General
✓✗Red algae can grow at great depths in the sea because
- they have no chlorophyll
- they are heterotrophic
- their pigment phycoerythrin can absorb the light that penetrates deep water
- they store mannitol
General
✓✗In a haplontic life cycle, the dominant, photosynthetic, free-living phase is the
- zygote
- haploid gametophyte
- diploid sporophyte
- spore mother cell
General
✓✗Bryophytes are attached to the substratum by
- rhizoids
- true roots
- haustoria
- holdfasts
General
✓✗Assertion: The seeds of gymnosperms are naked.
Reason: In gymnosperms the ovules are not enclosed by an ovary wall, before or after fertilisation.
Reason: In gymnosperms the ovules are not enclosed by an ovary wall, before or after fertilisation.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗A plant having seeds but lacking flowers and fruits belongs to
- pteridophytes
- mosses
- ferns
- gymnosperms
General
✓✗Match the algal class with its stored food and cell wall.
| Class | Stored food | Cell wall |
| (a) Chlorophyceae | (i) Mannitol, laminarin | (p) Cellulose, pectin and polysulphate esters |
| (b) Phaeophyceae | (ii) Floridean starch | (q) Cellulose and algin |
| (c) Rhodophyceae | (iii) Starch | (r) Cellulose |
- (a)-(iii)-(r), (b)-(ii)-(q), (c)-(i)-(p)
- (a)-(iii)-(r), (b)-(i)-(q), (c)-(ii)-(p)
- (a)-(ii)-(r), (b)-(i)-(q), (c)-(iii)-(p)
- (a)-(iii)-(q), (b)-(i)-(r), (c)-(ii)-(p)
General
✓✗Members of Phaeophyceae are found primarily in
- marine habitats
- fresh water
- hot springs
- moist soil
General
✓✗Which of the following are useful for curing goiter?
- Sea kelps
- Diatoms
- Red algae
- Porphyra
General
✓✗In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have
- 12
- 18
- 6
- 24
General
✓✗Protonema is a characteristic feature of
- fern
- Marchantia
- moss
- Cycas
General
✓✗Sunken stomata in conifer leaves help mainly to
- increase photosynthesis
- increase transpiration
- trap insects
- reduce water loss
General
✓✗The botanical name of "Sanjeevani" is
- Selaginella utricularia
- Selaginella bryopteris
- Selaginella crotalaria
- Selaginella botardia
General
✓✗The antherozoids of fern are
- Uniflagellate
- Biflagellate
- Quadriflagellate
- Multiflagellate
General
✓✗Nucellus of gymnosperms has 64 chromosomes and its endospermic cells will have
- 64
- 128
- 192
- 32
General
✓✗Pinus seed is
- monocotyledonous
- dicotyledonous
- polycotyledonous
- tetracotyledonous