Translocation

Q. The female gametophyte is multicellular in gymnosperms.

1. False
2. True

Q.

What are the examples of mature cells that lack a nucleus, Would you consider these cells as ‘living’?

Q.

Sieve tubes do not have nuclei, why are they con­sidered as living cells?

Q.

Is cambium present in monocots?

Q.

How is food translocated in plants

Q.

Define translocation of solutes(food).

Q.

An aggregation of cells having the same origin and performing a definite function is called a ___.

1. organ

2. organ system

3. organelle

4. body system

Q. Loading of sucrose into sieve tube cells is done by (i)_______ and the unloading of sucrose from the sieve tube cells is done by (ii)________.

1. Active transport and passive transport

2. Passive transport and active transport

3. Active transport

4. Passive transport

Q.

Translocation of solutes primarily takes place through:

1. Phloem

2. Xylem

3. Cortex

4. Pith

Q.

Why are sieve tubes in gymnosperms and pteridophytes called sieve cells?

Q.

The process by which food substances are moved to different parts of the plant by the phloem tissues is known as

1. respiration

2. photosynthesis

3. translocation

4. transpiration

Q. Companion cells are

1. small, thin walled living, enucleated
2. small, thick walled, living, nucleated
3. living, narrow, elongated, thin walled, nucleated
4. large, thick walled, nucleated

Q.

Transpiration is more when the wind is blowing slowly.

1. Water and sucrose

2. Sugars and hormones

Q.

Transport over longer distances through phloem is called __.

Q. Where are the companion cells located in flowering plants? What is their function?

Q. A mature sieve tube differs from vessel in

1. Being nearly dead
2. Lacking cytoplasm
3. Lacking a functional nucleus
4. Absence of lignified walls

Q.

Scientists use ___ for studying translocation by pholem.

1. Aphids

2. Bees

3. Ants

4. Butterflies

Q. The cell organelle that controls all activities in a cell is called _________.

1. vacuole
2. nucleus
3. cytoplasm
4. plastids

Q.

Commercial cork is a derivative of:

1. Vascular cambium

2. Xylem

3. Phellogen

4. Phloem

Q. The commercial jute fibres are obtained from

1. Interxylary fibres
2. Phloem fibres
3. Xylem fibres
4. None of the above

Q. The difference in phloem of gymnosperms and angiosperms is due to

1. Parenchyma
2. Sieve cell
3. Companion cell
4. Fibres

Q. Which of the following cells is not totipotent?

1. Sieve cell
2. Pith cell
3. Epidermal cell
4. Pollen grain

Q.

Which of the following features is seen in aquatic plants ?

1. thick cuticle

2. well-developed root system

3. sunken stomata

4. aerenchyma tissue

Q. Name two types of sieve elements found in phloem.

Q.

1. C represents the cells which are replaced by albuminous cells in non-flowering plants such as gymnosperm
2. B represents the cells which become dead on maturity
3. A represents phloem parenchyma, which is absent in most monocots.
4. All of these

Q. Companion cells are always associated with

1. Sieve tube
2. Tracheids
3. Sieve cell
4. Vessels

Q. Phloem of angiosperm is different from that of pteridophytes and gymnosperms in

1. The absence of enzymes
2. Presence of endocytosis
3. Presence of companion cells
4. None of the above

Q. Phloem is a complex permanent tissue. Which component of the tissue maintains the pressure gradient in the other component that is mainly responsible for the conduction of food?

1. Companion cells
2. Seive elements
3. Parenchyma
4. Fibres

Q. The chief function of sieve tubes is

1. To translocate the organic materials manufactured in the leaves
2. To transport water from roots to leaves
3. To help the plant in forming wood
4. To conduct minerals

Q. Do the broken up pieces in regeneration has to form a new individual or they may not??