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The following table shows solutions X, Y and Z with their respective pH values.
$\begin{array}{cccc}Solution& X& Y& Z\\ pH& 3& 7& 12\end{array}$
Based on the given information which of the following statement is false?

Name any two methods of birth control and mention the advantages and disadvantages of each. [5 MARKS]

Complete the given reaction:

$3O_2$ $\stackrel{uvrays}{\rightleftharpoons }?$

Threshold potential is a state of depolarisation at which _____.

The length of small intestine in a human adult is about:
(A) 4.5 m

(B) 1.5 m

(C) 3.5 m

(D) 6.5 m

Question 1 (e)
Fill in the blanks:
(e) Amoeba digests its food in the __.

Question 16

Which of the following is a recently originated problem of environment?



(a) Ozone layer depletion

(b) Greenhouse effect

(c) Global warming

(d) All of the above

How does the morphology of the leaf relate to its anatomy in dicots and monocots?

How did some plants can grow in absence of sunlight.? Such as money plant. Did they do photosynthesis.?

Ebola is transmitted by which of these following animals?

Match the following.

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{i. Troponin}& \text{a. Blocks the attachment site for the myosin cross bridge}\\ \text{ii. Tropomyosin}& \text{b. Has a myosin binding site}\\ \text{iii. Actin}& \text{c. Complex of 3 polypeptide units}\end{array}$

Volcanic eruptions can kill living organisms on a large scale because of the _________ that come out from Earth's core.

What is diploid number of chromosomes in onion?

Under which of the following conditions would a person have higher-than-normal count of RBCs in his blood?

The major sources of soil pollution are:-

Which of the following is not an endangered species?

Double helical model of DNA was inferred based on the technique of _____.

The following sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.

S1: The Hound of Baskervilles was feared by the people of the area.
P: Some people spoke of seeing a huge, shadowy form of a Hound at midnight on the moor.
Q: But they spoke of it in tones of horror.
R: Nobody had actually seen the hound.
S: This shadowy form did not reveal any details about the animal.

S6: The Hound of Baskervilles remains an unsolved mystery.

The proper sequence should be:

Frog emulsifies fat with the help of:

Why do birds have wings?

Duplication of DNA occurs in ________ stage of a cell.

The number of chromosomes in human being is:

Define excretion. Name the excretory unit of a kidney.

Gestation period in humans lasts for

Green glands are excretory structures found in_________

According to fossil discovered up to present time, the origin and evolution of man started from _______ .

What percentage of progeny carry recessive traits in the $F_2$ generation of a typical monohybrid cross conducted by Mendel if the parents are pure lines for the character considered?

Question 18
Which among the following statements are true about sexual reproduction in the flowering plants?