Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Which of the following statements is not correct?

  1. In corn, the mature seed is exalbuminous

  2. In orchids, the embryo has no cotyledons

  3. In corn, the embryo contains young leaves while in the seed

  4. In peach, the fruit is drupe
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Corn (maize) is an endospermic (albuminous) seed, not exalbuminous. Therefore, statement A is the incorrect one.

Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

Endosperm is absent in

  1. Podostemonaceae

  2. Orchidaceae

  3. Trapaceae

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
During double fertilization, the fusion of one sperm with the egg cell forms the embryo and that of the other sperm with a polar nucleus gives rise to the endosperm. The families that lack an endosperm include Orchidaceae, Podostemaceae, and Trapaceae.

So, the correct answer is 'All the above'.
Multiple choice botany pollination, fertilization and development of endosperm and embryo fruits and seeds fruit and its type fertilization events

The fleshy edible part of an apple is

  1. thalamus

  2. nucellus

  3. ovary

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

If a fruit is formed from any other part of the flower  than the ovary, then such a fruit is termed as false fruit. In apple the thallamus of the flower forms the edible part or the fruit.

So, the correct option is 'Option A'.

Multiple choice botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

Ascent of sap is best explained by.

  1. Mass (bulk) flow

  2. Pulsation theory

  3. Root pressure

  4. Cohesion-tension transpiration pull
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The cohesion-tension theory is a theory of intermolecular attraction that explains the process of water flow upwards (against the force of gravity) through the xylem of plants. Transpiration pull, utilizing capillary action and the inherent surface tension of water, is the primary mechanism of water movement in plants.
Answer is D.

Multiple choice botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

the major driving force in the movement of water in the xylem is 

  1. Osmotic pressure

  2. gravitational pull

  3. transpiration pull

  4. Diffussion pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The movement of water in the xylem is explained by the cohesion-tension theory. According to this theory, the water moves up in the xylem via the force of transpiration which is created because of the evaporation of water from the leaves of the plant.

So, the correct answer is 'transpiration pull'.
Multiple choice botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

Read the following statements regarding transaction and select the correct option
I. Transpiration is the loss liquid droplets from the plant
II. Low atmospheric pressure inhibits transpiration
III. Transpiration maintains the shape and structure of plant parts
IV. Cuticular transpiration takes place only during day time

  1. I &II only

  2. I, II &III only

  3. III only

  4. None of the statements are true
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The process of loss of water from the aerial part of the plant in the form of vapor is known as transpiration.
  • It is of three types:-
(i) Cuticle transpiration (loss of water from cuticles),
(ii)Lenticular transpiration (loss of water from lenticels)
(iii)Stomatal transpiration (loss of water from stomata)
  •  Atmospheric pressure, humidity, and temperature are some factor that affects transpiration.
So, the correct option is 'None of the statements are true'.
Multiple choice botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

Which of the following sequence is completely cryptoanalysed?

  1. AUG UCG GAG UAA UUU UGA

  2. AUG UUG UGG GAG UCA UAG

  3. GUG UCG UGA AAG UAU UGA

  4. AUG AAU GCU GUT UAC UAA
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The sequence that can be cryptoanalyzed/ all the codons code for proteins will be devoid of any stop codons. 

Since all the other sequences except AUG AAU GCU GUT UAC UAA can code for proteins without intermediate termination, it can be completely cryptoanalyzed.
So, the correct option is 'AUG AAU GCU GUT UAC UAA'.

Multiple choice botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

Read the following statements and identify the incorrect difference between transpiration pull and root pressure.

Transpiration pull Root pressure
$(1)$ Acts as main driving force for translocation of water in tall trees It establishes chain of water molecules in xylem of tall trees
$(2)$ Its magnitude is maximum during day time Its magnitude is maximum during early morning and night
$(3)$ It generates a strong positive water potential in xylem It is a negative hydrostatic pressure developed in xylem
$(4)$ It is manifestation of passive water absorption It generates from active water absorption
  1. $1$
  2. $2$
  3. $3$
  4. $4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 1 is incorrect because transpiration pull is the driving force for water movement, while root pressure is a minor contributor. The description in the table for statement 1 is swapped or incorrectly attributed.

Multiple choice botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

A pressure that is responsible for pushing up water to small height in the stem is?

  1. Positive root pressure

  2. Turgor pressure

  3. Pressure gradient

  4. Negative root pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Root pressure is a positive pressure that develops in the xylem of roots and can push water up to small heights in the stem.