Tag: botany

Questions Related to botany

Which of the following statements is not correct?

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

  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

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Correct Option: A

Which of the following is false fruit?

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

  1. Groundnut

  2. Mustard, Mango

  3. Citrus

  4. Apple, strawberry

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Correct Option: D

Endosperm is absent in

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

  1. Podostemonaceae

  2. Orchidaceae

  3. Trapaceae

  4. All the above

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Correct Option: D
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'.

The fleshy edible part of an apple is

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

  1. thalamus

  2. nucellus

  3. ovary

  4. endosperm

Show answer
Correct Option: A
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'.

Ascent of sap is best explained by.

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

  1. Mass (bulk) flow

  2. Pulsation theory

  3. Root pressure

  4. Cohesion-tension transpiration pull

Show answer
Correct Option: D
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.

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

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

  1. Osmotic pressure

  2. gravitational pull

  3. transpiration pull

  4. Diffussion pressure

Show answer
Correct Option: C
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'.

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

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

  1. I &II only

  2. I, II &III only

  3. III only

  4. None of the statements are true

Show answer
Correct Option: D
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'.

Which of the following sequence is completely cryptoanalysed?

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

  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

Show answer
Correct Option: D
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'.

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
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

  1. $1$

  2. $2$

  3. $3$

  4. $4$

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Correct Option: A

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

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

  1. Positive root pressure

  2. Turgor pressure

  3. Pressure gradient

  4. Negative root pressure

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Correct Option: A