InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
Endosperm formation is suppressed inA. LiliaceaeB. CyperaceaeC. Orchidaceae and PodostemonaceaeD. Gramineae |
|
Answer» Correct Answer - C Endosperm formation is suppressed in family orchidaceae (orchid) and podostemonaceae (podastemon). |
|
| 902. |
Name the type of flower which favours cross pollination. |
| Answer» The flowers which favour cross pollination are chasomogamous. . They develop exposed anthers and stigma. | |
| 903. |
When male gametes are carried through a pollen tube, it refers to:A. ApogamyB. SyngamyC. SiphonogamyD. Aplanospory |
| Answer» Correct Answer - C | |
| 904. |
Heaping of soil around base of stem in Potato is meant forA. Preventing exposure of rootsB. Providing extra support to delicate stemC. Inducing development of more axiliary shootsD. Making more water available |
|
Answer» Correct Answer - C Heaping of soil around base of stem in Potato is meant for inducing development of more auxiliary shoots. |
|
| 905. |
Heterostyly as a contrivance for cross-pollination is found inA. PennisetumB. ImpatiensC. Primula bulgarisD. Oenothera |
|
Answer» Correct Answer - C Heterostyly is the presence of 2-3 types of flower with different heights of styles and stamens. In diheterostyly (dimorphic heterostyly), there are two types of flower, pin eyed (long style and short stamens) and thrum eyed (short style and long stames), e.g., Primula vulgaris (primrose), jasmine. |
|
| 906. |
Double fertilization isA. Fusion of two male gametes of a pollen tube with two different eggsB. Fusion of one male gamete with two polar nucleiC. Fusion of two male gametes with one eggD. Syngamy and triple fusion |
|
Answer» Correct Answer - D Double fertilization is syngamy and triple fusion. |
|
| 907. |
In angiosperm , microsporogenesis and megasporogenesis :A. Occur in ovuleB. Occur in antherC. Form gametes without furthers divisionsD. Involve meiosis |
| Answer» Correct Answer - D | |
| 908. |
During microsporogenesis, meiosis occurs inA. endotheciumB. microspore mother cellsC. microspore tetradsD. pollen grains |
| Answer» Correct Answer - b | |
| 909. |
Meiosis is best observed in dividingA. cells of apical meristemB. cells of lateral meristemC. microspores and anther wallD. microsporocytes |
|
Answer» Correct Answer - D Microsporocytes or microspore mother cells are diploid cells formed from sporogenous cells in the anther. The pollen/microspore mother cells undergo meiosis and form tetrads of microspores or pollen grains. The wall of pollen mother cell degenerates and pollen or microspores separate. |
|
| 910. |
Double fertilisation is fusion ofA. two eggsB. two eggs and polar nuclei with pollen nucleiC. one male gamete with egg and other with synergidD. one male gamete with egg and other with secondary nucleus |
|
Answer» Correct Answer - D Double fertilisation deals with the fusion of one male gamete with egg to form zygote and the other male gamete with secondary nucleus to form Primary Endosperm Nucleus (PEN). |
|
| 911. |
Point out the odd oneA. nucellusB. embryo sacC. micropyleD. pollen grain |
|
Answer» Correct Answer - D Nucellus is the parenchymatous nutritive tissue of ovule, micropyle is the pore present in the integuments at one end of ovule and embryo sac represents the female gametophyte. Thus, nucellus, microphyle and embryo sac are part of ovule, whereas, pollen grain/microspore represents the immature male gametophyte. |
|
| 912. |
Pollination occurs inA. bryophytes and angiospermsB. pteridophytes and angiospermsC. angiosperms and gymnospermsD. angiosperms and fungi |
|
Answer» Correct Answer - C Pollination is the transfer of pollen grains from anther to stigma of same or different flower. It is a charateristic features of higher plants, i.e. angiosperm and but also found in few gymnosperms. |
|
| 913. |
4-celled embryo sac occurs in:A. Polygonum type embryo sacB. Oenothera type embryo sacC. allium type embryo sacD. None of the above |
| Answer» Correct Answer - B | |
| 914. |
Ovule is attached to placenta of ovary wall by:A. FunicleB. HilumC. RapheD. Chalaza |
| Answer» Correct Answer - A | |
| 915. |
Which one of the following statements is not true ?A. Pollen grains of many species cause severe allergies.B. Stored pollen in liquid nitrogen can be used in the crop breeding programmes.C. Tapetum helps in the dehiscence of anther.D. Exine of pollen grains is made up of sporopollenin. |
|
Answer» Correct Answer - C `**` In a transverse section a typical microsporangium appears near circular in outline. It is generally surrounded by four wall layers the epidermis, endothecium, middle layers and the tapetum. `**` The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen. `**` The innermost wall layer is the tapetum.It nourishes the developing pollen grains. Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus (multinucleate or polyploid). |
|
| 916. |
During formation of pollen grains, a microspore mother cell undergoesA. One meiotic divisionB. One mitotic divisionC. One meiotic and one mitotic divisionD. One meiotic and two mitotic divisions |
|
Answer» Correct Answer - A As the anther develps, the cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads. As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains. |
|
| 917. |
In an angiosperm, how many microspore mother cells are required to produce 100 pollen grains?A. 25B. 50C. 75D. 100 |
|
Answer» Correct Answer - A |
|
| 918. |
In over 60 percent of angiosperms, pollen grains are shed atA. Two -celled stageB. Three-celled stageC. Four-celled stageD. Either A and B |
|
Answer» Correct Answer - A In over 60 per cent of angiosperms (mostly dicots), pollen grains are shed at 2-celled stage. In the remaining species, the generative cell divide mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). |
|
| 919. |
Fill in the blanks : E. The winged ...... of pine are found hundreds kilometers away from the parent plant. |
| Answer» Correct Answer - pollen. | |