Explain different types of elements present in the phloem.

1.	Explain different types of elements present in the phloem.
Answer» Phloem is a living tissue in vascular plants which conducts the soluble organic compounds synthesized during photosynthesis downwards from the leaves. The constituents of phloem are: • Companion cells – it appears to check the activity of the adjacent sieve element and participates in loading and unloading of the sugar into the sieve element • Sieve tubes – these elongated living cells, conveys carbohydrates, chiefly sucrose from leaves to roots and fruits • Phloem fibres – they are commercially useful as they possess great pliability and tensile strength • Phloem parenchyma – also known as transfer cells, they are found near the finest branches, ends of sieve tubes in leaf veinlets, functional here in conveying food

Answer»

Phloem is a living tissue in vascular plants which conducts the soluble organic compounds synthesized during photosynthesis downwards from the leaves.

The constituents of phloem are:

• Companion cells – it appears to check the activity of the adjacent sieve element and participates in loading and unloading of the sugar into the sieve element

• Sieve tubes – these elongated living cells, conveys carbohydrates, chiefly sucrose from leaves to roots and fruits

• Phloem fibres – they are commercially useful as they possess great pliability and tensile strength

• Phloem parenchyma – also known as transfer cells, they are found near the finest branches, ends of sieve tubes in leaf veinlets, functional here in conveying food

Discussion

No Comment Found

Related InterviewSolutions

(a) Idendity the figure. b) Labels the parts marked 1 to 3. (c) Write the functions of parts marked 1 and 3.
(a) Identify the tissue. (b) Labels the parts marked 1,2 and 3. (c) What type of this tissue and where it occurs in body
A person met with an accident in which two long bones of hand were dislocated. Which among the following may be the possible reason ?A. tendon breakB. break of skeletal muscles tissueC. ligament breakD. areolar tissue break
A person met with an accident in which two long bones of hand were dislocated. Which among the following may be the possible reason? A. Tendon break B. Break of skeletal muscle C. Ligament break D. Areolar tissue break
Which cell does not have performed cell wall ?A. TracheidsB. Companion cellsC. Sieve tubesD. Vessels
A person met with an accident in which two long bones of hand were dislocated. Which among the following may be the possible reason ?A. Tendon breakB. Break of skeletal muscleC. Ligament breakD. Areolar tissue break
Given below are three figures A, B and C. (a) Identify figure A , B and C. (b) Which one is commerically exploited to get jute and hemp ? (c) Which one is modified to store products? (d) Which one has deposition of lignin ? (e) Which one of these provides both mechanical strength and flexibility?
(i) Which type of tissues is affected by HIV infection ? (ii) List any two precautios one should take to prevent spread of AIDS ? (iii) Is it necessary to isolate AIDS patients from healthy ones ? Comment.
(i) Which tissue is responsible for storage of fat in the body ? (ii) How can we control obesity ? (iii) What are the effects the morning walk and regular physical exercise on obesity ?
What are the main functions of nervous tissue ?