Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Choose the desert plant from the following:

  1. Lotus

  2. Banyan tree

  3. Opuntia

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

One of the most commonly found plants in deserts is opuntia. it is a type of cactus. It is also called prickly pear. It is used to treat burns, diabetes, ulcers, inflammation, etc.

So, option c is the correct answer.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Xerophytes have very small leaves or spines to.

  1. Reduce weight

  2. Reduce loss of water

  3. Reduce volume

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

Xerophytes have very small leaves or spines to reduce loss of water.

A xerophyte is a species of plant that has adapted to survive in an environment with little liquid water, such as a desert or an ice- or snow-covered region.

Morphologically and physiologically the xerophytes are adapted to conserve water and also to store large quantities of water in the dry periods. Some species are adapted to survive long periods of dehydration in their tissues. During the periods of dehydration the metabolic activity of them may be shut down.

Morphological Adaptations in xerophytic plants

Almost all the xerophytic plants have similar shapes, structure and forms and they look very similar though these plants are not genetically related. This process of evolution is known as convergent evolution.

Reduction of Surface Area
  • Xerophytic plants usually have less surface area than other plants, this reduces the area that is exposed to the air and helps in reducing water loss by evaporation process.
  • These plants have smaller leaves and few branches than other plants.
Reduction in Air Flow
  • Some xerophytes plants have tiny hairs on their surface; this provides a wind break and reduces air flow, which reduces the rate of evaporation.
  • In such environments the region under the leaves/spines is the place of transpiration and this place is more saturated than the normal water vapor.
  • If there is less movement of air, there is reduced potential gradient of the water vapor hence reducing transpiration.
  • Spines trap moisture and also slow the movement of air over the tissues.
Reflectivity
  • The color of these plants or of the waxes or hairs on its surface may help to reflect sunlight and reduce evaporation.
  • Physiological Adaptations of Xeropyhtes
  • Some xerophytic plants store water in structures like roots, trunks, stems and leaves. Water is stored in swollen parts of the plant known as succulence. A swollen trunk part or the root part at the ground level of a plant is called caudex.
  • Stomata are tiny pores on the surface of xerophytic plants; they stay open only at night to reduce evaporation.
  • These plants may secrete resins and waxes on their surface which reduce evaporation.
  • Some plants drop their leaves in the times of dryness or they modify the leaves produced so that they are smaller and less surface area of the plants is exposed.
  • Xerophytic plants may go dormant and stop growing during dry periods; they may also change the kind of photosynthesis or they may change the storage allotment of the products of photosynthesis by growing new leaves to the roots.
  • Seeds also may be modified to require excessive amount of water before the process of germination, so to ensure that there is sufficient supply of water for the survival of the seedling.
  • So, the correct answer is 'Reduce loss of water'
Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

In xerophytes, the osmotic concentration of cell sap is

  1. Less than normal

  2. Normal

  3. More than normal

  4. No osmotic pressure at all
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The osmotic concentration of cell sap is higher in xerophytes to allow them to absorb water in an otherwise water deficient environment. The higher osmotic concentration would mean a lower water potential. A lower water potential will be advantageous to xerophytes as water always flows from a higher water potential to lower water potential.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Plants give out water through the pores present under their leaves. The plants living in deserts need to reduce the loss of water because water is very scarce in deserts. Which of the following is an adaptation developed by the desert plants to manage the above situation?

  1. They have lots of branches and leaves.

  2. They do not shed leaves in the summer.

  3. They develop roots which come above the ground.

  4. Their leaves are modified into spines.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Most species of desert plants have lost true leaves, retaining only spines, which are highly modified leaves. As well as defending against herbivores, spines help prevent water loss by reducing air flow close to the cactus and providing some shade. In the absence of leaves, enlarged stems carry out photosynthesis.

So, the correct answer is 'Their leaves are modified into spines'.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Which is the trait that enabled the plants for the first time to colonise themselves on dry land?

  1. Lignified cell wall

  2. Vascular tissue

  3. Cuticle

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

The cuticle is a waxy coating over the surface of leaves and plants. It forms a waterproof coating over the surface of leaves and plants. It prevents water loss from plants and also prevents the plants from getting desiccated. It also prevents the intake of gases into the plants. 

So, option C "Cuticle" is the correct answer.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

In cacti, the succulence is mostly in 

  1. Stem

  2. Leaves

  3. Roots

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

In cacti, the succulence is mostly in the stems because the leaves of the cacti are reduced to thrones to minimize the surface areas and therefor the water evaporation through them. the cacti have a shallow widespread network of roots that enables them to absorb water, therefore the roots are not succulent. the cacti have thick stems that store maximum amount of water in the entire plant. So, the correct answer is 'Stem'.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Phreatophytes are xerophytes with roots

  1. Spread along the soil surface

  2. Well spread in the soil

  3. Very deep reaching ground water fringe

  4. Very deep but well above ground water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A phreatophyte is a deep-rooted plant that obtains a significant portion of the water that it needs from the phreatic zone (zone of saturation) or the capillary fringe above the phreatic zone. Phreatophytes are plants that are supplied with surface water and often have their roots constantly in touch with moisture. These plants have very deep roots that are able to reach the water table. So the correct answer is ' Very deep reaching ground water fringe'. 

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Drought endurers are

  1. Succulent xerophytes

  2. Perennial xerophytes

  3. Annual xerophytes

  4. Both B and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Drought endurers are plants that can survive drought periods by maintaining their physiological functions, typically through deep root systems or water storage, and are usually perennial. Annuals are typically drought escapers.

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

In xerophytic leaf, the stomata are situated 

  1. On both surface

  2. On upper surface

  3. On lower surface

  4. Absend from both surfaces
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The xerophytic plants are the plants present in the desert and other dry environments. The rate of transpiration is high in xerophytic plants due to high temperatures. In order to minimize the rate of transpiration, they have sunken stomata.

Thus, the correct answer is option (C),

Multiple choice botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

Ephemeral xerophytes grow during 

  1. Winter

  2. Spring

  3. Rainy season

  4. All the seasons
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ephemeral xerophytes are drought escapers that complete their entire life cycle very quickly during the short rainy season, remaining as seeds during the dry periods.