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How can soil erosion be prevented? [3 MARKS]

Plant breeding aims to produce:

Why are lysosome is known as suicide bags?

The messages carried by a neuron is called:

Chyme contains which of the following?

Why we can't see gamma rays ?

Question 3
Match the items in Column I with those in Column II:
$\begin{array}{cc}ColumnI& ColumnII\\ \left(i\right)Ahomeforlivingorganisms& \left(a\right)Largeparticles\\ \left(ii\right)Upperlayerofthesoil& \left(b\right)Allkindsofsoil\\ \left(iii\right)Sandysoil& \left(c\right)Darkincolor\\ \left(iv\right)Middlelayerofthesoil& \left(d\right)Smallparticlesandpackedtight\\ \left(v\right)Clayeysoil& \left(e\right)Lesseramountofhumus\end{array}$

We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino
acids, fatty acids, glycerol etc. What mechanisms are involved in absorption of digested food and water?
Explain why when a person takes a concentrated solution of salt, after some time, he starts vomiting.
What is the phenomenon responsible for such situation? [5 MARKS]

The concentration of chemical food contaminants is higher in birds of prey than in many of the individual organisms that they eat. Which of the following statement(s) best explain the reason for the higher concentration of food contaminants in birds of prey?

Dry indehiscent single seeded fruit formed from bicarpellary syncarpous inferior ovary is

Which is the organelle involved in cellular respiration?

A component 'X' in gastric juice helps to kill the germs in the food. Which among the following is 'X'?

People who have no melanin pigment and have white skin are called:

What's hypertonic solution??????

1. It is very easy to acquire bad habits, such as eating too many sweets, or consuming alcohol.
A. In case of addicts of drinks, alcohol is not at all necessary in any way to anybody.
B. The more we do a thing, the more we tend to like doing it.
C. Millions of people do without it.
D. This is called the 'force of habit.' 6. In view of the disadvantages, total prohibition is enforced in some states.

ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.

What is the basic principle on which plant tissues are categorise as meristematic and permanent tissues?

Photosynthesis can be described in terms of matter and energy. Which of the following options best describes the transformations of matter and energy in photosynthesis?

Statement 1: Epithelial tissue is flat, cuboidal and columnar in shape.

Statement 2: Blood and lymph are supportive connective tissue.

Choose the correct option.

Making new containers from crushed glass helps to

I AM HAVING A DOUBT REGARDING THE FULL FORM OF {ICBN}!

is it international code for botanical nomenclature {NCERT}

or

it is international code of botanical nomenclature

WHICH IS CORRECT?

Question 8
Which of the following types of muscle are involuntary?
(i) Striated muscle
(ii) Smooth muscle
(iii) Cardiac muscle
(iv) Skeletal muscle

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Which of the following devices used for filtering polluted air?

Anaerobic respiration in muscles gives rise to

The size of carbon nano tube is $25\times {10}^{-9}m$ and the size of bacterial cell is $5\mu m$. Find the ratio of size of bacterial cell to carbon nano tube. Given $1\mu m={10}^{-6}m$ [3 MARKS]

A kidney stone is

Which of the following genetic diseases results from a mutation that prevents protein dystrophin from forming?

An ischemic injury to the heart that destroys myocardial cells is

Involuntary muscle fibres lack this complex, required in the control of contraction of voluntary muscle fibres. Which of the following is this?

Birds have pneumatic bones which help in flying. Pneumatic bone means

If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation :

(a) How did the mould get inside the bell - jar?

(b) What would happen if the bread was not covered by the bell - jar?

(c) What would happen if moist bread was placed in a refrigerator?

(d) What appears first on the bread-the mycelia or the spores?

(e) How does bread mould obtain nourish-ment? What type of nourishment is it - epiphytic, autotrophic, parasitic symbiotic, or saprophytic?

All veins carrying deoxygenated blood combine into a single vein called_____.

Bony fishes are:

Classify the following organisms into their respective kingdoms as per Whittaker's five-kingdom system:

mushroom, herbs, amoeba, E.coli, euglena, mold, birds, insects, bushes, streptococcus. [5 MARKS]

Proteins are essential for

Rearrange the following parts of a nephron in the order in which fluid flows through the nephron.

List a few diseases that are caused by a virus. [3 MARKS]

Which of these nutrients is the preferred energy source for the body?

Answer the following: [3 MARKS]

(1) When does a person need artificial respiration?
(2) From where can a person get the supply of oxygen for artificial respiration?
(3) Is artificial respiration needed temporarily or permanently?

What will happen if a de-shelled egg in a concentrated salt solution for 5 minutes?