Q. No.What would be true regarding reproduction by ‘zoospores’ in algae and fungi?
1.
While they are produced in sexual reproduction in algae, in fungi they are produced in asexual reproduction.
2.
While they are produced in sexual reproduction in fungi, in algae they are produced in asexual reproduction.
3.
They are flagellated and motile in algae and non-motile in fungi.
4.
They are motile and produced in asexual reproduction in both algae and fungi.
Identify the correct statement regarding members of Phaeophyceae:
1. The main photosynthetic pigment is fucoxanthin and chlorophyll a is absent.
2. The stored food is in the form of mannitol and laminarin is toxic to them.
3. Their cell walls have algin and polysulphate esters.
4. The flagellar number is 2, unequal in size and attached laterally.
Match the terms in Column I with their correct description in Column II and select the correct match from the codes given:
| COLUMN I | COLUMN II | ||
| A | Protonema | P | The first stage in development of the gametophyte in mosses. |
| B. | Prothallus | Q | The photosynthetic gametophyte in ferns. |
| C. | Seta | R | In bryophytes, the stalk that supports the capsule, if present. |
| D. | Stipe | S | The stem-like part of the thallus of brown algae such as kelp |
Codes
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | P | R | S |
| 3. | P | Q | S | R |
| 4. | Q | P | S | R |
Identify the correctly matched pair:
| Pteriodophyte | Class | |
| 1. | Psilopsida | Adiantum |
| 2. | Lycopsida | Selaginella |
| 3. | Sphenopsida | Dryopteris |
| 4. | Pteropsida | Equisetum |
The terms that can be applied to all gymnosperms include:
| 1. | Naked seeds, Homosporous, Dominant independent sporophyte |
| 2. | Seeds enclosed in ovary wall, Heterosporous, Dominant independent sporophyte |
| 3. | Naked seeds, Heterosporous, Dominant independent sporophyte |
| 4. | Naked seeds, Heterosporous, Dominant independent gametophyte |
Chemotaxonomy is defined by the Merriam-Webster dictionary as ‘the method of biological classification based on similarities and dissimilarities in the structure of certain compounds among the organisms being classified’. There is an argument that proteins are more reliable of genetic relationships. Which of the following most strongly supports the argument?
| 1. | Almost all enzymes are proteins |
| 2. | Proteins in living organisms are more closely controlled by genes. |
| 3. | The primary structure of proteins is very easy to determine. |
| 4. | A ribozyme catalyses the formation of peptide bond leading to the formation of proteins. |
Consider the given two statements:
| I: | The older botany term ‘vascular cryptogams’ can be applied to the pteridophytes. |
| II: | Pteridophytes do not produce seeds but have vascular or conducting system. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
| COLUMN I | COLUMN II | ||
| A | Pigment | P | Fucoxanthin |
| B | Stored food | Q | Phycoerythrin |
| C | Cell wall | R | Floridean starch |
| D | Flagella | S | Laminarin |
| T | Polysulfate esters | ||
| U | Algin | ||
| V | 2-8. equal, apical | ||
| W | Absent |
Codes:
| A | B | C | D | |
| 1. | Q | R | T | W |
| 2. | P | S | U | V |
| 3. | Q | R | U | W |
| 4. | P | S | T | V |
| Assertion (A): | The spread of living pteridophytes is limited and restricted to narrow geographical regions. |
| Reason (R): | Evolutionarily, pteridophytes are the first terrestrial plants to possess vascular tissues – xylem and phloem. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
| 1. | Cycas is a gymnosperm and Pinus is a pteridophyte |
| 2. | The gametophyte is dominant in the life cycle of Cycas and the sporophytes is dominant in the life cycle of Pinus |
| 3. | Roots of Pinus have mycorrhiza association and coralloid roots of Cycas are associated with nitrogen-fixing cyanobacteria |
| 4. | In Pinus, the male and female cones are borne on different trees and in Cycas on the same tree |
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