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How many number of cranial and spinal nerves are present in man?

Phenotype of an organism is the result of :

During metaphase of mitosis, chromosomes:

What are the functions of labeled parts [1 and 2] in the diagram?

If there is a difference in electrical charge between the outside and inside of the membrane, the neuron is ___

The three main parts of the nails are:

Relaxation of the ciliary muscles causes the focal length of the eye lens to ________

What does each violet colored box represent?

What is the process of exchange of genes between homologous chromosomes called?

Match the reasons given in column 2 to the features of cacti in column 1.

$\begin{array}{cc}Featureofcacti& Reasons\\ a.\text{Spiny leaves}& \left(i\right)\text{Absorbing water from depths of soil}\\ b.\text{Thick, round fleshy stems}& \left(ii\right)\text{Prevent loss of water by transpiration}\\ c.\text{Deep roots}& \left(iii\right)\text{Store water}\\ d.\text{Closed stomata during the day}& \left(iv\right)\text{Prevent animals from eating the cactus}\\ e.\text{Carbon dioxide storage during the night}& \end{array}$

Choose the correct option that matches correctly. There can be multiple matches.

In which organism's body the concentration of DDT will be highest?

बिस्मिल्ला
खाँ
के
जीवन
से
जुड़ी
उन
घटनाओं
और
व्यक्तियों
का
उल्लेख
करें
जिन्होंने
उनकी
संगीत
साधना
को
समृद्ध
किया?

Animals like cows can digest cellulose, but humans cannot. Give reasons.

Name the arteries which supply blood to heart.

Fallopian tube in female reproductive system helps in ________.

Which product is initially formed during photosynthesis?

In which stage of the cell cycle, the cell are
metabolically active but no longer proliferates?

Cerebellum, medulla and pons are the parts of :

(a) midbrain

(b) hindbrain

(c) forebrain

(d) spinal cord

Identify A.

With the help of suitable diagram describe the structure of neuron.

Appearance of recessive characters in F2 generation is due to ………………………

Which of the following plants will not have transpiration?

Name any two ductless glands and mention their function.

Which of the following statements are true?

(i) Sudden reaction in response to the stimulus is called reflex action.

(ii) Sensory neurons carry signals from the spinal cord to muscles.

(iii) Motor neurons carry signals from receptors to spinal cord.

(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.

What is the green pigment present in the leaves?

Three copies of chromosome – 21 in a child with down’s syndrome have been analysed using molecular biology technology to detect any possible DNA polymorphism with reference to different alleles located on chromosome – 21. Results showed that out of 3 copies 2 of the chromosomes of the child contain the same alleles as one of the mother’s alleles. Based on this, when did the non – disjunction event most likely occur?

Which of the following is a wrong match?

Why can't we dispose off the nuclear waste on moon

Pure-bred round -yellow pea seeds have genotype RRYY and the pure-bred wrinkled-green pea seeds have genotype rryy. Keeping this in mind, write the phenotypes of the following genotypes of hybrid pea seeds.

(a) Rryy (b) rrYy (c) rrYY (d) RrYy (e) RRyy

Briefly explain how the rate of transpiration is affected by

(a) Intensity of light

(b) Humidity of the atmosphere.

Question 22

During adolescence, several changes occur in the human body. Mark one change associated with sexual maturation in boys



(a) loss of milk teeth

(b) increase in height

(c) cracking of voice

(d) weight gain