Q&A - Ask Doubts and Get Answers

Sort by :
Clear All
Q

The ciliated epithelial cells are required to move particles or mucus in a specific direction. In human, these cells are mainly present in :

  • Option 1)

    Bile duct and Bronchioles

  • Option 2)

    Fallopian tubes and Pancreatic duct

  • Option 3)

    Eustachian tube and Salivary duct

  • Option 4)

    Bronchioles and Fallopiun tubes

  Ciliated epithelium - Single layer of columnar or cuboidal cells bearing cilia on their surface. - Contains goblet cells (secretory cells) in some locations. - wherein Locations - Upper respiratory tract, uterine (fallopian) tube, uterus, paranasal sinuses, ventricles of brain & spinal central canal (ependyma). Functions - Moves mucous and other substances by ciliary action, movement of...

Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth :

 

  • Option 1)

    Pharynx  \rightarrow Oesophagus \rightarrow Crop \rightarrow Gizzard \rightarrow Ileum \rightarrow Colon \rightarrow Rectum

  • Option 2)

    Pharynx  \rightarrow Oesophagus \rightarrow  Gizzard \rightarrow Crop \rightarrow Ileum \rightarrow Colon \rightarrow Rectum

  • Option 3)

    Pharynx  \rightarrow Oesophagus \rightarrow  Gizzard \rightarrow  Ileum \rightarrow Crop \rightarrow Colon \rightarrow Rectum

  • Option 4)

    Pharynx  \rightarrow Oesophagus \rightarrow  Ileum \rightarrow Crop \rightarrow Gizzard \rightarrow Colon \rightarrow Rectum

 
  Alimentary canal of cockroach - The alimentary canal of cockroach is divided into three parts, foregut, midgut, and hindgut.  - wherein Foregut (stomodeum) is differentiated into five parts. Buccal chamber or mouth cavity, pharynx, oesophagus, crop and gizzard        The alimentary canal of cockroach has the following organs in order...

Persistent nucellus in the seed is known as:

 

  • Option 1)

    Chalaza

  • Option 2)

    Perisperm

  • Option 3)

    Hilum

  • Option 4)

    Tegmen

Nucellus is the central tissue of ovules that contains the embryo sac. In some seeds like black pepper, it presists after the double fertilization. The persistent nucellus is called perisperm. It performs nutritive function.Option 1)ChalazaOption 2)PerispermOption 3)HilumOption 4)Tegmen

Pholem in gymnosperms lacks:

  • Option 1)

    Albuminous cells and sieve cells

  • Option 2)

    Sieve tube only

  • Option 3)

    Companion cells only

  • Option 4)

    Both sieves tubes and companion cells

 
  Elements of Phloem - Sieve element, campanion cells, phloem parenchyma and phloem fibres are four elements of phloem.     The pholem of gymnosperm possess sieve tubes sieve tube elemments which are living and thin - walled. However, it lacks companion cells. This is the major difference between angiosperms and gymnosperms as companion cells are present in angiosperms but absent in...

Which of the statement given below is not true about formation of Annual Rings in tree?

 

  • Option 1)

    Annual rings is a combination of spring wood and autumn wood produced in a year.

     

  • Option 2)

    Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively

  • Option 3)

    Activity of cambium depends upon variation in climate

  • Option 4)

    Annual rings are not prominent in trees of temperate region.

     

  Annual ring - Annual rings are formed due to inequal activity of vascular cambium. In winter or autumn season, the activity of the cambium is less and cuts off small sized xylem elements (vessels) which constitute late wood or autumn wood. The vascular cambium is highly active in spring or summer and secondary xylem is formed. - wherein Cells are large with wide lumen. The wood is known as...
what do we mean by axolotl larva?
Axoltl larva is special kind of larvae of certain amphibians. These larvae are special as ther grow by neoteny
Mam can you please tell the arrangement of cilia flagella
Cilia and flagella both have 9+2arrangement, there are 9 pairs of peripheral microtubules and 2 unpired microtubules in the centre
Difference between haematoma and haematuria???
Difference between haematoma and haematuriaDifference between haematoma and haematuria
Radial symmetry is usually associated with (a) aquatic mode of life [(b) lower grade of organisation (c) creeping mode of locomotion (d) sedentary mode of life
@SUNIL correct answer is ....lower grade of organisation you can see the difference between the distribution, in the given figure.
Which one of the following categories of animals, is correctly described with no single exception in it? (a) All sponges are marine and have collared cells. (b) All mammals are viviparous and possess diaphragm for breathing. (c) All bony fishes have four pairs of gills and an operculum on each side. (d) All reptiles possess scales, have a three chambered heart and are cold blooded (poikilotherm
Which one of the following categories of animals, is correctly described with no single exception in it

@Nishanjali

 

Q. which stage of moss bear sex organ 

when they become mature, then they produce sex organs.
 

when they become mature, then they produce sex organs.
IMG_20190227_224820.jpg 1. State the location and function of different types of meristems. 2. Cork cambium forms tissues that form the cork. Do you agree with this statement? Explain.
@Aanchal Yes, cork cambium forms tissues that form cork. AS the stem continues to increase in girth anothermeristematic tissue called cork cambium or phellogen develops in cortex region of stem. The phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem.
IMG_20190227_105958.jpg A bacterial cell uncle! roe t Nventv nunutes. Starting with 61 nt!lc bactenurn how tuany bacteria will be at the end of 3 hours (d) 1024.
@Drmohamedashraf  Use formula  f = i  ,  where f is final number of bacteria, i is initial number of bacteria and n is number of generation To find number of generation divide total time to time taken for one division Number of generations= 180/20= 9 F= 1  = 512
In which cell organelle A carbon dioxide is released during photosynthesis you want for this question I didn't receive any answer and I check chat also
Answer to your other question is mitochondria
15507635551517757446803935601983.jpg
this question has been already answered.
IMG_20190220_142540.jpg Any formula for finding the answer for these questions???? Any formula for finding the answer for these questions????

50. A protozoan reproduces by binary fission. What
will be the number of protozoans in its
population after six generations ?
(a) 128
(c) 64
(b) 24
(d) 32
(NCERT Exemplar)
 

@Drmohamed ashraf see, when protozoan reproduce through binary fission, they results into two organisms. So, to find their total no in 6th generations, the calculation will be like..... starting no. will be 2 and it will be multiplied up to six times 6= 2x2x2x2x2x2=64 so the total no will be 64.
85F42B18-4A09-4233-8EB5-5704C90ABA19.jpeg O 8 o 8 o o 8 o 3 8
Clowes proposed that root apex consists of a quiescent centre having non dividing meristematic cells. Quiescent centre may function as reserve meristem. Due to the presence of it, root apex appears cup shaped. It has very low amounts of DNA, RNA and proteins. Resting meristem may resume division in case of tissue damage. Thus all statements are correct.
What is the unit of vegetative propagation in grasses?
@Swati swagatika senapati Different grasses may have runner, stolons or rhizomes as their units of vegetative propagation.
IMG_20190125_153552.jpg In which animal, nerve is present but brain is absent? (a) Sponge (b) Honeybee (c) Cockroach (d) Hydra
@Ashish shakya...... correct answer is hydra.... because, hydra has nerve cells but no brain. Its nervous system consists of nerve cells and their processes. Sensory cells are also present but the brain is absent. Sponges lack the nervous system. They do not have nerve cells. Earthworm and cockroach have a nervous system consisting of a circumcenter nerve ring and a solid, double, midventral...
Explain floral formula.
@JYOTIRADITYA PUJARI Floral formula represents the structure of a flower by using numbers, letters and various symbols, presenting substantial information about the flower in a compact form. In the floral formula, Br stands for bracteate K stands for calyx , C for corolla, P for perianth, A for androecium and G for Gynoecium, for superior ovary and  for inferior ovary,??for male,??for female,...
Exams
Articles
Questions