Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

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?

  1. Four

  2. Three

  3. Two

  4. One
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Mycorrhizal association controls root affecting pathogens in plants because.

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhizal fungi form a physical mantle or network around the roots, which acts as a physical barrier against soil-borne pathogens, in addition to aiding in nutrient uptake.

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

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

  1. Lathyrus odoratus (sweet potato) - Root

  2. Solanum tuberosum (potato) - Stem

  3. Allium cepa (onion) - Leaves

  4. Dahlia (Dahlia) - Leaves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The incorrect match is: 

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

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

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

  1. Hydrophytes

  2. Periphytes

  3. Epiphytes

  4. Epinastic plants
Reveal answer Fill a bubble to check yourself
C Correct answer
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."
Multiple choice botany root - external morphology root system in plants modifications of root root modifications

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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''

Multiple choice botany how plants grow experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments various experiments on photosynthesis experiments on photosynthesis - gases
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?

  1. Priestley

  2. Ingenhousz

  3. Sachs

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

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

The process in which liquid water changes into gas is called

  1. Precipitation

  2. Condensation

  3. Evaporation

  4. Transpiration
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

During photosynthesis, oxygen in glucose comes from

  1. oxygen in air

  2. water

  3. carbon dioxide

  4. both (B) and (C).
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Isotope labeling experiments (using O-18) have demonstrated that the oxygen released during photosynthesis comes from the splitting of water molecules (photolysis), not from carbon dioxide.