation

  4. Transpiration

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Correct Option: C
Explanation:

Sun derives the water cycle, heats up water in ocean and seas, and then water vapours evaporate to air. As the vapours move upward the cool temperature there causes it to condense into clouds and they fall as precipitate like rain, hailstone etc.

During photosynthesis, oxygen in glucose comes from

botany plant nutrition experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases

  1. oxygen in air

  2. water

  3. carbon dioxide

  4. both (B) and (C).

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Correct Option: B