Cornelius Van Niel Experiment

Q.

Who described the first action spectrum for photosynthesis?

1. Joseph Priestley

2. Cornelius van Niel

3. Julius von Sachs

4. T. W. Engelmann

Q.

In an experiment studying photosynthesis performed during the day, you provide a plant with radioactivecarbon (14C) dioxide as a metabolic tracer. The 14C is incorporated first into oxaloacetate. The plant is best characterized as a

1. C4 plant.

2. C3 plant.

3. CAM plant.

4. heterotroph.

Q. Who demonstrated that in purple and green sulphur bacteria when $H_{2}S$ is used as hydrogen donor, sulphur is released instead of oxygen?

1. Engelmann
2. Julius von Sachs
3. Van Niel
4. Jan Ingenhousz

Q. Spores in pteridophytes are produced in special structures called

1. antheridia
2. gametangia
3. archegonia
4. sporangia

Q. Which event is considered as a precursor to seed habit?

1. Retention of male sporophyte on parent gametophyte
2. Retention of female sporophyte on parent gametophyte
3. Retention of female gametophyte on parent sporophyte
4. Retention of male gametophyte on parent sporophyte

Q. The early suggestion that oxygen liberated by plants during photosynthesis comes from water was

1. proposed by van Niel
2. confirmed by the use of heavy water
3. made after the discovery of photorespiration because of Rubisco's sensitivity to oxygen
4. Was proposed by van Niel and later confirmed by experiments using heavy water

Q. In Selaginella, microspores germinate to form

1. protonema
2. female gametophyte
3. male gametophyte
4. sporophyte

Q. Which event is considered as a precursor to seed habit?

1. Retention of female sporophyte on parent gametophyte
2. Retention of male sporophyte on parent gametophyte
3. Retention of male gametophyte on parent sporophyte
4. Retention of female gametophyte on parent sporophyte

Q. The examples of heterosporous pteridophytes are

1. Lycopodium and Pteris
2. Selaginella and Salvinia
3. Dryopteris and Adiantum
4. Selaginella and Psilotum

Q. Which of the following plant show origin of heterospory?

1. Pteridophyte
2. Gymnosperm
3. Angiosperm
4. Bryophyte

Q. Which of the following statements is correct?

1. Selaginella is heterosporous, while Salvinia is homosporous.
2. Ovules are not enclosed by ovary wall in gymnosperms.
3. Horsetails are gymnosperms.
4. Stems are usually unbranced in both Cycas and Cedrus.

Q.

Which of these are heterosporous plants?

1. Selaginella

2. Pteris

3. Salvinia

4. Adiantum

Q. Which one of the following categories of organisms do not evolve oxygen during photosynthesis?

1. Red algae
2. $C_4$-plants with Kranz anatomy
3. Photosynthetic bacteria
4. Blue green algae

Q. Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as:

1. Heterosorus
2. Homosporous
3. Heterosporous
4. Homosorus

Q. Microsporangia and megasporangia are found in the same strobilus in:

1. Adiantum
2. Dryopteris
3. Selaginella
4. Pinus

Q. Hydrogen donor in photosynthesis of purple$/$ green sulphur bacteria is

1. $N{H}_3$
2. $H_{2}S$
3. $H_{2}O$
4. $H_{2}S{O}_3$

Q. Strobili or cones are found in

1. Equisetum
2. Salvinia
3. Marchantia
4. Pteris

Q. Which helped in confirming that oxygen evolved in photosynthesis comes from water

1. $H_2^{18}O$
   
2. ${}^{14}C{O}_2$
   
3. ${}^{15}N{O}_3$
   
4. ${}^3{H}_{2}O$

Q. Which of the following is not a feature of Selaginella?

1. Heterospory
2. Homospory
3. Microphylly
4. Presence of strobili

Q. Assertion :Non - autotrophic bacteria carry out chemosynthesis. Reason: Chemosynthetic bacteria trap small amount of energy released from oxidation of inorganic compound to use in the reactions that synthesize carbohydrates.

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

Q. Pick out the correct group consisting of all genera exhibiting homospory

1. Salvinia, Pteris, Lycopodium, Selaginella
2. Equisetum, Psilotum, Lycopodium, Pteris
3. Equisetum, Pteris, Salvinia, Psilotum
4. Lycopodium, Psilotum, Selaginella, Equisetum

Q. Select the incorrect about Equisetum.

1. Produce two types of spores
2. Homosporous
3. Has vascular tissues
4. Has strobili or cones

Q. Read statement ${}^{\prime }a$ to $d^{\prime }$ and find out how many is/are incorrect statement(s).
(a) In majority of the pteridophytes, all the spores are of similar kinds.
(b) Genera like Selaginella and Salvinia produce two kind of spore.
(c) The development of the zygote in the young embryos take place within the female gametophytes. This event is a precursor to the seed habit.
(d) Azolla is an aquatic fern that is used as biofertilizer due to the presence of nitrogen fixing cyanobacteria.

1. $1$
2. $2$
3. $0$
4. $3$

Q.

Which among the following statements is false about pteridophytes?

1. Ferns exhibit circinate vernation

2. Members of pteridophyta are homosporous or heterosporous

3. Sporophytic generation is dominant in pteridophytes

4. The sporophytes of pteridophytes produce the sex organs

Q. Ancestors of seed-bearing plants exhibit:

1. Heterospory
2. Heterotrichous thallus
3. Homospory
4. Alternation of generations

Q. Which among the following exhibit homospory?

1. Cycas
2. Lycopodium
3. Salvinia
4. Selaginella

Q. Choose the correct statements regarding Pteridophytes.

1. Homosporous
2. They do not produce spores
3. Heterosporus
4. Hetrosporus plants produce both microspores and megaspores

Q. Selaginella shows a character of evolutionary importance which is the presence of:

1. Strobilus
2. Rhizophore
3. Heterosporous condition
4. Ligule

Q. How many statements are correct with respect to the precursor of seed habit as seen in advanced pteridophytes?

I. Heterosporous conditions.

II. Functional female gametophyte is retained in the megasporangium (ovule) of the sporophyte.

III. Presence of a hard integument covering the ovule.

IV. Embryo undergoes a resting stage.

1. I, II, & III
2. Only I & II
3. I, II, III & IV
4. Only I

Q.

Which among the following is a prerequisite in Selaginella to exhibit seed habit?

1. Homospory

2. Microphylly

3. Creeping stem

4. Heterospory