Tag: botany

Questions Related to botany

A is a closed vessel that contains an ovary in which eggs develop, fertilization occurs, and seeds mature

botany flower androecium and gynoecium flower: accessory parts and reproductive parts reproductive morphology

  1. Pollen sac

  2. Receptacle

  3. Microsporophyll

  4. Carpel

Show answer
Correct Option: D
Explanation:

Carpel is the female reproductive organ of a flower, consisting of an ovary, a stigma, and usually a style. A carpel is the female reproductive part of the flower, interpreted as modified leaves bearing structures called ovules, inside which the egg cells ultimately form. It may occur singly or as one of a group. Fertilization of an egg within a carpel by a pollen grain from another flower results in seed development within the carpel

So, the correct answer is 'carpel'

Part of the gynoecium which receives the pollen is called.

botany flower androecium and gynoecium flower: accessory parts and reproductive parts reproductive morphology

  1. Style

  2. Stigma

  3. Ovule

  4. Ovary

Show answer
Correct Option: B
Explanation:

Transfer of pollen grains to the stigma of a pistil is called pollination. Stigma is large and feathery so that it can trap air-borne pollen grains. 

So, the correct option is 'Stigma'.

The statements given described certain features that are observed in the pistil of flowers.
I. Pistil may produce more than one seed
II. Each carpel may have more than one ovule
III. Each carpel has only one ovule
IV. Pistil have only one carpel
Choose the statements that are true from the options given.

botany flower androecium and gynoecium flower: accessory parts and reproductive parts reproductive morphology

  1. i and ii

  2. i and iii

  3. ii and iv

  4. iii and iv

Show answer
Correct Option: A
Explanation:

The pistils of flowers are composed of carpels which contain many ovules that have seeds inside of them. Hence, a single pistil is capable of producing more than one ovule. 

So, the correct answer  is 'i and ii'.

In a plant cell chlorophyll is present in:

botany photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments

  1. Caraplasts

  2. Stroma

  3. Leucoplast

  4. Chloroplast

Show answer
Correct Option: D
Explanation:

the green coloured, chief photosynthetic pigment present in the chloroplasts of higher plants is called chlorophyll. It is found in algae, and higher plants.

So, the correct option is 'Chloroplasts'.

Minerals controlling synthesis of chlorophyll molecule ______________.

botany photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments

  1. $Ca$ and $K$

  2. $Fe$ and $Mg$

  3. $Mn$ and $K$

  4. $Ca$ and $Mg$

Show answer
Correct Option: A

Ginger-Muller counter is used for ________________.

botany photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments

  1. Estimating chlorophyll concentration

  2. Measuring radioactivity

  3. Identifying phytochrome pigments

  4. Measuring the light absorption by chlorophyll

Show answer
Correct Option: A

Which of the following is not a type of potometer ?

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Ganong's

  2. Darwin's

  3. Newton's

  4. None of these

Show answer
Correct Option: C
Explanation:

Types of Potometer are:-

  • Bubble potometer
  • Mass potometer
  • Ganong's potometer
  • Darwin's potometer

Approx. _______ of the water absorbed by a plant is lost in transpiration.

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. 20-40%

  2. 98-99%

  3. 1-2%

  4. 6-8%

Show answer
Correct Option: B
Explanation:

Approx. 98-99% of the water absorbed by a plant is lost in transpiration. Hardly 0.2% is used in photosynthesis while the remaining is retained in the plant during growth.

Significance of transpiration lies in

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Circulation of water

  2. Absorption and distribution of water

  3. Regulating the temperature of the plant body

  4. All of the above

Show answer
Correct Option: D
Explanation:

Transpiration generates tension in plants. This tension is the main pulling force which pulls water to great heights in vascular plants. Thus, transpiration leads to the ascent of sap. Without transpiration water and minerals will not rise from roots to aerial parts of plants and trees. Transpiration also causes surface cooling of leaves and hence regulates the temperature of the plant body. At the same time, it is essentially a wasteful process. As much as 99 percent of water absorbed by a plant goes waste into the atmosphere. Thus, transpiration has been called as a necessary evil.

Exchange of gases occur through 

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Stomata

  2. Lenticels

  3. Root surface

  4. All of the above

Show answer
Correct Option: D
Explanation:

In plants, gas exchange occurs through small pores in the leaf surface called stomata. Stomata can open to allow the exchange of gasses and close to reduce water loss from the plant. In the covering of the secondary structure of the stem of woody plants gas exchange is made through the lenticels of the periderm (small breaches of the cork). The cork of mature roots is also perforated by non-suberized pores called lenticels. These enable oxygen to reach the intercellular spaces of the interior tissues and carbon dioxide to be released into the atmosphere.