Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

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

  1. Pollen sac

  2. Receptacle

  3. Microsporophyll

  4. Carpel
Reveal answer Fill a bubble to check yourself
D Correct answer
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'

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

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.

  1. i and ii

  2. i and iii

  3. ii and iv

  4. iii and iv
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

Multiple choice botany the leaf mechanism of absorption mineral absorption significance of transpiration

Significance of transpiration lies in

  1. Circulation of water

  2. Absorption and distribution of water

  3. Regulating the temperature of the plant body

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

Multiple choice botany the leaf mechanism of absorption mineral absorption significance of transpiration

Exchange of gases occur through 

  1. Stomata

  2. Lenticels

  3. Root surface

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.