Sieve Tube Elements

Q. Cell organelle, which divides the intracellular space into luminal and extra luminal compartments and contain rough surface, is frequently observed in the cells actively involved in:

1. Protein synthesis
2. Lipid synthesis
3. Carbohydrate synthesis
4. r-RNA synthesis

Q.

Phloem in gymnosperms lack:

1. Both sieve tubes and companion cells

2. Albuminous cells and sieve cells

3. Sieve tubes only

4. Companion cells only

Q. The function of sieve tubes is to

1. Translocate water and minerals
2. Sieve the passing substances
3. Eliminate water from organic food
4. Translocate organic food

Q.

What are phloem proteins?

Q. Assertion: Long-distance flow of photoassimilates in plants occurs through sieve tubes.
Reason: Mature sieve tubes have parietal cytoplasm and perforated sieve plates.

1. If both assertion and reason are true and the reason is a correct explanation of the assertion
2. If both assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Q. Identify A, B and C of phloem :

1. A = Companion cell, B = Phloem parenchyma, C = Sieve tube
2. A = Sieve tube, B = Phloem parenchyma, C = companion cell
3. A = phloem parenchyma, B = Companion cell, C = Sieve tube
4. A = companion cell, B = Sieve tube, C = phloem parenchyma

Q.

Question 1

A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is

(a) absence of mitochondria (b) presence of cell wall

(c) presence of haemoglobin (d) absence of nucleus

Q.

Callose plugs are formed during winter -

1. On the walls of vessels

2. On sieve plates

3. On the walls of sclereids

4. In the end walls of tracheids

Q.

Programmed cell death (PCD) is a tightly regulated process that is important in the growth and development of plants. In plants there are several tissues which become functional after undergoing PCD. Which of the following cells/tissues represent “functional corpses” arising due to PCD in plants?
(i) Cork cells in bark.
(ii) Sieve elements of phloem.
(iii) Companion cells of phloem.
(iv) Tracheary elements of xylem.
(A) (i) and (ii) only. (B) (ii), (iii) and (iv) only.

(C) (i) only. (D) (i) and (iv) only.

Q. What will happen to a cell if its nucleus is removed?

Q. Which of the following is enucleate at maturity?

1. Companion cell
2. Meristemic cell
3. Parenchyma cell
4. Sieve tube cell

Q. The function of sieve tubes is to

1. Translocate water and minerals
2. Translocate organic food
3. Sieve the passing substances
4. Eliminate water from organic food

Q.

Callus, that is found in sieve tubes, is a type of __

Q.

Write the precise function of

(a) sieve tube

(b) interfascicular cambium

(c) collenchyma

(d) aerenchyma

Q. Sieve tube cells are in nature.

1. uninucleate
2. multinucleate
3. enucleate
4. syncytial

Q. Companion cells are closely associated with

1. Guard cells
2. Sieve elements
3. Vessel elements
4. Trichomes

Q. Sieve tube is

1. enucleated
2. nucleated
3. multinuclated
4. dead cells

Q.

Given below is the diagram of L.S of bark region of a plant. Choose the answer with the correct combination of parts and alphabets.

1. A = lenticular opening, B = complementary cells C = phellem, D = phellogen, E = phelloderm

2. A = hydathode, B = epithem, C = phellem, D = phellogen, E = phelloderm

3. A = lenticular opening, B = cortex, C = phellogen, D = phellem, E = phelloderm

4. A = stoma, B = secondary cortex, C = phellem, D = phellogen, E = phelloderm

Q.

Given below is an example of a certain structure and its special functional activity. On a similar patterns fill in the blanks with suitable functions:

Example: Chloroplast and Photosynthesis

(i) Xylem and ____________.

Q.

what do u mean by sieving property of agarose gel?

Q.

Sieve tube cell is

1. uninucleate

2. multinucleate

3. dead

4. enucleate

Q.

Callose plugs are formed during winter in _________.

1. in the end walls of tracheids

2. on sieve plates

3. on the walls of vessels

4. on the walls of sclereids

Q. In which of the following xylem lacks vessels while phloem is devoid of companion cells?

1. Pinus
2. Euglena
3. Rhizopus
4. Spirogyra

Q. Sieve tube is

1. enucleated
2. nucleated
3. multinuclated
4. dead cells

Q. Fit in the correct molecules A to L from the following list in respective to size of organelles, organisms or cells.
1. Chloroplast, 2. T${}_2$ phage, 3. Human body, 4. Ribosomes, 5. Plant and animals cells, 6. Lipids, 7. Hydrogen atoms, 8. Protein, 9. Most bacteria, 10. Small molecules - sugar, 11. Nerve cell, 12. Fish egg

1. A- 7, B- 10, C- 6, D- 8, E- 4, F- 2, G- 1, H- 9, I- 5, J- 12, K- 11, L- 3
2. A- 10, B- 7, C- 6, D- 8, E- 4, F- 2, G- 1, H- 9, I- 5, J- 12, K- 11, L- 3
3. A- 7, B- 10, C- 8, D- 6, E- 4, F- 2, G- 1, H- 9, I- 5, J- 12, K- 11, L- 3
4. A- 7, B- 10, C- 6, D- 8, E- 2, F- 4, G- 1, H- 9, I- 5, J- 12, K- 11, L- 3

Q.

Seive tubes are characterized by

1. perforated oblique septa

2. perforated longitudinal walls

3. simple oblique septa

4. absence of septa

Q. Assertion :In angiosperm, the conduction of water is more efficient, because xylem contain vessels. Reason: Conduction of water by xylem vessels elements is an active process with energy supplied by xylem parenchyma, rich in mitochondria.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q. Do Ostrich egg contains endoplasmic reticulum, golgi apparatus, nucleus and other cell organelles? As it is a cell

Q. Sieve tube cells are in nature.

1. uninucleate
2. multinucleate
3. enucleate
4. syncytial

Q.

Callus, that is found in sieve tubes, is a type of __