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Which disease is caused in human being due to depletion of ozone layer in the atmosphere?

Name the region of the alimentary canal which receives secretions from the different accessory glands?

Give one reason why multicellular organisms require special organs for exchange of gases between their body and their environment .

Question 04(viii)
Indicate whether the following statements are True (T) or False (F).
Binary fission is a method of asexual reproduction. ( )

The stomatal pore opens when:

Stomata of desert plants remain closed during day time. How do they take up carbon dioxide and perform photosynthesis?

Identify the gland in the picture. What happens if its secretion is beyond required level in the body?

Which raw material is responsible for the release of molecular oxygen in photosynthesis ?

The hormones vasopressin (ADH) and oxytocin are released by

Mention two functions of animal husbandry and two uses of cattle farming. [2 MARKS]

Match Column I With Column II and select the correct answer using the codes given below the columns.

$\begin{array}{cc}Column-I\left(Diseases\right)& Colum-II\left(Cause\right)\\ A.Smallpox& P.Bacteria\\ B.Cholera& Q.Virus\\ C.Malaria& R.Deficiencyofminerals\\ D.Anaemia& S.Femalemosquito\end{array}$

What causes extinctions?

Question 8 (i)
Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction – upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.


(i) The air tubes of insects

Leakage channels are regulated by _________.

A homozygous purple flower variety of pea plant [PP] is crossed with a white flower variety of pea[pp]. Answer the following questions by using Punnett square:-
i) Mention the phenotype and genotype of the F1 and generation offsprings.
ii) If the offsprings of the F1 and generation are crossed, what will be the phenotypic ratio and genotypic ratios of the F2 generation?
iii) State Mendel's Law of dominance.
​​​​​​iv) What is the scientific name of the pea plant?
v) Name two genetic diseases in humans

The diagram below illustrates the change that occurred in the frequency of phenotypes in an insect population over 10 generations. A probable explanation for this change would be that over time there was…….

Study the diagram given below and then answer the questions that follow :

(a) Name the cells of the pancreas that produce (1) glucagon (2) insulin.

(b) State the main function of (1) glucagon and (2) insulin.

(c) Why is the pancreas referred to as an exo-endocrine gland ?

(d) Why is insulin not given orally but is injected into the body ?

(e) What is the technical term for the cells of the pancreas that produce endocrine hormones ?

(f) Where in the body is the pancreas located ?

What are the uses of antibiotics and vitamin $B_{12}$?

Roquefort cheese is ripened by using a

Fungi use __ mode of nutrition.

Select the list of greenhouse gases mentioned in descending order of their abundance.

‘Dup’ sound is produced during the closure of

Expulsion of undigested waste material through anus is known as ___ .

Functional megaspore in an angiosperm develops into:

The trachea divides into two tubes at its lower end. What is the name of these tubes ?