Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

The process of removing stamens of a flower during the hybridization process is called as________________

  1. Hybridization

  2. Emasculation

  3. Sterilisation

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

  • Emasculation is the removal of stamens or anthers or killing the pollen of a flower without the female reproductive organ is known as emasculation. In bisexual flowers, emasculation is essential to prevent self-pollination. In monoecious plants, male flowers are removed or male inflorescence is removed. 
  • In species with large flowers e.g., (cotton, pulses) hand emasculation is accurate and it is adequate. In species with large flowers, removal of anthers is possible with the help of forceps. It is done before anther dehiscence. 
  • The corolla of the selected flower is opened with the help of forceps and the anthers are carefully removed with the help of forceps. 
  • An efficient emasculation technique should prevent self-pollination and produce a high percentage of seed set on cross-pollination.
Therefore, the correct answer is option B.

Multiple choice botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

By cross pollinating certain tobacco species, some fertile hybrids were obtained by

  1. Mendel

  2. Morgan

  3. Kolreuter

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

In tobacco, due to the continuous self-pollination, homozygosity increases. It results in the occurrence of inbreeding depression, and the plants are called Inbred lines. When these inbred lines are subjected to hybridization, fertile hybrids are obtained. This is called Hybrid vigour or heterosis. This was developed by Kolreuter.

So, the correct option is ‘Kolreuter’.

Multiple choice botany pollination, fertilization and development of endosperm and embryo types of pollination cross pollination pollination and its types

Cross pollination produces

  1. Similar offspring

  2. Weaker progeny

  3. Better progeny

  4. Male progeny
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Cross pollination is the transfer of pollen grains from the anther of one flower to the stigma of another flower borne on a separate plant. Cross pollination results in mixing or combination of characters, and thus improve the vigour and quality of species.
Cross pollination results in better progeny because:
1. Two genetically different pants are involved.
2. There is recombination in cross pollination which increase the vigour.
3. Fertility is increased.
So, the correct answer is C.
Multiple choice botany transpiration guttation excretion in plants long distance transport of water

The process of the escape of liquid from the tip of uninjured leaf is called as

  1. Evaporation

  2. Transpiration

  3. Guttation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Guttation is loss of water in liquid form as a dilute solution from uninjured leaf tips. The uninjured leaf tips have hydathodes or water stomata. Under conditions of low transpiration dilute solution of minerals oozes out through them under the influence of increased root pressure.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

The presence of fluid on the edges of leaves in early morning is due to

  1. Transpiration

  2. Guttation

  3. Exudation of water

  4. Condensation of moisture
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Guttation is the excretion of drops of xylem sap on the tips or edges of leaves of some vascular plants through hydathode, such as grasses. It occurs in the absence of light i.e., at night and thus it is present on the edge of leaves in the early morning.

So, the correct answer is option B.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

Which of the following is not a controlled process?

  1. Transpiration

  2. Guttation

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transpiration is the loss of water through stomata in vapour form. Transpiration is regulated through guard cells. Guttation is the loss of water in liquid form through hydathodes. Hydathodes are free ends of vascular supply of leaves. Hydathodes are always open and not regulated by any cells.

Multiple choice botany transpiration guttation excretion in plants long distance transport of water

The process of water exudation through the hydathode is called as

  1. Guttation

  2. Transpiration

  3. Excretion

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

Guttation is the loss of water in  the form of liquid through hydathodes or water stomata. It occurs due to positive root pressure and serves to remove excess water from the plant. As xylem sap is having dissolved minerals, water droplets that ooze out from them contain solution of water and minerals. 

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

Plants adapted to grow in shade are

  1. Psammophytes

  2. Sciophytes

  3. Mesophytes

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

Plants growing in bright light are called as sun plants or heliophytes, while plants growing in partial shade or low light intensity are called as shade plants or sciophytes. 

In sciophytes the stems are soft, slender with large internodes. Leaves are thin and large sized. The have bright green colour. Leaf cells are large. Cuticle is thin. Stomata are in level with surface. Palisade parenchyma is less developed. There is more vegetative growth as compared to flowering and fruiting
So, the correct answer is 'Sciophytes'

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

A succulent xerophyte is

  1. Capparis

  2. Calotropis

  3. Agave

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In succulent xerophyte, plants have fleshy organs, where water and mucilage are stored. Depending upon the organ, where succulence occurs, the succulents show chylocauly, i.e., fleshy stem, e.g., Opuntia, Euphorbia, Asparagus; chylophylly ie fleshy leaves, e.g., Agave, Aloe or chylorhizy, i.e., fleshy roots, e.g., Asparagus.

Multiple choice botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

Mechanical tissue is best developed in

  1. Hydrophytes

  2. Halophytes

  3. Xerophytes

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

Plants living in dry conditions are called as xerophytes. These plants show many morphological and structural adaptations to survive in dry conditions. In stem the mechanical tissue is well developed and also bark is well developed to retain water

The mechanical tissue is least developed in hydrophytes to avoid resistance to water current
So, the correct answer is 'Xerophytes'