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Define plastids. Class 11

Posted by Surya Narayanan 2 years, 1 month ago

CBSE > Class 11 > Biology

1 answers

Arpita Yadav 2 years, 1 month ago

The plastids are double-membrane organelles which are found in the cells of plants and algae.

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Would a defoliated plant respond to photoperiodic cycle ?Why?

Posted by Kamal Patni 2 years, 1 month ago

CBSE > Class 11 > Biology

1 answers

Janhavi Singh 2 years, 1 month ago

The photoperiodic stimulus is picked up only by the leaves in plants. For this purpose, leaf is of utmost importance. For the perception of photoperiodic cycle, presence of leaves under inductive photoperiod is essential, so that, the hormone required for flowering can be produced. Therefore, in the absence of leaves, i.e, in a defoliated plant light perception would not occur, i.e., the plant would not respond to light.

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What is meant by vertebrata

Posted by Archana Magar 2 years, 1 month ago

CBSE > Class 11 > Biology

3 answers

Kirthika Prabakaran 2 years, 1 month ago

Animals which are having Vertebral coloum (back bone ) those animals are called Vertebrates. I hope it will be helpfull

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Anshika Pandey 2 years, 1 month ago

subphylum of chordates comprising animals (as mammals, birds, reptiles, amphibians, and fishes)

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Sharvari Dalvi 2 years, 1 month ago

An animal that has a backbone and a skeleton

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Case based

Posted by Mohammed Suleman Khan 2 years, 1 month ago

CBSE > Class 11 > Biology

0 answers

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Explain metamerism in earthworm for 2 marks

Posted by Nancy 🙂✨ 2 years, 1 month ago

CBSE > Class 11 > Biology

1 answers

Janhavi Singh 2 years, 1 month ago

Metamerism is a body type exhibited by members of the phylum Annelida. It means that the body is composed of repeating segments attached to make a whole. These segments are known as metameres, and the lines we see externally separating each segment are called annuli. Metamerism is easily visible in earthworms.

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Chapter principal of inheritance and variation

Posted by Sudiksha Thakre 2 years, 1 month ago

CBSE > Class 11 > Biology

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A taxon is

Posted by Karuna . 2 years, 1 month ago

CBSE > Class 11 > Biology

1 answers

Anjan Karthi 2 years, 1 month ago

Any taxonomic level in hierarchical system of taxonomic classification is called a taxon. Coined by Linnaeus. There are mainly 7 taxa - Species, Genus, Family, Order, Class, Division/Phylum, Kingdom.

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What is lumen? ( class 11 , chapter: cell the unit of life)

Posted by Shamaila __ 2 years, 1 month ago

CBSE > Class 11 > Biology

2 answers

Anjan Karthi 2 years, 1 month ago

Well, the definition you gave is correct, but on a broader or general basis, it is intercellular (or sometimes intra) space or volume which is actually or appears to be enclosed by a group of cells (in the case of tissues like sclereids and fibres) or by any membrane within the cell (just as in the case you mentioned).

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Nancy 🙂✨ 2 years, 1 month ago

A lumen is a space that is formed by the membrane of the thylakoids

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Write a note on ascomycetes

Posted by Mahesh C 2 years, 1 month ago

CBSE > Class 11 > Biology

1 answers

Nancy 🙂✨ 2 years, 1 month ago

Ascomycetes typically refer to fungus whose spores develop within the cylindrical sacs named asci. They are also called sac fungi. They do have chitinous cell walls. They are unicellular such as yeast but most of the members of these groups have well-developed, profusely branched

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Transmembrane protein present on

Posted by Shaikh Fatema 2 years, 2 months ago

CBSE > Class 11 > Biology

2 answers

Kirthika Prabakaran 2 years, 1 month ago

Transmembrane proteins present on Phospholipid bilayer . I hope it will be helpful for you

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Roshni Gupta 2 years, 2 months ago

the bilayer by lipid groups,

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Coronary artery

Posted by Rajvi Paunikar 2 years, 2 months ago

CBSE > Class 11 > Biology

2 answers

Anjan Karthi 2 years, 1 month ago

Coronary artery is the one that supplies oxygenated blood from heart to the coronary capillary network, which supplies blood to the cardiac musculature.

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Mohd Hamza 2 years, 2 months ago

What is polythene chromosome

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Explain micturition....

Posted by Chinki 🦋👈🏻 2 years, 2 months ago

CBSE > Class 11 > Biology

2 answers

Chinki 🦋👈🏻 2 years, 1 month ago

Tqsm....!!

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Anjan Karthi 2 years, 2 months ago

Micturition is the process of expulsion of the final selectively secreted and processed filtrate (commonly known as Urine) from the body through the Urethra. Before micturition, urine is held in an elastic muscular bag like structure called urinary bladder connecting the ureters from kidneys to the urethra. They contain stretch receptors that are in turn associated with certain osmoregulatory regions in the brain. When the urinary bladder is filled with urine, stretch receptors send signals to brain that urine must be expelled so as to accommodate the urine that is coming from kidneys (Urine production is a continuous process). Thus, the brain signals the urethral and bladder muscles to help the bladder remove the urine stored (about 1-1.5 L a day).

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Cell division

Posted by Jayveer Dadheech 2 years, 2 months ago

CBSE > Class 11 > Biology

1 answers

Anup Kumar Gupta 2 years, 2 months ago

Cell division is a type of division in which "cells are seprate their nucleus and cell body in two or more than two parts".

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Describe morphological characteristics of frog

Posted by Jasmeen Khubber 2 years, 2 months ago

CBSE > Class 11 > Biology

2 answers

Rafi Mohammed 2 years, 2 months ago

It is amphibian animal, body is dorsal Divide body into head and trunk it can change colour eye is large and bulging, tympannum is present.

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Naincy Thakur 2 years, 2 months ago

:- It is warm blooded animal :- Skin of frog is smooth and slippery due to presence of mucus . ;- Body is divided into head and trunk :- tympannum membrane is present instead of external ears for receiving sound signal :- the frog never drinks water ,it' absorbs through it skin

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What are heterospory what is its significance

Posted by Ujala Yadav 2 years, 2 months ago

CBSE > Class 11 > Biology

2 answers

Anshu Vasu 2 years, 1 month ago

Heterospore is the phenomenon of two kinds of species. The small spores arw known as microspores and the large spores are known as megaspores Significance= The biological significance of Hetrosphyte during spores formation

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Jasmeen Khubber 2 years, 2 months ago

The presence of two kinds of spores in any plant body is known as heterospory. i.e, Male microspores and female megaspores Significance = It is the first step towards seed habit.

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What is flagellar movement

Posted by R Singh 2 years, 2 months ago

CBSE > Class 11 > Biology

1 answers

Subhash Chandra 2 years, 2 months ago

Bodd

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Difference between prokaryotic and eukaryotic cell

Posted by Sujal Chougule 2 years, 3 months ago

CBSE > Class 11 > Biology

2 answers

Hira Ansari 2 years, 2 months ago

Prokaryotic cells have not well developed organelle other than ribosome while eukaryotic have well developed organelle including ribosome,nucleus,nuclear membrane etc

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Anjan Karthi 2 years, 3 months ago

A prokaryotic cells represent the earlier forms of life that existed on earth and they have no distinct cell nucleus or membranes bound cell organelles. They have a severely indistinct nucleoid region of condensed chromatin network and smaller 70S ribosomes (with 30S and 50S subunits) with special bodies replacing cell organelles such as the inclusion bodies, chromatophores and mesosomes. On the other hand, eukaryotic cells have a much more complex organization with proper membrane-bound cell organelles and larger 80S ribosomes (with 40S and 60S subunits).

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Explain how the difference in the pressure of the blood in pulmonary artery and the aorta is related to (I) structure of the ventricles. (II)Where the blood is going.

Posted by Siddhi Gupta 2 years, 3 months ago

CBSE > Class 11 > Biology

2 answers

Anjan Karthi 2 years, 3 months ago

Hope you understood the whole thing.

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Anjan Karthi 2 years, 3 months ago

Ventricles usually have very thick walls so that they can withstand the pressure with which they have to pump blood so that blood circulates through each and every tissue of the body. But, left ventricle is the one that actually sends the blood to most body tissues, so the LV is the thickest due to which aorta has to withstand higher pressure. But, RV does not need that much pressure or thickness as it has to pump blood only to the lungs. So, the pulmonary artery also experiences relatively lower pressure than aorta. So, considering (1), thicker the ventricular wall, more would be the pressure it's associated artery has to withstand. Considering (2), more the number of tissues to which blood must reach and more the distance the blood must travel to reach tissues, greater will be the pressure on the great arteries. (GREAT ARTERIES IS THE COLLECTIVE TERM FOR AORTA AND PULMONARY ARTERY)

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Describe the event of cardiac cycle

Posted by An Kharz 2 years, 3 months ago

CBSE > Class 11 > Biology

1 answers

Nandhanaa Tamilarasan 2 years, 3 months ago

The cardiac cycle is a series of pressure changes that take place within the heart. These pressure changes result in the movement of blood through different chambers of the heart and the body as a whole.

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Cell is unicellular organism

Posted by Sandhya Behera 2 years, 3 months ago

CBSE > Class 11 > Biology

3 answers

Neha Future Dr. 2 years, 3 months ago

Cell is unicellular but not an organism..

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Devadathan Vishnu 2 years, 3 months ago

Cell is a unicellular entity. It makes an organism. It's not an organism.

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Smriti Srivastava 2 years, 3 months ago

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Why hemichordata are placed in invertebrates?

Posted by Arpita Nayak 2 years, 3 months ago

CBSE > Class 11 > Biology

1 answers

Devadathan Vishnu 2 years, 3 months ago

Hemicordata don't have a complete and true notochord. Notochord is an important criterion for class chordata/vertebrates

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name the Phylum having largest number of animals . name are major category of animals it. has write any two special morphology features of animals of this phylum

Posted by Prachi Gotiya 2 years, 3 months ago

CBSE > Class 11 > Biology

5 answers

Shaikh Fatema 2 years, 2 months ago

Phyllum arthropoda

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Anjan Karthi 2 years, 3 months ago

And, categories inside include Crustaceans (Prawns, shrimps), Insects (Cockroach, ants) , Arachnids (Spider, Scorpion), and Limulus (King Crab, the sole member in the category) .

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Neha Future Dr. 2 years, 3 months ago

Arthropoda

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Devadathan Vishnu 2 years, 3 months ago

Phylum Artropoda Features : Jointed appendages Presence of malphigian tubules

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Shreya Maurya 2 years, 3 months ago

Phylum Arthropoda

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Why is two kingdom classification was found to be insufficient

Posted by Suresh Chandra Yadav 2 years, 4 months ago

CBSE > Class 11 > Biology

2 answers

Neha Future Dr. 2 years, 3 months ago

Because it can't distinguish between 1. Eukaryotes and prokaryotes 2. Unicellular and multicellular 3. Autotrophs and heterotrophs 4. Many organisms are not included in two kingdom classification

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Ashiya Banu 2 years, 4 months ago

Becausw it cannot differentiate between 1)unicellular and multicelluar ,2)prokaryotes and eukaryotes (3) autotrophs and hetrotrophs

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Is two kingdom.classification adaquate give example

Posted by Anu Mahto 2 years, 4 months ago

CBSE > Class 11 > Biology

2 answers

Raj Kumar Raj Purohit 2 years, 4 months ago

Heilo

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Anjan Karthi 2 years, 4 months ago

No. It does not differentiate between prokaryotic and eukaryotic, photosynthetic and non-photosynthetic and unicellular and multicellular organisms. For example, cyanobacteria and algae are placed under Kingdom plantae and Amoeba and fishes are placed under Kingdom Animalia.

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Monsoon floods and hollowness of the authorities

Posted by Simran Saini 2 years, 4 months ago

CBSE > Class 11 > Biology

2 answers

Raj Kumar Raj Purohit 2 years, 4 months ago

Hii

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Sushil Monu 2 years, 4 months ago

Hii

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What are characters of life

Posted by Kartik Waddar 2 years, 4 months ago

CBSE > Class 11 > Biology

1 answers

Suraj Verma 2 years, 4 months ago

Must show internal growth Must have cellular metabolism Able to show consciouness Able to regulate their body temperature Able to show respond towards stimulus These are some important characters of life

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Morphology of flowering plants questions

Posted by Lucky Sugali 2 years, 4 months ago

CBSE > Class 11 > Biology

2 answers

Shaikh Fatema 2 years, 2 months ago

You can get it easily from telegram channel biology at ease or rakshita singh

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Nandhanaa Tamilarasan 2 years, 3 months ago

How do the roots of the plants growing in swamps and marshes obtain their oxygen? A.1. The roots of the plants growing in swamps and marshes grow vertically upwards and respire. They become negatively geotropic. Q.2. Name some modifications of plant parts for the purpose of photosynthesis. A.2. The stem gets modified into a leaf-like structure to carry out photosynthesis. In plants like Trapa and Tinospora, the roots grow out of the soil and develop chlorophyll to perform photosynthesis. Q.3. What are the edible parts of ginger and onion? A.3. The modified stem is the edible part of ginger. All the food material is stored here. The fleshy leaves of onion are the edible parts. Q.4. Differentiate between pinnately compound leaf and palmately compound leaf? A.4. Pinnately Compound LeafPalmately Compound LeafThe midrib of the leaves is present on a common axis called the rachis.Leaflets are attached at the tip of the petiole. Q.5. Explain different types of phyllotaxy with suitable examples. A.5. The pattern in which the leaves are arranged on the stem is known as phyllotaxy. These are of three types: Alternate Phyllotaxy- The leaf arises from each node in an alternate manner. For eg., China rose, sunflower. Opposite Phyllotaxy- The leaves arising at each node lie opposite to each other. For eg., Calotropis Whorled Phyllotaxy– More than two leaves arise at each node and form a whorl. For eg., Alstonia Q.6. Describe the modifications of the stem. Give examples for the same. A.6. Modifications of the stem are as follows: Stem Tendrils- These may be branched with scaly leaves. Eg., Passiflora, Antogonon Stem Thorns- These are sharp needle-like structures that are formed to reduce transpiration and also act as a defence. For eg., Citrus, Pomegranate Phylloclades- These are green, flattened, succulent, leaf-shaped structures that perform photosynthesis. They possess indefinite growth. For eg., Opuntia, Euphorbia soyleana. Cladodes- They are green, photosynthetic of limited growth. The leaves are either modified into spines or reduced to scales. For eg., Ruscus, Asparagus Q.7. Which two roots develop from different parts of the angiosperm plant other than the radicle? A.7. Prop roots of the banyan tree- Develop from lower nodes of the stem of the tree Stilt roots in sugarcane- Arise from lower nodes of the stem and penetrate the soil. Both the roots are meant to provide support.

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Plants kingdom

Posted by Urvashi Pandey 2 years, 4 months ago

CBSE > Class 11 > Biology

0 answers

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What is fungi?

Posted by Harpreet Kaur 2 years, 4 months ago

CBSE > Class 11 > Biology

1 answers

Ishu Rana 2 years, 4 months ago

fungus (pl: fungi[2] or funguses[3]) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom,[4] separately from the other eukaryotic kingdoms, which, by one traditional classification, includes Plantae, Animalia, Protozoa, and Chromista.

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Which class of Kingdom Fungi is commonly known as "Imperfect fungi' & wh

Posted by Ritam Mondal 2 years, 4 months ago

CBSE > Class 11 > Biology