Tag: life in water

Questions Related to life in water

Finely dissected leaf may be an adaptation of

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

  1. xerophytes

  2. psammophytes

  3. halophytes

  4. hydrophytes

Show answer
Correct Option: D
Explanation:

Many hydrophytes have production of different forms of leaves in the same plant i.e., heterophylly. In submerged aquatics with free-floating aerial leaves, the submerged leaves are generally linear, ribbon-shaped or finely dissected while the aerial leaves are complete and rounded or lobed.


So, the correct answer is " hydrophytes ".

Which one of the following sets consists only of xerophytes plants?

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

  1. Suhabool, Teak, Eucalyptus, mango

  2. Baman, Acacia, Ziziphus, teak

  3. Safflower, eucalyptus, asparagus, acacia

  4. Acacia, prosopis, ziziphus, opuntia

Show answer
Correct Option: A

Read the following statements about adaptations in desert plants and select the correct ones. 
(i) They have a thick cuticle on their leaf surface 
(ii) They have stomata present in deep sunken pits. 
(iii) They use CAM pathway for photosynthesis.
(iv) They have flattened stems and large sized leaves.
(v) Their stomata remain closed during the day.  

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

  1. (i), (ii) and (iii)

  2. (ii), (iii) and (v)

  3. (i), (ii) and (iv)

  4. (i), (ii), (iii) and (v)

Show answer
Correct Option: D
Explanation:
Xerophytes can withstand a prolonged period of drought, for this purpose they have certain peculiar adaptations. Thick cuticle is present in these plants. Stomata are generally sunken (deep seated) and open during night only. They have CAM pathway for photosynthesis. Leaves are generally small and scaly. Sometimes leaves are modified into spines to reduce water loss through transpiration.They generally have an extensive root system and a smaller shoot system.Stems may be modified to phylloclades or dadoes to carry out the function of photosynthesis.
So, the correct answer is '(i), (ii), (iii) and (v)'.

The correct sequence of plants in hydrosphere is :

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

  1. $Oak \rightarrow Lantana \rightarrow Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus$

  2. $Oak \rightarrow Lantana \rightarrow Scirpus \rightarrow Pistia \rightarrow Hydrilla \rightarrow Volvox $

  3. $Volvox \rightarrow Hydrilla \rightarrow Pistia \rightarrow Scirpus \rightarrow Lantana \rightarrow Oak$

  4. $Pistia \rightarrow Volvox \rightarrow Scirpus \rightarrow Hydrilla \rightarrow Oak \rightarrow Lantana$

Show answer
Correct Option: C

Plants which grow in shade are called

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

  1. Sciophytes

  2. Heliophytes

  3. Oxylophytes

  4. Epiphytes

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Correct Option: A

Resource partinotiong can only take place when

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

  1. Species have different feeding manner

  2. Species only have different foraging manner.. no matters feeding type different or same

  3. Different fedding and foraging time

  4. None

Show answer
Correct Option: B
Explanation:

Resource partitioning is the phenomenon of evolutionary changes seen in species in response to the selection pressure generated by interspecific competition. Due to this, no two organisms within the same species can coexist in the same niche if they have same resources. They have different foraging manner whether feeding type is different or same. Example of resource partitioning involves two tigers present in their own territories or niches and defending it from other tigers. 

Thus, the correct answer is option B.

Excessive aerenchyma tissues in the plants is mainly an adaptation for.

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

  1. Xerophytes condition

  2. Hydrolytic condition

  3. Epiphytic condition

  4. Niesophytic condition

Show answer
Correct Option: A

The most effective defence of plants against herbivores are

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

  1. Morphological

  2. Chemical

  3. Temporal

  4. Developmental

Show answer
Correct Option: A
Explanation:

To counter the herbivore attack, plants produce specialized morphological structures or secondary metabolites and proteins that have toxic, repellent effects on the herbivores. Plants confront the herbivores both directly by affecting host plant preference or survival and reproductive success (direct defense), and indirectly through other species such as natural enemies of the insect pests (indirect defense). Direct defenses are mediated by plant characteristics that affect the herbivores biology such as mechanical protection on the surface of the plants (e.g., hairs, trichomes, thorns, spines, and thicker leaves) or production of toxic chemicals such as terpenoids, alkaloids, anthocyanins, phenols, and quinones) that either kill or retard the development of the herbivores.

Submerged hydrophytes have commonly dissected leaves for

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

  1. Decreasing surface area

  2. Increasing surface area

  3. Reducing effect of water currents

  4. Both B and C

Show answer
Correct Option: D
Explanation:

The submerged leaves are often highly dissected or divided. This has the advantage of creating a very large surface area for absorption and photosynthesis. It also minimises water resistance and hence, potential damage to the leaves since moving water (currents and waves) can be damaging to the leaves of the plant.

In xerophytes, photosynthesis, often occurs through

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

  1. Root

  2. Modified stem

  3. Stomata

  4. Scaly leaves

Show answer
Correct Option: B
Explanation:

Xerophytes are plants, that have small amount of water or moisture, so they have adaptations that allow them to survive in these harsh conditions. These plants are like cactus and other succulents are typically found in deserts. 

Xerophytes have a shortage of water, so have special adaptive features to store or reduce the loss of water, so that photosynthesis and respiration can be carried out. 
For e.g., in Cacti the leaves have become spines, so therefore photosynthesis occurs in the stem. It has many packed cells in the cortex, that can easily store water and the epidermis has a tick waxy cuticle, that reduces water loss. The cacti can close its stomata during the day decreases water lost and then open it at night to let in $CO _2$ for photosynthesis. This photosynthesis process is called as the CAM photosynthesis.