Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology identifying the plants absorption of water from the soil root system the root system

State whether the following statement is true or false.

Hydrotropism is important for plants.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ability to bend and growing the root towards a moisture gradient is essential because plants need water to grow. Water, together with soluble mineral nutrients, is taken up by the root hairs. Then, in vascular plants, water and minerals are transported to all parts of a plant through a lignified transport system called as xylem. The second transport system in vascular plants is called as phloem. The phloem also carries water, not with soluble minerals, but mainly with soluble organic nutrients instead. These organic nutrients are delivered by photosynthesis and are called as photosynthate. 

So, the correct answer is 'True'.

Multiple choice biology identifying the plants absorption of water from the soil root system the root system

Primary roots and its branches constitutes to

  1. Adventitious root system

  2. Tap root system

  3. Fibrous roots

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

A. Adventitious roots are the roots which are produced from other plant parts like stems, leaves etc.

B. Taproot system is the root system where the root develops from the radicle producing primary roots and its branches secondary roots. Here the radicle persists.
C. Fibrous roots are the roots which are short and appear as a bunch when the radicle is absent.
D. Seminal roots are temporary roots which are present during ungerminated caryopsis.
So, the correct answer is 'Tap root system'.

Multiple choice biology identifying the plants absorption of water from the soil root system the root system

Root cap takes part in

  1. Formation of new cells

  2. Absorption of water and minerals

  3. Protection of root meristem

  4. Storage of food
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Root cap takes part in the protection of root meristem because it is the layer separating the meristem from the external forces. It protects the tender apex while root makes its way into the soil.

So, the correct option is 'Protection of root meristem'.

Multiple choice movement in plants living world of plants - plant physiology biology

On touching the leaves of Mimosa pudica, it droop down because of 

  1. Seismonasty

  2. Hydrotropism

  3. Chemonasty

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

Thigmonasty or seismonasty is the nastic response of a plant or fungus to touch or vibration. Examples are many species in the leguminous subfamily, Mimosoideae, active carnivorous such as Dionaea and a wide range of pollination mechanisms.

Multiple choice movement in plants living world of plants - plant physiology biology

Which movement occurs due to external stimulus?

  1. Tropic

  2. Nastic

  3. Tactic

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

External stimulus induces tropic, nastic and tactic movements.

  1. Tropic movement - biological phenomenon indicating growth or turning movement of a plant, in response to an external stimuli.
  2. Nastic movements - Non-directional responses in response to external stimulus
  3. Tactic movements - It includes phototactic, chemotactic and thermotactic movements.

Multiple choice movement in plants living world of plants - plant physiology biology

When spontaneous process occurs then free energy of a system _______________.

  1. Decreases

  2. Increases

  3. Remains same

  4. Either can decreases or increase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the second law of thermodynamics, spontaneous processes in a system at constant temperature and pressure occur with a decrease in Gibbs free energy.

Multiple choice movement in plants living world of plants - plant physiology biology

Nastic movements differ from tropic movements in being

  1. Movements of variation

  2. Nondirectional

  3. Directional

  4. Stimulated by chemicals
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nastic movements are non-directional movements in which direction of response or movement is determined by the structure of responsive region. Nastic movement for instance, could be due to changes in the turgor pressure.

Multiple choice movement in plants living world of plants - plant physiology biology

Movement of plant part in response to touch is 

  1. Seismonasty

  2. Photonastic

  3. Nutation

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

Seismonasty is defined as the nastic movement in response to shock, especially rapid folding of te leaflets of the sensitive plant due to changes in turgor pressure caused by vibration. It is also called as thigmonasty, because the external stimuli is touch.