Tag: biology

Questions Related to biology

Which one of the following histogens is present in the roots but Not in the shoots?

biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

  1. Calyptrogen

  2. Dermatogen

  3. Periblem

  4. Plerome

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Correct Option: A
The cells of the quiescent centre are characterised by
biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

  1. having dense cytoplasm and prominent nuclei

  2. having light cytoplasm and small nuclei

  3. dividing regularly to add to the corpus

  4. dividing regularly to add to tunica

Show answer
Correct Option: B
Explanation:

The cells of the quiescent centre are characterised by 'light cytoplasm and small nuclei'.

Choose the correct answers from the alternatives given :
Plant roots function to

biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

  1. anchor the plant

  2. store the products of photosynthesis

  3. produce hormones that stimulate stem growth

  4. all of the above

Show answer
Correct Option: D
Explanation:

Root is the most important organ of a plant which generally lies below the soil in the vascular plants.

The main functions of the root are:
a. It anchors the plants in soil and thus provides mechanical support to plants to stand upright.
b. Photosynthesis products are usually stored in roots. eg. Raddish, carrots etc.
c. Roots synthesize certain hormone that helps in the growth of the plant.

So the correct answer is "All of the above"

Choose the correct answers from the alternatives given.
When a leaf trace extends from a vascular bundle in a dicot stem, what would be the arrangement of vascular tissues in the veins of the leaf

biology anatomy of flowering plants theories of meristematic cell development theories of shoot apical meristem development shoot and root apex

  1. Xylem would be on top and the phloem on the bottom

  2. Phloem would be on top and the xylem on the bottom

  3. Xylem would encircle the phloem

  4. Phloem would encircle the xylem

Show answer
Correct Option: A
Explanation:

Vascular bundles are scattered in the spongy parenchyma. These can be seen in the veins and the midrib of the leaves. The dicot leaves possess reticulate venation in which veins form a network. The xylem forms the top layer and phloem is present at the bottom in the arrangement of the vascular tissues. The veins vary in thickness in the reticulate venation.

Hence, the correct answer is 'Xylem would be on top and the phloem on the bottom'.

Water from the undigested food is absorbed mainly in the

biology food through digestive tract role of large intestine in digestion busy at work - our internal organs parts of the digestive system: structure and function

  1. Stomach

  2. Food pipe

  3. Small intestine

  4. Large intestine

Show answer
Correct Option: D
Explanation:
  • The large intestine, also known as the large bowel, is the last part of the gastrointestinal tract and of the digestive system.Water is absorbed here from the undigested food and the remaining waste material is stored as feces before being removed by defecation.
  • Hence water from the undigested food is absorbed mainly in the large intestine.
  • So,the correct answer is 'Large intestine'.

Which of the following is not the function of large intestine?

biology food through digestive tract role of large intestine in digestion busy at work - our internal organs parts of the digestive system: structure and function

  1. Absorption of water

  2. Nutrient absorption

  3. Secretion of mucus to lubricate faeces

  4. Temporary storage faeces in rectum

Show answer
Correct Option: B
Explanation:
The 4 major functions of the large intestine are:
  • Re-absorption of water and mineral ions such as sodium and chloride.
  • Formation and temporary storage of faeces.
  • Maintaining a resident population of over 500 species of bacteria.
  • Bacterial fermentation of indigestible materials.
  •  So, the correct answer is "Nutrient absorption".

Feces are stored in which of the following part of the body before excretion?

biology food through digestive tract role of large intestine in digestion busy at work - our internal organs parts of the digestive system: structure and function

  1. Anus

  2. Large intestine

  3. Small intestine

  4. All of the above

Show answer
Correct Option: B
Explanation:

The large intestine, also called as the colon or the large bowel, is the last part of the digestive system in vertebrates. Water is absorbed here and the remaining waste material is stored as feces before being removed by defecation.

The colon extracts .......... from solid wastes.

biology food through digestive tract role of large intestine in digestion busy at work - our internal organs parts of the digestive system: structure and function

  1. Water

  2. Salt

  3. Both A and B

  4. Sodium

Show answer
Correct Option: C
Explanation:

The colon is the last part of the digestive system in most vertebrates. It extracts water and salt from solid wastes before they are eliminated from the body and is the site in which large bacterial fermentation of unabsorbed material occurs. Unlike the small intestine, the colon does not play a major role in absorption of foods and nutrients. 

The vermiform appendix is situated at the junction of

biology food through digestive tract role of large intestine in digestion busy at work - our internal organs parts of the digestive system: structure and function

  1. Large intestine and small intestine

  2. Small intestine and duodenum

  3. Anus and rectum

  4. Stomach and duodenum

Show answer
Correct Option: A
Explanation:

The vermiform appendix is also referred to as the vermix or the cecal appendix. It is a blind ended tube connected to the cecum, at the junction of large and small intestine. The appendix is usually located in the right lower quadrant of the abdomen, near the right hip bone.

Vermiform appendix is a part of

biology food through digestive tract role of large intestine in digestion busy at work - our internal organs parts of the digestive system: structure and function

  1. Alimentary canal

  2. Nervous system

  3. Vascular system

  4. Reproductive system

Show answer
Correct Option: A
Explanation:

The vermiform appendix is also referred to as the cecal appendix. It is a blind ended tube connected to the cecum. The appendix is usually located in the right lower quadrant of the abdomen, near the right hip bone. Its position within the abdomen corresponds to a point on the surface known as McBurney's point.