Spore Formation

Q.

What are spores?

Q.

Is bread mold a fungus?

Q.

Question 33
Why does bread mould grow profusely on a moist bread slice rather than on a dry bread slice?

Q.

The factors responsible for the rapid spreading of bread mould on slices of bread are :
(i) Presence of a large number of spores in the air.
(ii) Presence of a large number of thread-like branched hyphae.
(iii) Presence of moisture and nutrients.
(iv) Formation of round shaped sporangia.
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (ii)
(d) (iii) and (iv)

Q.

What is an example of budding?

Q. Which of the following is heterosporous?

1. Selaginella
2. Salvinia
3. All of these
4. Azolla

Q. Name one organism which reproduces by spore formation.

Q.

What happens when - on maturation sporangia of Rhizopus bursts?

Q.

What are spores? Write their function.

Q.

When a moist slice of bread was kept aside for a few days then some organism grew on it to form a white cottony mass which later turned black. When this slice of bread was observed through a magnifying glass, then fine thread-like projections and thin stems having bulb-like structures at the top were seen.
(a) What are the common name and scientific name of the organism which grew on the moist slice of bread
(b) How did this organism grow on the moist slice of bread automatically?
(c ) What are the fine, thread-like projections on the surface of a slice of bread known as?
(d) What name is given to the knob-like structures and what do they contain?
(e) What is the name of this method of reproduction?
(f) Name one unicellular organism which reproduces by this method?
(g) Name two non-flowering plants which reproduce by this method.

Q. Question 12
In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called

(a) filaments
(b) hyphae
(c) rhizoids
(d) roots

Q.

In Rhizopus fungus, the fine thread-like structures spread on the whole surface of the slice of bread are called:
(a) rhizoids
(b) stems
(c) roots
(d) hyphae

Q. Factors responsible for the rapid spread of bread mould on slices of bread are:
(i) Large number of spores
(ii) Availability of moisture and nutrients in bread
(iii) Presence of tubular branched hyphae
(iv) Formation of round shaped sporangia
Which of the above statements are true?

1. (i) and (ii)
2. (iii) and (iv)
3. (i) and (iii)
4. (ii) and (iv)

Q.

Are mushroom spores killed by hydrogen peroxide?

Q.

Question 32
Colonies of yeast fail to multiply in water but multiply in sugar solution. Give one reason for this.

Q. Students were asked to observe the permanent slides showing different stages of budding in yeast under high power of a microscope.
(a) Which adjustment screw (coarse/fine) were you asked to move to focus the slides?
(b) Draw three diagrams in correct sequence showing budding in yeast.

Q. The filamentous structure of the fungus is called

Q.

Label the parts of Rhizopus in the picture shown below:

1. A - Stolon , B - Mycelium , C – Sporangia , D - Sporangiophore

2. A - Hyphae , B - Stolon, C – Sporangia , D - Sporangiophore

3. A - Hyphae , B - Stolon , C – Sporangiophore , D - Sporangia

4. A - Stolon , B - Mycelium, C – Sporangiophore , D - Sporangia

Q.

What color are bacterial spores after a gram stain is performed?

Q.

(a) The yeast cells fail to multiply in water but they multiply rapidly in sugar solution. Give one reason for it.
(b) Why does bread mould grow profusely on a moist slice of bread but not on a dry slice of bread?

Q. The tiny blob - like structures involved in reproduction of Rhizopus are ________.

1. cysts
2. sporangia
3. hyphae
4. tentacles

Q. Which part of $Rhizopus$ is involved in the reproduction process?

1. Hyphae
2. Sporangiophore
3. Sporangia
4. Stolon

Q.

(a) Name the method by which bread mould (Rhizopus fungus) reproduces. Is this method sexual or asexual?
(b) What is yeast? Describe the process Of reproduction in yeast with the help of labelled diagrams.
(c) Name a tiny fresh-water animal which reproduces by the same method as that of yeast? What is this method known as?
(d) Name two marine organisms which also reproduce by the same method as yeast but form colonies.

Q.

State whether the following statement is true or false :
Spores produced by the bread mold plant are actually its seeds.

Q.

One of the following reproduces by forming spores. Which is it?
(a) Fern
(b) Planaria
(c) Spirogyra
(d) Potato

Q.

Which structure of bread mould releases spores?

Q. Enlist and Explain giving examples the various methods of vegetative propagation
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Q.

The blob - like structure found at the tips of hyphae in Rhizopus is ________.

1. Rhizoidal hyphae

2. Sporangia

3. Spore-bearer

4. Conidia

Q.

Spore formation is the most common asexual method of reproduction in :
(a) protozoa
(b) tubers
(c) fungi
(d) algae

Q.

Question 32
Colonies of yeast fail to multiply in water but multiply in sugar solution. Give one reason for this.