Tag: biology

Questions Related to biology


Faeces in the body is stored in

biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food

  1. duodenum

  2. ileum

  3. rectum

  4. caecum

Show answer
Correct Option: C
Explanation:

Food is broken down in the digestive tract until it passes all the way through the small and large intestine and is stored in the rectum as the stool. The body has a system for sending a signal when the rectum is full and needs to be emptied

So, the correct option is 'rectum'

Which of the following is an intestinal disorder?

biology digestion and absorption assimilation of food and egestion assimilation of food components and importance of food

  1. Gastrointestinal stromal tumors

  2. Cystic fibrosis

  3. Peptic ulcers

  4. All the above

Show answer
Correct Option: D
Explanation:

A) Gastrointestinal stromal tumors are most accurately found in the stomach or intestine but can be found in any part of the digestive tract and can be malignant or benign.

B) Cystic fibrosis is the genetic disorder that affects mucus, sweat and digestive glands majorly affect the lungs and digestive tract especially stomach and small intestine.
C) The peptic ulcer is the sores on the lining of the duodenum of the intestine and known as a duodenal ulcer.
So, the correct option is 'All of the above'

Hormone involved in phototropism is ____________.

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. IAA

  2. gibberellin

  3. kinetin

  4. 2, 4-D.

Show answer
Correct Option: A
Explanation:

Phototropic curvature is the result of uneven distribution of auxin. Darwin and Darwin observed that the coleoptiles of canary grass responded w unilateral illumination by growing towards the light source (phototropism). After a series of experiments, It was concluded that the tip of coleoptile contains auxin that caused the bending of the entire coleoptile in relation to the direction of light.

Which plant hormone induces the phenomenon of phototropism in plants?

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Auxins

  2. Ethylene

  3. Cytokinin

  4. Gibberellin

Show answer
Correct Option: A
Explanation:

Auxins induce phototropism in plants, that growth of a plant part towards light (shoot) or away from light (root). 

Auxins bring about elongation and growth of the shoot towards light, being sensitive to light accumulate in the region opposite to the direction in which growth has to take place, here it brings about elongation of the cells and growth of the shoot in the direction of light.
So, the correct answer is 'Auxins'

Growth of pollen tube towards embryo sac is?

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Chemotropic

  2. Thigmotaxis

  3. Geotropic

  4. None of these

Show answer
Correct Option: A
Explanation:

The pollen tube paves its way through the solid part of the stigma and style by secreting pectinases and hydrolytic enzymes. Pollen tube travels inter-cellularly and chemotropically along the concentration gradient of calcium-boron-Inositol sugar complex.

Example of positive geotropism is 

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Closing of flowers

  2. Upwards growth of stem

  3. Downward growth of root

  4. Lateral growth of root

Show answer
Correct Option: C
Explanation:

Positive geotropism is the movement towards earth. In the case of roots, they grow towards the earth and are thus, called as positively geotropic. Whereas shoots are negatively geotropic.

Geotropic response is perceived by

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Mature roots

  2. Elongating cells

  3. Root cap

  4. Root hairs

Show answer
Correct Option: C
Explanation:
Geotropic stimulus is perceived by root cap in case of root and by stem apex in case of stem. Geotropic stimulus is perceived by root cap because it is the adjacent part in touch with soil. In the case of aquatic plants, the plant has root pocket instead of root cap in terrestrial plants
So, the correct answer is 'Root cap'

Irritability/Reactivity/Sensitivity of a plant is

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Response to stimulus in soil

  2. Response to a change in environment

  3. Movement caused by an external force

  4. Ability to move

Show answer
Correct Option: B
Explanation:

Irritability, reactivity and sensitivity are excitatory response shown by plants to respond to changes in their environment. The most common response shown by plants is movement in response to environment change. For example, closing of leaves of Mimosa pudica on touching or closing of traps on a Venus fly trap.

Thus, the correct answer is option B. 

The site which receives the phototropic stimulus is

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Shoot apex (tip)

  2. Root apex (tip)

  3. Meristematic regions

  4. Leaves

Show answer
Correct Option: A
Explanation:

The area of the plant which receives a stimulus is called as perceptive region. Tip or apex of the shoot is the perceptive region for the light. It is the site which receives the phototropic stimulus and shows corresponding response. 

Thus, the correct answer is option A.

The movement of plant organs in response to force of gravity is called

biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

  1. Phototropism

  2. Thigmotropism

  3. Geotropism

  4. Chemotropism

Show answer
Correct Option: C
Explanation:

The movement of plant part in response to contact with a solid touch is called as thigmotropism. The movement of plant part in response to light is called as phototropism. The movement of plant part in response to force of gravity is called as geotropism. The movement of plant part in response to external chemical stimulus is called as chemotropism.

Thus, the correct answer is option C.