CBSE > Class 11 > Biology | CBSE Board | Homework Help

According to vernalisation, It is defined as the qualitative or quantitative dependence of plants on exposure to a low temperature to flower. a plant can be induced to flower in a growing season by exposing it to low temperature. Therefore, it shortens the vegetative phase and hastens flowering in plants.

0Thank You

ANSWER

Why ATP is called an energy currency

Posted by Suvi @213 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Yogita Ingle 4 years, 11 months ago

ATP is called the energy currency of the cell, and of life, because it is the energy molecule that all cells need in order to do anything within the human body. The molecule is used like a battery within cells and allows the consumption of one of its phosphorous molecules.

1Thank You

ANSWER

What is Cardiac cycle ?

Posted by Alok Singh 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Yogita Ingle 4 years, 10 months ago

The sequential event in the heart which is cyclically repeated is called the cardiac cycle and it consists of systole and diastole of both the atria and ventricles.
Duration of a cardiac cycle is 0.8 seconds.
During a cardiac cycle, each ventricle pumps out approximately 70 mL of blood which is called the stroke volume.

0Thank You

ANSWER

How the heartbeat is regulated in humans ?

Posted by Alok Singh 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Meghna Thapar 4 years, 4 months ago

Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate. The heartbeat is triggered by electrical impulses that travel down a special pathway through your heart: SA node (sinoatrial node) – known as the heart's natural pacemaker. The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node.

0Thank You

ANSWER

what is helix of dna and rna made up of????

Posted by Simmi Patel 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Meghna Thapar 4 years, 4 months ago

DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code. Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are polymers composed of monomers called nucleotides. An RNA nucleotide consists of a five-carbon sugar phosphate linked to one of four nucleic acid bases: guanine (G), cytosine (C), adenine (A) and uracil (U). Both DNA and RNA are made from nucleotides, each containing a five-carbon sugar backbone, a phosphate group, and a nitrogen base. DNA provides the code for the cell 's activities, while RNA converts that code into proteins to carry out cellular functions.

0Thank You

ANSWER

Can you suggest me a model of biology

Posted by Farkhanda Haider 4 years, 11 months ago

CBSE > Class 11 > Biology

0 answers

ANSWER

Bionomical nomenclature

Posted by Shaikh Sahil 4 years, 11 months ago

CBSE > Class 11 > Biology

2 answers

Tanveer Yaseen 4 years, 11 months ago

Binomial nomenclature deals with species and genus, genus start with capital letter and species start with small letter

0Thank You

Aleesha S 4 years, 11 months ago

the system of nomenclature in which two terms are used to denote a species of living organism, the first one indicating the genus and the second the specific epithet.

0Thank You

ANSWER

Give two name which has found 2 nucles in cell?

Posted by Punit Nagar 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Meghna Thapar 4 years, 2 months ago

The eukaryotic cell nucleus. Visible in this diagram are the ribosome-studded double membranes of the nuclear envelope, the DNA (as chromatin), and the nucleolus. Within the cell nucleus is a viscous liquid called nucleoplasm, similar to the cytoplasm found outside the nucleus. Liver cells often have two nuclei so they can more efficiently do all these jobs. Having two nuclei is like having two sets of blueprints, so the cells can build two proteins at the same time.

0Thank You

ANSWER

What is the difference between mitosis and meiosis

Posted by Sohail Siddqui 4 years, 11 months ago

CBSE > Class 11 > Biology

0 answers

ANSWER

PLANT cell and anila cell difesen

Posted by Lalit Choudhary 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Tanveer Yaseen 4 years, 10 months ago

Plant cell and animal cell both under go mitotic cell division. Their main difference is how they form the daughter cells during cytokinesis. During the stage , animal cells form furrow or cleavage that gives way to formation of daughter cells .Due to the exestience of rigid cell wall , plant cell don't form furrows

0Thank You

ANSWER

Draw and lebel the prothalus pf ferm

Posted by Priyangshu Pritom Hazarika 4 years, 11 months ago

CBSE > Class 11 > Biology

0 answers

ANSWER

What is Photocytosis

Posted by Hariom Yadav 4 years, 11 months ago

CBSE > Class 11 > Biology

2 answers

Jassi Midha 4 years, 11 months ago

Actually i don't read this chapter.but if we split the term photocytosis the meaning we get: 'photo' means'light' & 'cyto' means cytoplasm. When cytoplasm divde in presence of light.

0Thank You

Alok Singh 4 years, 11 months ago

Photocytosis is a process by which phagocytes engulf microorganisms and cellular materials.

1Thank You

ANSWER

Why transpiration is known as evil necessory

Posted by Sachin Yadav 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Yogita Ingle 4 years, 10 months ago

Transpiration occurs through the stomata. The stomata are primarily meant for absorption of CO₂but the water vapors also escape through stomata and cause transpiration. Thus transpiration is called as a necessary evil because it is an inevitable process. The loss of water can lead to wilting, serious desiccation, and shortage of water. Transpiration helps in the ascent of the sap and the pulling of the water from the roots to the tips. Thus is it considered to be a necessary evil.

0Thank You

ANSWER

What is Consciousness

Posted by Satyam Shaurya 4 years, 11 months ago

CBSE > Class 11 > Biology

2 answers

Shivi ?? 4 years, 11 months ago

Ability to sense

0Thank You

Rajkumar Rocky 4 years, 11 months ago

It means a ability to sense their surroundings.

0Thank You

ANSWER

Which mammal have nucleated RBC

Posted by Harsh Mann 4 years, 11 months ago

CBSE > Class 11 > Biology

3 answers

Varun Biban 4 years, 11 months ago

In simple words birds , reptiles , and other lower form of vertibrate

1Thank You

Rajkumar Rocky 4 years, 11 months ago

Camel

0Thank You

Sia ? 4 years, 11 months ago

The “camels have nucleated RBCs” story is just another stubborn myth. Like in all mammals, camel erythrocytes(RBCs) do have a nucleus and other organelles when first formed (in bone marrow), and in all mammals, these are ejected upon maturity (making more room for oxygen transporting hemoglobin).

1Thank You

ANSWER

What is euglena

Posted by Priyanshu Narayan 4 years, 11 months ago

CBSE > Class 11 > Biology

2 answers

Pawni Chaudhary 4 years, 11 months ago

Euglena is a microscopic protozoan that can be found in fresh water and salty environment

1Thank You

Mahatma Cbse 4 years, 11 months ago

Euglena is a microscopic protozoan that can be found in freshwater and saltwater environments. Euglena contain chloroplast which they can use to photosynthesize sugars. However, unlike algae, they can also ingest bacteria and small microbes for energy and nutrients

1Thank You

ANSWER

Way biology class

Posted by Lalit Choudhary 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Jasbir Midda 4 years, 11 months ago

I couldn't understand.???????

1Thank You

ANSWER

All vertebrates are chordates but all chordates are not vertebrates. Why? Give reason.

Posted by Rajkumar Rocky 4 years, 11 months ago

CBSE > Class 11 > Biology

3 answers

Rajkumar Rocky 4 years, 11 months ago

Thanks to my friend

4Thank You

Tannu Sharma 4 years, 11 months ago

In adults the notochord is replaced by vertebral column during embryonic stage so,all vertebrates are chordates but all chordates are not vertebrates.

4Thank You

Aditya Narayan Singh 4 years, 11 months ago

View ncert solution from this app ?

0Thank You

ANSWER

Define term aestivation

Posted by Mohammad Kaif 4 years, 11 months ago

CBSE > Class 11 > Biology

3 answers

Somya Mehta 4 years, 11 months ago

There are four types of aestivation first valvate 2nd twisted 3rd imbricate and 4th vexillary. valvate is found in calotropis twisted is found in lady finger imbricate is found in guava and Gulmohar and vexillary aestivation is found in pea

0Thank You

Aditya Narayan Singh 4 years, 11 months ago

The arrangement of calyx and Corolla on flowet axis

1Thank You

Rajkumar Rocky 4 years, 11 months ago

It is a arrangements of petals and sepals on flower axis, that is called aestivation.

2Thank You

ANSWER

What then would be the maximum concentration of alcohol in beverages that are naturally fermented?

Posted by Shereen Nasreen 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Yogita Ingle 4 years, 10 months ago

Maximum concentration of alcohol in naturally fermented beverages is 15-16%.

Higher level of alcohol (above 16%) is toxic to the yeast hence alcoholic concentration greater than this limit is achieved by fortifying the solution by adding more concentrated alcohol or by distillation.

0Thank You

ANSWER

What makes a reptiles a reptiles??

Posted by Riya Trivedi 4 years, 11 months ago

CBSE > Class 11 > Biology

0 answers

ANSWER

Describe the mechanism of inspiration and expiration

Posted by Priyashree Paul 4 years, 11 months ago

CBSE > Class 11 > Biology

3 answers

Tanveer Yaseen 4 years, 11 months ago

The inhalation of air is called inspiration .. the exhalation of air is called exhalation

0Thank You

Somya Mehta 4 years, 11 months ago

The mechanism of expiration or exhalation is of the ribs and diaphragm relaxes thus the volume of the thoracic cavity decreases the pressure increases the air is exhaled out

0Thank You

Somya Mehta 4 years, 11 months ago

The mechanism of inspiration aur inhalation is of the ribs and diaphragm contracts the volume of the thoracic cavity increases does the pressure decreases and the air is inhaled

0Thank You

ANSWER

All are students or some are teachers !????????

Posted by Tannu Tannu 4 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Tannu Tannu 4 years, 8 months ago

???

0Thank You

ANSWER

In cockroach, which part store food

Posted by Varun Biban 4 years, 11 months ago

CBSE > Class 11 > Biology

6 answers

Tanveer Yaseen 4 years, 11 months ago

Crop

0Thank You

Aleesha S 4 years, 11 months ago

Crop

1Thank You

Aditya Narayan Singh 4 years, 11 months ago

CROP

1Thank You

Purvi Diwakar 4 years, 11 months ago

Crop

1Thank You

Jassi Midha 4 years, 11 months ago

Crop.

2Thank You

Seema Chawla 4 years, 11 months ago

In a cockroach , the oesophagus opens into a sac-like structure called the crop that stores food .

1Thank You

ANSWER

Taxonomy means

Posted by Tushar Garule 4 years, 11 months ago

CBSE > Class 11 > Biology

4 answers

Sia ? 4 years, 11 months ago

Taxonomy is a branch of biology which deals with identification, nomenclature and classification of organisms.

2Thank You

Tanveer Yaseen 4 years, 11 months ago

It deals with nomenclature, classification of organisms and identification

0Thank You

Aditya Narayan Singh 4 years, 11 months ago

✅?✅

0Thank You

Varun Biban 4 years, 11 months ago

Taxonomy is the process of naming and classifying things such as animal and plants into groups within the larger system, according to their similarties and difference

2Thank You

ANSWER

What is the difference between bisexual and hermaphrodite? At least three points.

Posted by Saumya Singh 4 years, 11 months ago

CBSE > Class 11 > Biology

0 answers

ANSWER

What are the characteristics of prokaryotic cells?

Posted by Neetu Mukesh 4 years, 11 months ago

CBSE > Class 11 > Biology

6 answers

Hariom Yadav 4 years, 11 months ago

Small in size 1.10new Nucleus absent Single chromosome Cell organelles absent

0Thank You

Samreen Amreen 4 years, 11 months ago

prokaryotic cells are representd by blue-green algae and so many .they are small in size

1Thank You

Somya Mehta 4 years, 11 months ago

Prokaryotic cells are those cells in which membrane bound are absent DNA is not associated with the histone protein cytoskeleton is absent nitrogen fixation is present nuclear membrane and nucleolus are absent for example bacteria

1Thank You

Aditya Narayan Singh 4 years, 11 months ago

Search on google you will get all points

1Thank You

Jassi Midha 4 years, 11 months ago

Prokaryotic cells have not well defined nucleus and cell organelles. Prokaryotic cells DNA found in Central part of the cell called nucleoid.

1Thank You

Jassi Midha 4 years, 11 months ago

Prokaryotic cells haven't well defined nucleus and cell membrane.

0Thank You

ANSWER

What are the characteristics of prokaryotic cells?

Posted by Neetu Mukesh 4 years, 11 months ago

CBSE > Class 11 > Biology

2 answers

Tiyasha . 4 years, 11 months ago

Prokaryotic cells have different characteristic features. The characteristics of the prokaryotic cells are mentioned below. *They lack a nuclear membrane. * Mitochondria, Golgi bodies, chloroplast, and lysosomes are absent. * The genetic material is present on a single chromosome. * The histone proteins, the important constituents of eukaryotic chromosomes, are lacking in them. * The cell wall is made up of carbohydrates and amino acids. * The plasma membrane acts as the mitochondrial membrane carrying respiratory enzymes. * They divide asexually by binary fission. The sexual mode of reproduction involves recombination.

0Thank You

Chandrakanta Bhoi 4 years, 11 months ago

No neuclear mambrane present

0Thank You

ANSWER